TAKEDA Hiroaki(Material Science Division)｜Saitama University Researcher List

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Author

Position

Affiliation

Research Areas

TAKEDA　Hiroaki
Material Science Division Professor
Department of Applied Chemistry

Home Page:
http://www.apc.saitama-u.ac.jp/

Researcher information

■ Degree

(BLANK), Tohoku University

■ Research Keyword

Inorganic Materials

Crystal Chemistry

■ Field Of Study

Nanotechnology/Materials, Inorganic compounds/materials chemistry

Nanotechnology/Materials, Inorganic materials

Nanotechnology/Materials, Applied materials

■ Research Seeds

Development of new piezoelectric crystals for high temperature application

Crystal growth of Li-ion conductor materials

Synthesis of Pb-free PTC thermistor ceramics with high Tc

Fabrication of ceramics by cold sintering process

Crystal growth of functional oxide materials by Czochralski method

■ Career

Apr. 2020 - Present, Saitama University, Graduate School of Science and Engineering, Professor

Apr. 2016 - Mar. 2020, Tokyo Institute of Technology, School of Materials and Chemical Technology

Apr. 2016 - Dec. 2017

Jul. 2008 - Mar. 2016, Tokyo Institute of Technology

Apr. 2007 - Jun. 2008, Nara Institute of Science and Technology, Graduate School of Materials Science

Jun. 2007 - Dec. 2007

Apr. 2000 - Mar. 2007, Nara Institute of Science and Technology, Graduate School of Materials Science

May 1999 - Mar. 2000, Tokyo Medical and Dental University, Institute of Biomaterials and Bioengineering

Apr. 1998 - Mar. 1999, Tohoku University, Institute for Materials Research

■ Educational Background

Apr. 1995 - Mar. 1998, Japan

Apr. 1992 - Mar. 1995, Kanazawa University, Japan

Apr. 1988 - Mar. 1992, Kanazawa University, Faculty of Science

■ Member History

Dec. 2019 - Present

May 2015 - Present
Society

Apr. 2007 - Present
Society

Jun. 2019 - May 2020
Society

Apr. 2000 - Mar. 2020
Society

■ Award

Jun. 2025, 学術賞

Mar. 2025, Japanese Journal of Applied Physics: 2024 Outstanding Reviewer Awards, IOP publishing
Hiroaki Takeda

Apr. 2022, Japanese Journal of Applied Physics: 2021 Outstanding Reviewer Awards, IOP publishing
Hiroaki Takeda

Jun. 2021, 学術賞

Oct. 2015, Richard M. Fulrath賞

Oct. 2005, 第25回エレクトロセラミックス研究討論会研究奨励賞

Dec. 2002, 第14回日本MRS学術シンポジウム講演奨励賞

Performance information

■ Paper

Photoluminescence properties of solid solutions of YNbO₄, GdNbO₄ and LuNbO₄
Hayato Sato; Shohei Kodama; Ikuo Yanase; Hiroaki Takeda
Journal of the Ceramic Society of Japan, 2025, [Reviewed]
Ceramic Society of Japan, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.25015
DOI ID：10.2109/jcersj2.25015, ISSN：1882-0743, eISSN：1348-6535

Fine structural analysis of calcium–niobium–gallium garnet (CNGG) by single-crystal anomalous X-ray scattering　　　　　　　　　　　　　　　
Ryo Yamane; Hiroaki Takeda; Takahiro Kuribayashi; Kazumasa Sugiyama; Tsuguo Fukuda
Journal of Crystal Growth, First page：127947, Last page：127947, Oct. 2024, [Reviewed]
Elsevier BV, Scientific journal
DOI：https://doi.org/10.1016/j.jcrysgro.2024.127947
DOI ID：10.1016/j.jcrysgro.2024.127947, ISSN：0022-0248

Flux growth and evaluation of optical properties of Ce doped Li₂CaSiO₄ as a candidate for noble neutron scintillator　　　　　　　　　　　　　　　
Shohei Kodama; Taiga Nishii; Miki Sodeno; Yusuke Urano; Shunsuke Kurosawa; Ikuo Yanase; Hiroaki Takeda
Journal of the Ceramic Society of Japan, Volume：132, Number：7, First page：369, Last page：374, Jul. 2024, [Reviewed]
Scientific journal
DOI：https://doi.org/10.2109/jcersj2.23214
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85197210970&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85197210970&origin=inward
DOI ID：10.2109/jcersj2.23214, ISSN：1882-0743, eISSN：1348-6535, SCOPUS ID：85197210970

Modification of photoluminescence wavelength and decay constant of Cr:Gd₃Ga₅O₁₂ substituted by Ca/Si cation pair
Natsuki Shimoyama; Shohei Kodama; Karol Bartosiewicz; Chihaya Fujiwara; Ikuo Yanase; Hiroaki Takeda
Journal of the Ceramic Society of Japan, Volume：132, Number：7, First page：364, Last page：368, Jul. 2024, [Reviewed]
Ceramic Society of Japan, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.23216
DOI ID：10.2109/jcersj2.23216, ISSN：1882-0743, eISSN：1348-6535

Capture of CO₂ from ambient air by sodium manganate and CO₂ recovery at low temperatures　　　　　　　　　　　　　　　
Ikuo Yanase; Hiroaki Nagashima; Teppei Okada; Shohei Kodama; Hiroaki Takeda
Journal of Physics and Chemistry of Solids, Volume：187, Apr. 2024, [Reviewed]
Scientific journal
DOI：https://doi.org/10.1016/j.jpcs.2024.111866
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85182418063&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85182418063&origin=inward
DOI ID：10.1016/j.jpcs.2024.111866, ISSN：0022-3697, SCOPUS ID：85182418063

Effect of strontium substitution on growth and piezoelectric properties of calcium magnesium silicate Ca₂MgSi₂O₇ single crystals　　　　　　　　　　　　　　　
Hiroaki Takeda; Takumi Uehara; Genki Hirano; Shohei Kodama; Ikuo Yanase; Kazumasa Sugiyama
Japanese Journal of Applied Physics, Volume：62, Number：SM, Nov. 2023, [Reviewed], [Lead]
Scientific journal
DOI：https://doi.org/10.35848/1347-4065/acf2a5
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85173570806&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85173570806&origin=inward
DOI ID：10.35848/1347-4065/acf2a5, ISSN：0021-4922, eISSN：1347-4065, SCOPUS ID：85173570806

Spark plasma sintering and ionic conductivity of Li_1.3Al_0.3Ti_1.7(PO₄)₃ fine particles synthesized by glass crystallization　　　　　　　　　　　　　　　
Tatsuya Tezuka; Yuma Inagaki; Shohei Kodama; Hiroaki Takeda; Ikuo Yanase
Powder Technology, Volume：429, First page：118870, Last page：118870, Nov. 2023, [Reviewed]
Elsevier BV, English, Scientific journal
DOI：https://doi.org/10.1016/j.powtec.2023.118870
DOI ID：10.1016/j.powtec.2023.118870, ISSN：0032-5910

Scanning time-resolved measurement of transient lattice strain on quartz oscillators resonating under alternating electric field
Shinobu Aoyagi; Yuhei Kondo; Kazuhira Miwa; Hiroaki Takeda; Yusuke Hayakawa; Youichi Kaminaga; Hitoshi Osawa
Japanese Journal of Applied Physics, Volume：62, Number：SM, First page：SM1028, Last page：SM1028, Sep. 2023, [Reviewed]
Abstract

Distributions of transient and local lattice strains on resonating AT-cut quartz oscillators were measured in situ by scanning time-resolved X-ray diffraction under an alternating electric field to reveal the effects of the crystal shape and electrode thickness on their piezoelectric vibration. The concentration of the lattice vibration amplitude and energy at the electrode center in a plano-convex type oscillator and enhancement of the lattice strain in a plano–plano type oscillator within the electrode area with increasing electrode thickness have been unambiguously demonstrated by the method without any surface modifications.
IOP Publishing, Scientific journal
DOI：https://doi.org/10.35848/1347-4065/acf475
DOI ID：10.35848/1347-4065/acf475, ISSN：0021-4922, eISSN：1347-4065

Cr-doped Al₂O₃–YAG binary and Al₂O₃–YAG–ZrO₂ ternary eutectic materials crystallized by the micro pulling down technique and their characterization
J. Xu; Y. Guyot; A. Nehari; A. Pillonnet; G. Ledoux; H. Takeda; X. Xiaodong; K. Lebbou
CrystEngComm, Volume：25, Number：34, First page：4834, Last page：4847, Jul. 2023, [Reviewed]
Cr-doped Al₂O₃–YAG and Al₂O₃–YAG–ZrO₂ eutectic ceramics rods of 3 mm in diameter were solidified from the melt by a micro-pulling down (μ-PD) technique.
Royal Society of Chemistry (RSC), Scientific journal
DOI：https://doi.org/10.1039/d3ce00626c
DOI ID：10.1039/d3ce00626c, eISSN：1466-8033

Synthesis and photoluminescence properties of divalent rare-earth-doped Li₂CaSiO₄
Shohei Kodama; Tomoki Saito; Ikuo Yanase; Hiroaki Takeda
Journal of the Ceramic Society of Japan, Volume：131, Number：7, First page：258, Last page：262, Jul. 2023, [Reviewed]
Ceramic Society of Japan, English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.22163
DOI ID：10.2109/jcersj2.22163, ISSN：1882-0743, eISSN：1348-6535

Synthesis and ionic conductivity of NASICON-type Li_1.4Al_0.4Ti_1.6(PO₄)₃ fine powder by a novel multi-step glass crystallization method　　　　　　　　　　　　　　　
Tatsuya Tezuka; Kouki Kuribara; Shohei Kodama; Hiroaki Takeda; Ikuo Yanase
Journal of Non-Crystalline Solids, Volume：590, First page：121675, Last page：121675, Aug. 2022, [Reviewed]
Elsevier BV, English, Scientific journal
DOI：https://doi.org/10.1016/j.jnoncrysol.2022.121675
DOI ID：10.1016/j.jnoncrysol.2022.121675, ISSN：0022-3093

Position and electric field dependent local lattice strain detected by nanobeam x-ray diffraction on a relaxor ferroelectric single crystal
Shinobu Aoyagi; Ayumi Aoyagi; Hiroaki Takeda; Hitoshi Osawa; Kazushi Sumitani; Yasuhiko Imai; Shigeru Kimura
Physical Review B, Volume：105, Number：2, First page：024101, Jan. 2022, [Reviewed]
American Physical Society (APS), English, Scientific journal
DOI：https://doi.org/10.1103/physrevb.105.024101
DOI ID：10.1103/physrevb.105.024101, ISSN：2469-9950, eISSN：2469-9969

Growth and characterization of strontium-substituted La₃Ta_0.5Ga_5.5O₁₄ single crystals
Hiroaki TAKEDA; Yudai SOBATA; Haruki USUI; Shohei KODAMA; Ikuo YANASE; Takuya HOSHINA; Takaaki TSURUMI; Kiyoshi SHIMAMURA
Journal of the Ceramic Society of Japan, Volume：130, Number：1, First page：16, Last page：20, Jan. 2022, [Reviewed], [Lead, Corresponding]
Ceramic Society of Japan, English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.21116
DOI ID：10.2109/jcersj2.21116, ISSN：1882-0743, eISSN：1348-6535

Effect of processing temperature on structural, optical and frequency dependent electrical responses of solid-state sintered bismuth sodium titanate　　　　　　　　　　　　　　　
M.A. Zubair; F.A. Mozahid; H. Takeda; A.K.M.A. Hossain
Materials Science and Engineering: B, Volume：274, First page：115474, Dec. 2021, [Reviewed]
Elsevier BV, Scientific journal
DOI：https://doi.org/10.1016/j.mseb.2021.115474
DOI ID：10.1016/j.mseb.2021.115474, ISSN：0921-5107

Na-ion conductivity of beta-NaFeO₂ synthesized from an EDTA chelate complex　　　　　　　　　　　　　　　
Ikuo Yanase; Naoki Kuwada; Kouki Kuribara; Shohei Kodama; Hiroaki Takeda
INORGANIC CHEMISTRY COMMUNICATIONS, Volume：134, First page：108913, Dec. 2021, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/j.inoche.2021.108913
DOI ID：10.1016/j.inoche.2021.108913, ISSN：1387-7003, eISSN：1879-0259, Web of Science ID：WOS:000710197900002

Time-Resolved Nanobeam X-ray Diffraction of a Relaxor Ferroelectric Single Crystal under an Alternating Electric Field　　　　　　　　　　　　　　　
Shinobu Aoyagi; Ayumi Aoyagi; Hiroaki Takeda; Hitoshi Osawa; Kazushi Sumitani; Yasuhiko Imai; Shigeru Kimura
Crystals, Volume：11, First page：1419, Nov. 2021, [Reviewed]
Scientific journal
DOI：https://doi.org/10.3390/cryst11111419
DOI ID：10.3390/cryst11111419, ORCID：103533945

Novel application of Tb-substituted layered double hydroxides to capturing and photoluminescence detecting CO₂ gas at ambient temperature　　　　　　　　　　　　　　　
Ikuo Yanase; Kouhei Hayashizaki; Masaki Kakiage; Hiroaki Takeda
Inorganic Chemistry Communications, Volume：125, First page：108394, Last page：108394, Mar. 2021, [Reviewed], [Last]
Scientific journal
DOI：https://doi.org/10.1016/j.inoche.2020.108394
DOI ID：10.1016/j.inoche.2020.108394, ISSN：1387-7003, eISSN：1879-0259, Web of Science ID：WOS:000620266700006

Control of Thermophysical Properties of Langasite-Type La₃Ta_0.5Ga_5.5O₁₄ Crystals for Pressure Sensors　　　　　　　　　　　　　　　
Haruki Usui; Makoto Tokuda; Kazumasa Sugiyama; Takuya Hoshina; Takaaki Tsurumi; Kheirreddine Lebbou; Ikuo Yanase; Hiroaki Takeda
Crystals, Volume：10, Number：10, First page：936, Last page：936, Oct. 2020, [Reviewed], [Last, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.3390/cryst10100936
DOI ID：10.3390/cryst10100936, ISSN：2073-4352, eISSN：2073-4352, Web of Science ID：WOS:000584488200001

Possibility of ferroelectric bismuth and nitrogen co-doped barium titanate　　　　　　　　　　　　　　　
Takahiro YAMADA; Hiroaki TAKEDA; Takaaki TSURUMI; Takuya HOSHINA
Journal of the Ceramic Society of Japan, Volume：128, Number：8, First page：486, Last page：491, Aug. 2020, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.20020
DOI ID：10.2109/jcersj2.20020, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000557848300011

Crystal growth and characterization of Li_xLa₍₁₋_x_)/3NbO₃ using Czochralski method　　　　　　　　　　　　　　　
Shuya MINEGISHI; Takuya HOSHINA; Takaaki TSURUMI; Kheirreddine LEBBOU; Hiroaki TAKEDA
Journal of the Ceramic Society of Japan, Volume：128, Number：8, First page：481, Last page：485, Aug. 2020, [Reviewed], [Last, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.20026
DOI ID：10.2109/jcersj2.20026, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000557848300010

Structure and electrical properties of Ba₃TaGa₃Si₂O₁₄ single crystals grown by Czochralski method　　　　　　　　　　　　　　　
Haruki USUI; Hiraku KUSAKABE; Makoto TOKUDA; Kazumasa SUGIYAMA; Takuya HOSHINA; Takaaki TSURUMI; Hiroaki TAKEDA
Journal of the Ceramic Society of Japan, Volume：128, Number：8, First page：441, Last page：446, Aug. 2020, [Reviewed], [Last, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.20016
DOI ID：10.2109/jcersj2.20016, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000557848300003

Strontium-substituted calcium magnesium silicate single crystals for high-temperature piezoelectric applications　　　　　　　　　　　　　　　
Hiroaki TAKEDA; Hiraku KUSAKABE; Haruki USUI; Takuya HOSHINA; Takaaki TSURUMI; Kheirreddine LEBBOU
Journal of the Ceramic Society of Japan, Volume：128, Number：3, First page：130, Last page：134, Mar. 2020, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.19193
DOI ID：10.2109/jcersj2.19193, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000516765300004

Terahertz dielectric response of nano-grained barium titanate ceramics measured by far-infrared spectroscopic ellipsometry　　　　　　　　　　　　　　　
YuHsun Liao; Shuhei Takezawa; Hiroaki Takeda; Takaaki Tsurumi; Takuya Hoshina
Japanese Journal of Applied Physics, Volume：58, Number：SL, First page：SLLA07, Nov. 2019, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.7567/1347-4065/ab38d2
DOI ID：10.7567/1347-4065/ab38d2, ISSN：0021-4922, eISSN：1347-4065, Web of Science ID：WOS:000497974800007

Doping effect of Nb on ionic polarization of SrTiO₃　　　　　　　　　　　　　　　
Nishiyama Junji; Kanehara Kazuki; Takeda Hiroaki; Tsurumi Takaaki; Hoshina Takuya
Journal of the Ceramic Society of Japan, Volume：127, Number：6, First page：357, Last page：361, Jun. 2019, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.19031
DOI ID：10.2109/jcersj2.19031, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000485680600005

Electroacoustical constants and Rayleigh surface acoustic wave propagation characteristics of calcium aluminate silicate Ca₂Al₂SiO₇ single crystals　　　　　　　　　　　　　　　
Hiroaki Takeda; Kyohei Akimoto; Takuto Oshima; Kenta Takizawa; Jun Kondoh; Akihiro Matsutani; Takuya Hoshina; Takaaki Tsurumi
Japanese Journal of Applied Physics, Volume：57, Number：11, First page：11UD01, Nov. 2018, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.7567/JJAP.57.11UD01
DOI ID：10.7567/JJAP.57.11UD01, ISSN：0021-4922, eISSN：1347-4065, Web of Science ID：WOS:000450231800015

Time-resolved structure analysis of piezoelectric crystals by X-ray diffraction under alternating el
Aoyagi Shinobu; Osawa Hitoshi; Sugimoto Kunihisa; Nakahira Yuki; Moriyoshi Chikako; Kuroiwa Yoshihiro; Takeda Hiroaki; Tsurumi Takaaki
Japanese Journal of Applied Physics, Volume：57, Number：11, First page：11UB06, Nov. 2018, [Reviewed]
IOP Publishing, Scientific journal
DOI：https://doi.org/10.7567/jjap.57.11ub06
DOI ID：10.7567/jjap.57.11ub06, ISSN：0021-4922, eISSN：1347-4065

Grain size effect on piezoelectric properties of BaTiO₃ ceramics　　　　　　　　　　　　　　　
Hoshina Takuya; Hatta Saki; Takeda Hiroaki; Tsurumi Takaaki
Japanese Journal of Applied Physics, Volume：57, Number：9, First page：0902BB, Sep. 2018, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.7567/JJAP.57.0902BB
DOI ID：10.7567/JJAP.57.0902BB, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804431, Web of Science ID：WOS:000437483500001

Structure of russellite (Bi₂WO₆): origin of ferroelectricity and the effect of the stereoactive lone electron pair on the structure　　　　　　　　　　　　　　　
Hiroki Okudera; Yuka Sakai; Kentaro Yamagata; Hiroaki Takeda
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials, Volume：74, Number：3, First page：295, Last page：303, Jun. 2018, [Reviewed], [Last]
English, Scientific journal
DOI：https://doi.org/10.1107/S2052520618006133
DOI ID：10.1107/S2052520618006133, ISSN：2052-5206, ORCID：47804433, SCOPUS ID：85048500840, Web of Science ID：WOS:000434798000005

Growth and characterization of Ca_2-xAe_xAl₂SiO₇ (Ae = Sr, Ba) piezoelectric single crystals　　　　　　　　　　　　　　　
Takuto Oshima; Takuya Hoshina; Takaaki Tsurumi; Kheirreddine Lebbou; Hiroaki Takeda
Journal of the Ceramic Society of Japan, Volume：126, Number：5, First page：300, Last page：305, May 2018, [Reviewed], [Last, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.17263
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85046375329&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85046375329&origin=inward
DOI ID：10.2109/jcersj2.17263, ISSN：1348-6535, eISSN：1348-6535, ORCID：47804432, SCOPUS ID：85046375329, Web of Science ID：WOS:000431293500008

Effect of oxygen vacancies on intrinsic dielectric permittivity of strontium titanate ceramics　　　　　　　　　　　　　　　
Takuya Hoshina; Ryuichi Sase; Junji Nishiyama; Hiroaki Takeda; Takaaki Tsurumi
Journal of the Ceramic Society of Japan, Volume：126, Number：5, First page：263, Last page：268, May 2018, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.17250
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85046361765&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85046361765&origin=inward
DOI ID：10.2109/jcersj2.17250, ISSN：1348-6535, eISSN：1348-6535, ORCID：47804430, SCOPUS ID：85046361765, Web of Science ID：WOS:000431293500002

Transparent semiconducting SrTiO₃ crystal fabricated by heating treatment with gaseous ammonia and CeO₂ powder　　　　　　　　　　　　　　　
Yuka Morimoto; Junji Nishiyama; Hiroaki Takeda; Takaaki Tsurumi; Takuya Hoshina
Scientific Reports, Volume：8, First page：5031, Mar. 2018, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1038/s41598-018-23019-9
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85044400513&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85044400513&origin=inward
DOI ID：10.1038/s41598-018-23019-9, ISSN：2045-2322, eISSN：2045-2322, ORCID：47804434, PubMed ID：29568047, SCOPUS ID：85044400513, Web of Science ID：WOS:000428032800003

Optical and structural characterization of ZnSe thin film fabricated by thermal vapour deposition technique　　　　　　　　　　　　　　　
Mohammed Tareque Chowdhury; Md. Abdullah Zubair; Hiroaki Takeda; Kazi Md. Amjad Hussain; Md. Fakhrul Islam
AIMS Materials Science, Volume：4, Number：5, First page：1095, Last page：1121, Oct. 2017, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.3934/matersci.2017.5.1095
DOI ID：10.3934/matersci.2017.5.1095, ISSN：2372-0468, ORCID：47804439, SCOPUS ID：85037068782, Web of Science ID：WOS:000416071600005

Elution of lead from lead zirconate titanate ceramics to acid rain　　　　　　　　　　　　　　　
Takaaki Tsurumi; Shuhei Takezawa; Takuya Hoshina; Hiroaki Takeda
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：56, Number：10, First page：10PD01, Oct. 2017, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.7567/JJAP.56.10PD01
DOI ID：10.7567/JJAP.56.10PD01, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804436, Web of Science ID：WOS:000413800800024

Effect of atomic vacancies on ionic polarization of nonstoichiometric strontium titanate ceramics　　　　　　　　　　　　　　　
Ryuichi Sase; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：56, Number：10, First page：10PB11, Oct. 2017, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.7567/JJAP.56.10PB11
DOI ID：10.7567/JJAP.56.10PB11, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804435, Web of Science ID：WOS:000413800800013

Formation of sodium bismuth titanatebarium titanate during solid-state synthesis　　　　　　　　　　　　　　　
Dong Hou; Elena Aksel; Chris M. Fancher; Tedi-Marie Usher; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi; Jacob L. Jones
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Volume：100, Number：4, First page：1330, Last page：1338, Apr. 2017, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1111/jace.14631
DOI ID：10.1111/jace.14631, ISSN：0002-7820, eISSN：1551-2916, ORCID：47804437, Web of Science ID：WOS:000399610800014

Growth and characterization of strontium-substituted Ca₂Al₂SiO₇ piezoelectric single crystals　　　　　　　　　　　　　　　
Hiroaki Takeda; Kyohei Yoshida; Hiroki Okudera; Kheirreddine Lebbou; Takuya Hoshina; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：125, Number：1, First page：23, Last page：26, Jan. 2017, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.16206
DOI ID：10.2109/jcersj2.16206, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804438, Web of Science ID：WOS:000392432500005

Electro-optic effect and photoelastic effect of feroelectric relaxors　　　　　　　　　　　　　　　
Kotaro Takeda; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：55, Number：10, Oct. 2016, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.7567/JJAP.55.10TB05
DOI ID：10.7567/JJAP.55.10TB05, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804440, Web of Science ID：WOS:000391101200026

Wideband dielectric spectroscopy of (Sr_0.7Bi_0.2)TiO₃ ceramics and its microscopic mechanism of polarization　　　　　　　　　　　　　　　
Motoharu Sakurai; Kazuki Kanehara; Hiroaki Takeda; Takaaki Tsurumi; Takuya Hoshina
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：124, Number：6, First page：664, Last page：667, Jun. 2016, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.16023
DOI ID：10.2109/jcersj2.16023, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804441, Web of Science ID：WOS:000379611300010

Effects of aluminum substitution on the structure and electric properties of langasite family crystals　　　　　　　　　　　　　　　
Hiroaki Takeda; Jun-ichi Yamaura; Takashi Nishida; Takuya Hoshina; Takaaki Tsurumi
CRYSTAL RESEARCH AND TECHNOLOGY, Volume：50, Number：12, First page：944, Last page：949, Dec. 2015, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1002/crat.201500261
DOI ID：10.1002/crat.201500261, ISSN：0232-1300, eISSN：1521-4079, ORCID：47804444, Web of Science ID：WOS:000368276700005

Fabrication and characterization of dielectric strontium titanium oxynitride single crystal　　　　　　　　　　　　　　　
Takuya Hoshina; Akira Sahashi; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：54, Number：10, Oct. 2015, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.7567/JJAP.54.10NB05
DOI ID：10.7567/JJAP.54.10NB05, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804445, Web of Science ID：WOS:000362286000023

Development of microscopic measurement system for electro-optic effect　　　　　　　　　　　　　　　
Ryuta Yamamoto; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：123, First page：929, Last page：932, Sep. 2015, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.123.929
DOI ID：10.2109/jcersj2.123.929, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804443, Web of Science ID：WOS:000362504400038

Terahertz permittivity of rutile TiO₂ single crystal measured by anisotropic far-infrared ellipsometry　　　　　　　　　　　　　　　
Kazuki Kanehara; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：123, First page：303, Last page：306, May 2015, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.123.303
DOI ID：10.2109/jcersj2.123.303, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804446, Web of Science ID：WOS:000353912500001

Design and fabrication of acoustic matching layer for lead-free ultrasonic flowmeter　　　　　　　　　　　　　　　
Mei Hotate; Daichi Yoshidome; Takahiro Kojima; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：123, First page：317, Last page：321, May 2015, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.123.317
DOI ID：10.2109/jcersj2.123.317, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804442, Web of Science ID：WOS:000353912500004

Terahertz dielectric response of single-domain BaTiO₃ measured by far-infrared spectroscopic ellipsometry　　　　　　　　　　　　　　　
Takuya Hoshina; Kazuki Kanehara; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：53, Number：9, First page：09PD03, Sep. 2014, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.7567/JJAP.53.09PD03
DOI ID：10.7567/JJAP.53.09PD03, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804454, Web of Science ID：WOS:000343068600035

Measurement of ionic polarization of SrTiO₃ single crystal by far-infrared spectroscopic ellipsometry　　　　　　　　　　　　　　　
Kazuki Kanehara; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
APPLIED PHYSICS LETTERS, Volume：105, Number：4, First page：042901, Jul. 2014, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1063/1.4891767
DOI ID：10.1063/1.4891767, ISSN：0003-6951, eISSN：1077-3118, ORCID：47804452, Web of Science ID：WOS:000341152600059

Fabrication of ferroelectric silicate KNbSi₂O₇ single crystal　　　　　　　　　　　　　　　
Akira Sahashi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：122, First page：389, Last page：392, Jun. 2014, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.122.389
DOI ID：10.2109/jcersj2.122.389, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804450, Web of Science ID：WOS:000342065200006

Effects of Ca substitution on room temperature resistivity of donor-doped barium titanate based PTCR ceramics　　　　　　　　　　　　　　　
Kohei Matsuura; Takuya Hoshina; Hiroaki Takeda; Yukio Sakabe; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：122, First page：402, Last page：405, Jun. 2014, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.122.402
DOI ID：10.2109/jcersj2.122.402, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804449, Web of Science ID：WOS:000342065200009

Phase transition of Bi$_2$WO$_6$ below 300 K　　　　　　　　　　　　　　　
Yoneda, Yasuhiro; Takeda, Hiroaki; Tsurumi, Takaaki
JPS Conference Proceedings (Internet), Volume：1, First page：012103\_1, Last page：012103\_4, Mar. 2014, [Reviewed]
Bi$_2$WO$_6$ is the simplest member of the Aurivillius family of (Bi$_2$O$_2$)(A$_{m-1}$B$_m$O$_{3m+1}$) with one oxygen octahedron sandwiched between two Bi$_2$O$_2$ layers (m=1). We report the high-energy synchrotron X-ray diffraction study of ferroelectric Bi$_2$WO$_6$ at low temperatures, and a new phase transition was found around 200 K. The mechanism of this phase transition was examined by atomic pair-distribution function (PDF) method.
English
DOI：https://doi.org/10.7566/JPSCP.1.012103
DOI ID：10.7566/JPSCP.1.012103

Origin of Semiconducting Behavior of CaO Added BaTiO₃-(Bi_1/2Na_1/2)TiO₃ Ceramics　　　　　　　　　　　　　　　
Hitomi Akutsu; Mohammad A. Zubair; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
Key Engineering Materials, Volume：582, First page：92, Last page：95, Jan. 2014, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.582.92
DOI ID：10.4028/www.scientific.net/KEM.582.92, ISSN：1013-9826, ORCID：47804453, Web of Science ID：WOS:000336235300022

Improvement of insulation reliability of BaTiO₃-based ceramics using mixed conductive electrode　　　　　　　　　　　　　　　
Daichi Yoshidome; Takuya Hoshina; Hiroaki Takeda; Yukio Sakabe; Takaaki Tsurumi
Key Engineering Materials, Volume：582, First page：44, Last page：47, Jan. 2014, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.582.44
DOI ID：10.4028/www.scientific.net/KEM.582.44, ISSN：1013-9826, ORCID：47804451, Web of Science ID：WOS:000336235300011

Domain Contribution to Elastic Nonlinearity in Pb(Zr, Ti)O₃-based Piezoelectric Ceramics　　　　　　　　　　　　　　　
Manabu Hagiwara; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
Key Engineering Materials, Volume：582, First page：3, Last page：6, Jan. 2014, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.582.3
DOI ID：10.4028/www.scientific.net/KEM.582.3, ISSN：1013-9826, ORCID：47804448, Web of Science ID：WOS:000336235300001

Characterization of Cu₂O Thin Film grown by Molecular Beam Epitaxy　　　　　　　　　　　　　　　
Takumi Oshima; Masaya Nohara; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
Key Engineering Materials, Volume：582, First page：157, Last page：160, Jan. 2014, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.582.157
DOI ID：10.4028/www.scientific.net/KEM.582.157, ISSN：1013-9826, ORCID：47804447, Web of Science ID：WOS:000336235300037

Bulk response and grain boundary microelectrical activity of high T_C BaTiO₃-(Bi_1/2K_1/2)TiO₃-based positive temperature coefficient of resistance ceramics　　　　　　　　　　　　　　　
Zubair Mohammad A; Takeda Hiroaki; Leach Colin; Freer Robert; Hoshina Takuya; Tsurumi Takaaki
Journal of Materials Research, Volume：28, Number：21, First page：2946, Last page：2959, Nov. 2013, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1557/jmr.2013.282
DOI ID：10.1557/jmr.2013.282, ISSN：0884-2914, eISSN：2044-5326, ORCID：47804456, Web of Science ID：WOS:000326936700003

Synthesis of Lead-Free Air-Sintered BaTiO₃-(Bi_1/2Na_1/2)TiO₃-Based Positive-Temperature-Coefficient of Resistance Ceramics by Ca Addition and the Defect Chemistry of Semiconductivity　　　　　　　　　　　　　　　
Mohammad A. Zubair; Hiroaki Takeda; Takuya Hoshina; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：52, Number：9, First page：09KG01, Sep. 2013, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.7567/JJAP.52.09KG01
DOI ID：10.7567/JJAP.52.09KG01, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804466, Web of Science ID：WOS:000324890800053

Growth and Characterization of Ca₂Al₂SiO₇ Piezoelectric Single Crystals for High-Temperature Sensor Applications　　　　　　　　　　　　　　　
Manabu Hagiwara; Hiroaki Noguchi; Takuya Hoshina; Hiroaki Takeda; Shinobu Fujihara; Nobuhiro Kodama; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：52, Number：9, First page：09KD03, Sep. 2013, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.7567/JJAP.52.09KD03
DOI ID：10.7567/JJAP.52.09KD03, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804460, Web of Science ID：WOS:000324890800026

Grain Size Effect on Dielectric Properties of Ba_0.92Ca_0.08TiO₃ Ceramics　　　　　　　　　　　　　　　
Takuya Hoshina; Tsutomu Furuta; Takahiro Yamazaki; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：52, Number：9, First page：09KC05, Sep. 2013, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.7567/JJAP.52.09KC05
DOI ID：10.7567/JJAP.52.09KC05, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804459, Web of Science ID：WOS:000324890800022

Design, simulation, and fabrication of longitudinal electro-optically tuned transparent-comb-electrode photonic crystals　　　　　　　　　　　　　　　
Jong-Min Oh; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：121, First page：659, Last page：663, Aug. 2013, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.121.659
DOI ID：10.2109/jcersj2.121.659, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804458, Web of Science ID：WOS:000330212700019

Relation between electro-optic effect and dielectric permittivity of Ba_0.5Sr_0.5TiO₃ thin films　　　　　　　　　　　　　　　
Kotaro Takeda; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
Key Engineering Materials, Volume：566, First page：20, Last page：24, Jul. 2013, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.566.20
DOI ID：10.4028/www.scientific.net/KEM.566.20, ISSN：1013-9826, ORCID：47804465, Web of Science ID：WOS:000324451300005

Polarization mechanism of fine-grained BaTiO₃ ceramics at high temperature region　　　　　　　　　　　　　　　
Takahiro Yamazaki; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
Key Engineering Materials, Volume：566, First page：12, Last page：15, Jul. 2013, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.566.12
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84883491784&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84883491784&origin=inward
DOI ID：10.4028/www.scientific.net/KEM.566.12, ISSN：1013-9826, eISSN：1662-9795, ORCID：47804464, SCOPUS ID：84883491784, Web of Science ID：WOS:000324451300003

Influence of atmosphere on resistivity of aluminum substituted La₃Ta_0.5Ga_5.5O₁₄ single crystals during growth and annealing process　　　　　　　　　　　　　　　
Hiroaki Noguchi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
Key Engineering Materials, Volume：566, First page：81, Last page：84, Jul. 2013, [Reviewed], [Corresponding]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.566.81
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84883499654&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84883499654&origin=inward
DOI ID：10.4028/www.scientific.net/KEM.566.81, ISSN：1013-9826, eISSN：1662-9795, ORCID：47804462, SCOPUS ID：84883499654, Web of Science ID：WOS:000324451300018

Highly tunable transparent-comb-electrode photonic crystals based on Al-doped ZnO/(Pb,La)(Zr,Ti)O₃ multilayer　　　　　　　　　　　　　　　
Jong-Min Oh; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
Applied Physics Express, Volume：6, Number：6, First page：062001, Jun. 2013, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.7567/APEX.6.062001
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84880885135&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84880885135&origin=inward
DOI ID：10.7567/APEX.6.062001, ISSN：1882-0778, eISSN：1882-0786, ORCID：47804461, SCOPUS ID：84880885135, Web of Science ID：WOS:000320167300010

Calcium aluminate silicate Ca₂Al₂SiO₇ single crystal applicable to piezoelectric sensors at high temperature　　　　　　　　　　　　　　　
Hiroaki Takeda; Manabu Hagiwara; Hiroaki Noguchi; Takuya Hoshina; Tomoko Takahashi; Nobuhiro Kodama; Takaaki Tsurumi
APPLIED PHYSICS LETTERS, Volume：102, Number：24, First page：242907, Jun. 2013, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1063/1.4811163
DOI ID：10.1063/1.4811163, ISSN：0003-6951, eISSN：1077-3118, ORCID：47804457, Web of Science ID：WOS:000320962400079

Influence of Misfit Strain on Longitudinal Electro-optic Properties in Preferentially Oriented (Pb,La)(Zr,Ti)O₃ Films　　　　　　　　　　　　　　　
Jong-Min Oh; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：52, Number：3, First page：035801, Mar. 2013, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.7567/JJAP.52.035801
DOI ID：10.7567/JJAP.52.035801, ISSN：0021-4922, ORCID：47804463, Web of Science ID：WOS:000315668900038

Bulk and conductive mode investigations of Pb free PTCR ceramics with high switch temperature　　　　　　　　　　　　　　　
Mohammad A. Zubair; Hiroaki Takeda; Colin Leach; Robert Freer; Takuya Hoshina; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：121, First page：268, Last page：272, Mar. 2013, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.121.268
DOI ID：10.2109/jcersj2.121.268, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804455, Web of Science ID：WOS:000316771200003

High electro-optic kerr effect in (Bi,K,Na)TiO₃ relaxor single crystals　　　　　　　　　　　　　　　
Kotaro Takeda; Takuya Hoshina; Hiroaki Takeda; Yuji Noguchi; Masaru Miyayama; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：120, First page：613, Last page：615, Dec. 2012, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.120.613
DOI ID：10.2109/jcersj2.120.613, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804470, Web of Science ID：WOS:000312978400012

Electro-optic effect of lithium niobate in piezoelectric resonance　　　　　　　　　　　　　　　
Kotaro Takeda; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF APPLIED PHYSICS, Volume：112, Number：12, First page：124105, Dec. 2012, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1063/1.4769306
DOI ID：10.1063/1.4769306, ISSN：0021-8979, ORCID：47804468, Web of Science ID：WOS:000312829400091

Local Structure Analysis of Bi₂WO₆　　　　　　　　　　　　　　　
Yasuhiro Yoneda; Shinji Kohara; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：51, Number：9, First page：09LE06, Sep. 2012, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.51.09LE06
DOI ID：10.1143/JJAP.51.09LE06, ISSN：0021-4922, ORCID：47804472, Web of Science ID：WOS:000309007900054

Identicalness between Piezoelectric Loss and Dielectric Loss in Converse Effect of Piezoelectric Ceramic Resonators　　　　　　　　　　　　　　　
Manabu Hagiwara; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：51, Number：9, First page：09LD10, Sep. 2012, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.51.09LD10
DOI ID：10.1143/JJAP.51.09LD10, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804471, Web of Science ID：WOS:000309007900042

Grain Size Effect on Dielectric Properties of Ba(Zr,Ti)O₃ Ceramics　　　　　　　　　　　　　　　
Takuya Hoshina; Tsutomu Furuta; Takahiro Yamazaki; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：51, Number：9, First page：09LC04, Sep. 2012, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.51.09LC04
DOI ID：10.1143/JJAP.51.09LC04, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804469, Web of Science ID：WOS:000309007900027

Analysis of Vibration Waveforms of Electromechanical Response to Determine Piezoelectric and Electrostrictive Coefficients　　　　　　　　　　　　　　　
Tatsuya Izumi; Manabu Hagiwara; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Volume：59, Number：8, First page：1632, Last page：1638, Aug. 2012, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1109/TUFFC.2012.2369
DOI ID：10.1109/TUFFC.2012.2369, ISSN：0885-3010, ORCID：47804467, Web of Science ID：WOS:000307831900004

Quasi-millimeter-wave absorption behavior in Y/Yb-stabilized zirconia ceramics　　　　　　　　　　　　　　　
Takashi Teranishi; Naoki Akiyama; Keiko Ayano; Hidetaka Hayashi; Akira Kishimoto; Kazuhiro Fujimori; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
APPLIED PHYSICS LETTERS, Volume：100, Number：24, First page：242903, Jun. 2012, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1063/1.4729147
DOI ID：10.1063/1.4729147, ISSN：0003-6951, ORCID：47804474, Web of Science ID：WOS:000305269200056

Longitudinal electro-optic effect of highly (100) oriented (Pb,La)(Zr,Ti)O₃ film grown on a transparent Al-doped ZnO electrode　　　　　　　　　　　　　　　
Jong-Min Oh; Kotaro Takeda; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：120, First page：166, Last page：170, May 2012, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.120.166
DOI ID：10.2109/jcersj2.120.166, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804473, Web of Science ID：WOS:000304226200002

Fabrication of lead-free semiconducting ceramics using a BaTiO₃-(Bi_1/2Na_1/2)TiO₃ system by adding CaO　　　　　　　　　　　　　　　
Takashi Tateishi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：119, First page：828, Last page：831, Nov. 2011, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.119.828
DOI ID：10.2109/jcersj2.119.828, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804481, Web of Science ID：WOS:000297279300011

Shrinkage Behaviors and Sintering Mechanism of BaTiO₃ Ceramics in Two-Step Sintering　　　　　　　　　　　　　　　
Takuya Hoshina; Yoichi Kigoshi; Tsutomu Furuta; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：50, Number：9, First page：09NC07, Sep. 2011, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.50.09NC07
DOI ID：10.1143/JJAP.50.09NC07, ISSN：0021-4922, ORCID：47804484, Web of Science ID：WOS:000295032000021

Effect of Material Constants on Power Output in Piezoelectric Vibration-Based Generators　　　　　　　　　　　　　　　
Hiroaki Takeda; Kensuke Mihara; Tomohiro Yoshimura; Takuya Hoshina; Takaaki Tsurumi
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Volume：58, Number：9, First page：1852, Last page：1859, Sep. 2011, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1109/TUFFC.2011.2023
DOI ID：10.1109/TUFFC.2011.2023, ISSN：0885-3010, eISSN：1525-8955, ORCID：47804478, Web of Science ID：WOS:000295101600017

Analysis of Nonlinear Transient Responses of Piezoelectric Resonators　　　　　　　　　　　　　　　
Manabu Hagiwara; Seita Takahashi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Volume：58, Number：9, First page：1721, Last page：1729, Sep. 2011, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1109/TUFFC.2011.2009
DOI ID：10.1109/TUFFC.2011.2009, ISSN：0885-3010, ORCID：47804475, Web of Science ID：WOS:000295101600003

The effect of oxygen vacancies on the dielectric responses of BaTiO₃ based ceramics in the ultra-wide frequency range　　　　　　　　　　　　　　　
Youn-Kyu Choi; Takuya Hoshina; Hiroaki Takeda; Jong-Min Oh; Takaaki Tsurumi
Key Engineering Materials, Volume：485, First page：15, Last page：18, Jul. 2011, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.485.15
DOI ID：10.4028/www.scientific.net/KEM.485.15, ISSN：1013-9826, ORCID：47804485, Web of Science ID：WOS:000309191700004

Influence of Schottky interfaces on dielectric properties in perovskite-type oxide thin-film capacitors　　　　　　　　　　　　　　　
Naohiro Horiuchi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
Key Engineering Materials, Volume：485, First page：203, Last page：206, Jul. 2011, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.485.203
DOI ID：10.4028/www.scientific.net/KEM.485.203, ISSN：1013-9826, ORCID：47804483, Web of Science ID：WOS:000309191700049

Fabrication of Lead-free Semiconducting Ceramics Using BaTiO₃-(Bi_1/2Na_1/2)TiO₃ System by Sintering in Air Atmosphere　　　　　　　　　　　　　　　
Takashi Tateishi; Han Joong-Sang; Hiroaki Takeda; Takuya Hoshina; Spela Kunej; Takaaki Tsurumi
Key Engineering Materials, Volume：485, First page：245, Last page：248, Jul. 2011, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.485.245
DOI ID：10.4028/www.scientific.net/KEM.485.245, ISSN：1013-9826, ORCID：47804482, Web of Science ID：WOS:000309191700059

Fabrication of BaTiO₃ Films on Si Substrate by Inkjet Printing　　　　　　　　　　　　　　　
Ai Komatsu; Takuya Hoshina; Spela Kunej; Hiroaki Takeda; Takaaki Tsurumi
Key Engineering Materials, Volume：485, First page：187, Last page：190, Jul. 2011, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.485.187
DOI ID：10.4028/www.scientific.net/KEM.485.187, ISSN：1013-9826, ORCID：47804480, Web of Science ID：WOS:000309191700045

Dielectric Properties of Nanograined BaTiO₃ Ceramics Fabricated by Aerosol Deposition Method　　　　　　　　　　　　　　　
Tsutomu Furuta; Saki Hatta; Yoichi Kigoshi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
Key Engineering Materials, Volume：485, First page：183, Last page：186, Jul. 2011, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.485.183
DOI ID：10.4028/www.scientific.net/KEM.485.183, ISSN：1013-9826, ORCID：47804477, Web of Science ID：WOS:000309191700044

Characterization of Grain Boundaries of Lead-free Semiconducting Ceramics Using BaTiO₃-(Bi_1/2K_1/2)TiO₃ System　　　　　　　　　　　　　　　
Hiroaki Takeda; Joong-Sang Han; Takashi Tateishi; Spela Kunej; Colin Leach; Robert Freer; Takuya Hoshina; Takaaki Tsurumi
Key Engineering Materials, Volume：485, First page：241, Last page：244, Jul. 2011, [Reviewed], [Lead, Corresponding]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.485.241
DOI ID：10.4028/www.scientific.net/KEM.485.241, ISSN：1013-9826, ORCID：47804476, Web of Science ID：WOS:000309191700058

Effect of Oxygen Vacancy and Oxygen Vacancy Migration on Dielectric Response of BaTiO₃-Based Ceramics　　　　　　　　　　　　　　　
Youn-Kyu Choi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：50, Number：3, First page：031504, Mar. 2011, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.50.031504
DOI ID：10.1143/JJAP.50.031504, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804479, Web of Science ID：WOS:000288649800027

Size Effect and Domain-Wall Contribution of Barium Titanate Ceramics　　　　　　　　　　　　　　　
Takuya Hoshina; Yoichi Kigoshi; Saki Hatta; Takashi Teranishi; Hiroaki Takeda; Takaaki Tsurumi
FERROELECTRICS, Volume：402, Number：1, First page：29, Last page：36, Nov. 2010, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1080/00150191003697179
DOI ID：10.1080/00150191003697179, ISSN：0015-0193, eISSN：1563-5112, ORCID：47804504, Web of Science ID：WOS:000284477300005

Effects of oxygen vacancies and grain sizes on the dielectric response of BaTiO₃　　　　　　　　　　　　　　　
Youn-Kyu Choi; Takuya Hoshina; Hiroaki Takeda; Takeshi Teranishi; Takaaki Tsurumi
APPLIED PHYSICS LETTERS, Volume：97, Number：21, First page：212907, Nov. 2010, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1063/1.3508947
DOI ID：10.1063/1.3508947, ISSN：0003-6951, ORCID：47804493, Web of Science ID：WOS:000284618300040

Effects of Ca and Zr additions and stoichiometry on the electrical properties of barium titanate-based ceramics　　　　　　　　　　　　　　　
Youn Kyu Choi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：118, First page：881, Last page：886, Oct. 2010, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.118.881
DOI ID：10.2109/jcersj2.118.881, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804492, Web of Science ID：WOS:000283412100006

Analysis of Polarization Behavior in Relaxation of BaTiO₃-Based Ferroelectrics Using Wideband Dielectric Spectroscopy　　　　　　　　　　　　　　　
Takashi Teranishi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Volume：57, Number：10, First page：2118, Last page：2126, Oct. 2010, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1109/TUFFC.2010.1667
DOI ID：10.1109/TUFFC.2010.1667, ISSN：0885-3010, ORCID：47804486, Web of Science ID：WOS:000283366000002

Size Effect of Nanograined BaTiO₃ Ceramics Fabricated by Aerosol Deposition Method　　　　　　　　　　　　　　　
Takuya Hoshina; Tsutomu Furuta; Yoichi Kigoshi; Saki Hatta; Naohiro Horiuchi; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：49, Number：9, First page：09MC02, Sep. 2010, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.49.09MC02
DOI ID：10.1143/JJAP.49.09MC02, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804505, Web of Science ID：WOS:000282137100023

Nonlinear Shear Responses of Lead Zirconate Titanate Piezoelectric Ceramics　　　　　　　　　　　　　　　
Manabu Hagiwara; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：49, Number：9, First page：09MD04, Sep. 2010, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.49.09MD04
DOI ID：10.1143/JJAP.49.09MD04, ISSN：0021-4922, eISSN：1347-4065, ORCID：47804502, Web of Science ID：WOS:000282137100038

The influence of metal/perovskite-type oxide interfaces on tunability of thin film capacitors　　　　　　　　　　　　　　　
Naohiro Horiuchi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：118, First page：664, Last page：668, Aug. 2010, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.118.664
DOI ID：10.2109/jcersj2.118.664, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804506, Web of Science ID：WOS:000281229200010

Cation distribution and piezoelectric properties of aluminum substituted La₃Ta_0.5Ga_5.5O₁₄ single crystals　　　　　　　　　　　　　　　
Hiroaki Takeda; Jun-ichi Yamaura; Takuya Hoshina; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：118, First page：706, Last page：710, Aug. 2010, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.118.706
DOI ID：10.2109/jcersj2.118.706, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804488, Web of Science ID：WOS:000281229200019

Analysis on dipole polarization of BaTiO₃-based ferroelectric ceramics by Raman spectroscopy　　　　　　　　　　　　　　　
Takashi Teranishi; Naohiro Horiuchi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：118, First page：679, Last page：682, Aug. 2010, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.118.679
DOI ID：10.2109/jcersj2.118.679, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804487, Web of Science ID：WOS:000281229200013

Nonlinear shear response in (K,Na)NbO₃-based lead-free piezoelectric ceramics　　　　　　　　　　　　　　　
Manabu Hagiwara; Seita Takahashi; Takuya Hoshina; Hiroaki Takeda; Osamu Sakurai; Takaaki Tsurumi
Key Engineering Materials, Volume：445, First page：47, Last page：50, Jul. 2010, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.445.47
DOI ID：10.4028/www.scientific.net/KEM.445.47, ISSN：1013-9826, ORCID：47804501, Web of Science ID：WOS:000291630900012

Evolution of Internal Stress and Influence on Dielectric Properties by Number of Dielectric Layers in MLCC　　　　　　　　　　　　　　　
Satoshi Yokomizo; Takuya Hoshina; Hiroaki Takeda; Katsuya Taniguchi; Youichi Mizuno; Hirokazu Chazono; Osamu Sakurai; Takaaki Tsurumi
Key Engineering Materials, Volume：445, First page：31, Last page：34, Jul. 2010, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.445.31
DOI ID：10.4028/www.scientific.net/KEM.445.31, ISSN：1013-9826, ORCID：47804495, Web of Science ID：WOS:000291630900008

Effect of Metal-Dielectric Interfaces on Tunability in Barium Strontium Titanate Thin-film Capacitor　　　　　　　　　　　　　　　
Naohiro Horiuchi; Takuya Hoshina; Hiroaki Takeda; Osamu Sakurai; Takaaki Tsurumi
Key Engineering Materials, Volume：445, First page：140, Last page：143, Jul. 2010, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.445.140
DOI ID：10.4028/www.scientific.net/KEM.445.140, ISSN：1013-9826, ORCID：47804491, Web of Science ID：WOS:000291630900033

Dielectric Properties of Barium Titanate Ceramics with Nano-Sized Domain　　　　　　　　　　　　　　　
Yoichi Kigoshi; Saki Hatta; Takashi Teranishi; Takuya Hoshina; Hiroaki Takeda; Osamu Sakurai; Takaaki Tsururni
Key Engineering Materials, Volume：445, First page：27, Last page：30, Jul. 2010, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.445.27
DOI ID：10.4028/www.scientific.net/KEM.445.27, ISSN：1013-9826, ORCID：47804489, Web of Science ID：WOS:000291630900007

Growth and piezoelectric properties of ferroelectric Bi₂WO₆ mono-domain crystals　　　　　　　　　　　　　　　
Hiroaki Takeda; Joong Sang Han; Masaya Nishida; Tadashi Shiosaki; Takuya Hoshina; Takaaki Tsurumi
SOLID STATE COMMUNICATIONS, Volume：150, Number：17-18, First page：836, Last page：839, May 2010, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/j.ssc.2010.02.011
DOI ID：10.1016/j.ssc.2010.02.011, ISSN：0038-1098, eISSN：1879-2766, ORCID：47804499, Web of Science ID：WOS:000276781600008

Wide Band Dielectric Spectroscopy at Ferroelectric Phase Transition of BaTiO₃ Ceramics　　　　　　　　　　　　　　　
Takashi Teranishi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：49, Number：4, First page：0415061, Last page：0415064, Apr. 2010, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.49.041506
DOI ID：10.1143/JJAP.49.041506, ISSN：0021-4922, ORCID：47804507, Web of Science ID：WOS:000277300700030

Mechanism Underlying Stacking-Layer Effect of Dielectric Properties of Multilayer Ceramic Capacitors　　　　　　　　　　　　　　　
Satoshi Yokomizo; Takuya Hoshina; Hiroaki Takeda; Katsuya Taniguchi; Youichi Mizuno; Hirokazu Chazono; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：49, Number：4, First page：0415051, Last page：0415055, Apr. 2010, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.49.041505
DOI ID：10.1143/JJAP.49.041505, ISSN：0021-4922, ORCID：47804500, Web of Science ID：WOS:000277300700029

Dielectric tunability and electro-optic effect of Ba_0.5Sr_0.5TiO₃ thin films　　　　　　　　　　　　　　　
K. Takeda; T. Muraishi; T. Hoshina; H. Takeda; T. Tsurumi
JOURNAL OF APPLIED PHYSICS, Volume：107, Number：7, First page：074105, Apr. 2010, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1063/1.3371679
DOI ID：10.1063/1.3371679, ISSN：0021-8979, ORCID：47804490, Web of Science ID：WOS:000276795400064

Wide Range Dielectric Spectroscopy of Barium Strontium Titanate Ceramics　　　　　　　　　　　　　　　
Takashi Teranishi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
Key Engineering Materials, Volume：421-422, First page：273, Last page：276, Jan. 2010, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.421-422.273
DOI ID：10.4028/www.scientific.net/KEM.421-422.273, ISSN：1013-9826, ORCID：47804508, Web of Science ID：WOS:000279342100064

Preparation of (Ba_1-x,Sr_x)TiO₃ Thin Films on Glazed Alumina Substrate and Improvement of Temperature Dependence of Dielectric Properties　　　　　　　　　　　　　　　
Takashi Nozaka; Yoji Mizutani; Gun Bhakdisongkhram; Yuta Kawakami; Masahiro Echizen; Takashi Nishida; Hiroaki Takeda; Kiyoshi Uchiyama; Tadashi Shiosaki
Key Engineering Materials, Volume：421-422, First page：127, Last page：131, Jan. 2010, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.421-422.127
DOI ID：10.4028/www.scientific.net/KEM.421-422.127, ISSN：1013-9826, ORCID：47804503, Web of Science ID：WOS:000279342100030

Fabrication of Dielectric/Conductive Hybrid Artificial Superlattices using Molecular Beam Epitaxy Method　　　　　　　　　　　　　　　
Yu Yonezawa; Hiroyuki Kinbara; Hiroki Umehara; Hirofumi Kakemoto; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
Key Engineering Materials, Volume：421-422, First page：139, Last page：142, Jan. 2010, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.421-422.139
DOI ID：10.4028/www.scientific.net/KEM.421-422.139, ISSN：1013-9826, ORCID：47804497, Web of Science ID：WOS:000279342100033

Fabrication of PbTiO₃ Nanocrystals on Atomically Flat Sapphire Substrates by Sputtering　　　　　　　　　　　　　　　
Takashi Nishida; Koichi Kubo; Masahiro Echizen; Hiroaki Takeda; Kiyoshi Uchiyama; Tadashi Shiosaki
Key Engineering Materials, Volume：421-422, First page：502, Last page：505, Jan. 2010, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.421-422.502
DOI ID：10.4028/www.scientific.net/KEM.421-422.502, ISSN：1013-9826, ORCID：47804498, Web of Science ID：WOS:000279342100117

Fabrication and positive temperature coefficient of resistivity properties of semiconducting ceramics based on the BaTiO₃-(Bi_1/2K_1/2)TiO₃ system　　　　　　　　　　　　　　　
H. Takeda; H. Harinaka; T. Shiosaki; M. A. Zubair; C. Leach; R. Freer; T. Hoshina; T. Tsurumi
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Volume：30, Number：2, First page：555, Last page：559, Jan. 2010, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/j.jeurceramsoc.2009.08.009
DOI ID：10.1016/j.jeurceramsoc.2009.08.009, ISSN：0955-2219, ORCID：47804496, Web of Science ID：WOS:000272455600076

Effects of Pretreatments on deposition rate of Films in Aerosol Deposition Method　　　　　　　　　　　　　　　
Kensuke Mihara; Takuya Hoshina; Hirofumi Kakemoto; Hiroaki Takeda; Takaaki Tsurumi
Key Engineering Materials, Volume：421-422, First page：165, Last page：168, Jan. 2010, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.421-422.165
DOI ID：10.4028/www.scientific.net/KEM.421-422.165, ISSN：1013-9826, ORCID：47804494, Web of Science ID：WOS:000279342100039

Miniature Ultrasonic Motor Using Shear Mode of Potassium Sodium Niobate-Based Lead-Free Piezoelectric Ceramics　　　　　　　　　　　　　　　
Enzhu Li; Ryo Sasaki; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：48, Number：9, First page：09KD11, Sep. 2009, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.48.09KD11
DOI ID：10.1143/JJAP.48.09KD11, ISSN：0021-4922, ORCID：47804516, Web of Science ID：WOS:000270564800049

Domain Contribution to Dielectric Properties of Fine-Grained BaTiO₃ Ceramics　　　　　　　　　　　　　　　
Takuya Hoshina; Yoichi Kigoshi; Saki Hatta; Hiroaki Takeda; Takaaki Tsurumi
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：48, Number：9, First page：09KC01, Sep. 2009, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.48.09KC01
DOI ID：10.1143/JJAP.48.09KC01, ISSN：0021-4922, ORCID：47804513, Web of Science ID：WOS:000270564800028

Size Effect of Barium Titanate and Computer-Aided Design of Multilayered Ceramic Capacitors　　　　　　　　　　　　　　　
Takaaki Tsurumi; Takuya Hoshina; Hiroaki Takeda; Youichi Mizuno; Hirokazu Chazono
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Volume：56, Number：8, First page：1513, Last page：1522, Aug. 2009, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1109/TUFFC.2009.1214
DOI ID：10.1109/TUFFC.2009.1214, ISSN：0885-3010, eISSN：1525-8955, ORCID：47804519, Web of Science ID：WOS:000268553100003

Controlling factors of film-thickness in improved aerosol deposition method　　　　　　　　　　　　　　　
Kensuke Mihara; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：117, Number：1368, First page：868, Last page：872, Aug. 2009, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.117.868
DOI ID：10.2109/jcersj2.117.868, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804510, Web of Science ID：WOS:000268981400003

Ultrawideband dielectric spectroscopy of BaZr_xTi_1-xO₃ ceramics and its microscopic mechanism of polarization　　　　　　　　　　　　　　　
Takashi Teranishi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF APPLIED PHYSICS, Volume：105, Number：11, First page：114102, Jun. 2009, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1063/1.3131624
DOI ID：10.1063/1.3131624, ISSN：0021-8979, ORCID：47804520, Web of Science ID：WOS:000267053200111

Polarization behavior in diffuse phase transition of Ba_xSr_1-xTiO₃ ceramics　　　　　　　　　　　　　　　
Takashi Teranishi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
JOURNAL OF APPLIED PHYSICS, Volume：105, Number：5, First page：054111, Mar. 2009, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1063/1.3089250
DOI ID：10.1063/1.3089250, ISSN：0021-8979, eISSN：1089-7550, ORCID：47804517, Web of Science ID：WOS:000264156300079

Fabrication of PbTiO₃ Nanocrystals on Atomically Flat Sapphire Substrates by RF Magnetron Sputtering　　　　　　　　　　　　　　　
Takashi Nishida; Koichi Kubo; Hiroaki Takeda; Kiyoshi Uchiyama; Tadashi Shiosaki
FERROELECTRICS, Volume：381, Number：1 PART 2, First page：74, Last page：79, Mar. 2009, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1080/00150190902869681
DOI ID：10.1080/00150190902869681, ISSN：0015-0193, ORCID：47804515, Web of Science ID：WOS:000269689400011

Dielectric, piezoelectric, and electromechanical phenomena in (K_0.5Na_0.5)NbO₃-LiNbO₃-BiFeO₃-SrTiO₃ ceramics　　　　　　　　　　　　　　　
Enzhu Li; Ryo Suzuki; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
APPLIED PHYSICS LETTERS, Volume：94, Number：13, First page：132903, Mar. 2009, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1063/1.3112564
DOI ID：10.1063/1.3112564, ISSN：0003-6951, ORCID：47804512, Web of Science ID：WOS:000264888500040

Fabrication and operation limit of lead-free PTCR ceramics using BaTiO₃-(Bi_1/2Na_1/2)TiO₃ system　　　　　　　　　　　　　　　
Hiroaki Takeda; Takeshi Shimada; Yoshiaki Katsuyama; Tadashi Shiosaki
JOURNAL OF ELECTROCERAMICS, Volume：22, Number：1-3, First page：263, Last page：269, Feb. 2009, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1007/s10832-007-9398-6
DOI ID：10.1007/s10832-007-9398-6, ISSN：1385-3449, ORCID：47804514, Web of Science ID：WOS:000263498800045

Preparation of (Ba, Sr)TiO₃ Thin Films on Glazed Alumina Substrate and Analysis of Their Electric Properties　　　　　　　　　　　　　　　
Takashi Nozaka; Yoji Mizutani; Bhakdisonakhram Gun; Takuya Tsuchikawa
Key Engineering Materials, Volume：388, First page：191, Last page：194, Jan. 2009, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.388.191
DOI ID：10.4028/www.scientific.net/KEM.388.191, ISSN：1013-9826, ORCID：47804518, Web of Science ID：WOS:000263263800046

Dielectric, elastic and piezoelectric properties of RCa₄O(BO₃)₃ (R = rare-earth elements) crystals with monoclinic structure of point group m　　　　　　　　　　　　　　　
Hiroyuki Shimizu; Takashi Nishida; Hiroaki Takeda; Tadashi Shiosaki
JOURNAL OF CRYSTAL GROWTH, Volume：311, Number：3, First page：916, Last page：920, Jan. 2009, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/j.jcrysgro.2008.09.144
DOI ID：10.1016/j.jcrysgro.2008.09.144, ISSN：0022-0248, ORCID：47804511, Web of Science ID：WOS:000264161700118

Analysis of Nonlinear Dielectric Characteristics of (Ba, Sr)TiO₃ Thin Films and Their Frequency Conversion Application　　　　　　　　　　　　　　　
Takashi Nishida; Takashi Nozaka; Takuya Tsuchikawa; Masahiro Echizen; Hiroaki Takeda; Kiyoshi Uchiyama; Tadashi Shiosaki
Key Engineering Materials, Volume：388, First page：183, Last page：186, Jan. 2009, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.4028/0-87849-359-x.183
DOI ID：10.4028/0-87849-359-x.183, ISSN：1013-9826, ORCID：47804509, Web of Science ID：WOS:000263263800044

Heat-cycle endurance and in-plane thermal expansion of Al₂O₃/Al substrates formed by aerosol deposition method　　　　　　　　　　　　　　　
Ryo Sakamaki; Takuya Hoshina; Hirofumi Kakemoto; Kouichi Yasuda; Hiroaki Takeda; Jun Akedo; Takaaki Tsurumi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：116, Number：1360, First page：1299, Last page：1303, Dec. 2008, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj2.116.1299
DOI ID：10.2109/jcersj2.116.1299, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804527, Web of Science ID：WOS:000261427500010

Fabrication of lead-free and high T_c BaTiO₃-based thermistor ceramics using deoxidizing effect of oxygen-containing alpha-zirconium　　　　　　　　　　　　　　　
Hiroaki Takeda; Yoichiro Hoshi; Tsukuru Kinoshita; Toetsu Shishido; Takashi Nishida; Tadashi Shiosaki
CERAMICS INTERNATIONAL, Volume：34, Number：8, First page：2073, Last page：2077, Dec. 2008, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/j.ceramint.2007.08.009
DOI ID：10.1016/j.ceramint.2007.08.009, ISSN：0272-8842, ORCID：47804525, Web of Science ID：WOS:000260735500042

Annealing effects on the characteristics of high T_c lead-free barium titanate-based positive temperature coefficient of resistivity ceramics　　　　　　　　　　　　　　　
Ping-Hua Xiang; Hisashi Harinaka; Hiroaki Takeda; Takashi Nishida; Kiyoshi Uchiyama; Tadashi Shiosaki
JOURNAL OF APPLIED PHYSICS, Volume：104, Number：9, Nov. 2008, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1063/1.3013447
DOI ID：10.1063/1.3013447, ISSN：0021-8979, ORCID：47804521, Web of Science ID：WOS:000260941700094

Electro-optic anisotropy of epitaxially grown (Pb,La)(Zr,Ti)O₃ films fabricated by modified sol-gel process　　　　　　　　　　　　　　　
Masahiro Echizen; Takeshi Fujii; Takashi Nozaka; Takashi Nishida; Hiroaki Takeda; Kiyoshi Uchiyama; Tadashi Shiosaki
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：47, Number：9, First page：7545, Last page：7548, Sep. 2008, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.47.7545
DOI ID：10.1143/JJAP.47.7545, ISSN：0021-4922, ORCID：47804524, Web of Science ID：WOS:000259657800017

Effect of interface structure on electrical properties of (Ba,Sr)TiO₃ thin films on glazed alumina substrate　　　　　　　　　　　　　　　
Takashi Nozaka; Yoji Mizutani; Bhakdisongkhram Gun; Masahiro Echizen; Takashi Nishida; Hiroaki Takeda; Kiyoshi Uchiyama; Tadashi Shiosaki
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：47, Number：9, First page：7494, Last page：7499, Sep. 2008, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.47.7494
DOI ID：10.1143/JJAP.47.7494, ISSN：0021-4922, ORCID：47804523, Web of Science ID：WOS:000259657800006

Growth and piezoelectric properties of Al-substituted langasite-type La₃Nb_0.5Ga_5.5O₁₄ crystals　　　　　　　　　　　　　　　
Hiroaki Takeda; Tomoaki Kuze; Takashi Nishida; Kiyoshi Uchiyama; Tadashi Shiosaki
MATERIALS RESEARCH BULLETIN, Volume：43, Number：7, First page：1731, Last page：1736, Jul. 2008, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/j.materresbull.2007.07.029
DOI ID：10.1016/j.materresbull.2007.07.029, ISSN：0025-5408, ORCID：47804526, Web of Science ID：WOS:000257365900014

X-ray topography of piezoelectric La₃Ta_0.5Ga_5.5O₁₄ crystal grown by czochralski method　　　　　　　　　　　　　　　
Yasuhiro Yoneda; Jun'ichiro Mizuki; Hiroaki Takeda; Tadashi Shiosaki
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Volume：55, Number：5, First page：971, Last page：974, May 2008, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1109/TUFFC.2008.741
DOI ID：10.1109/TUFFC.2008.741, ISSN：0885-3010, ORCID：47804529, Web of Science ID：WOS:000255537600007

Polar laser dyes dispersed in polymer matrices: Reverification of charge transfer character and new optical functions　　　　　　　　　　　　　　　
Giseop Kwak; Chisato Okada; Michiya Fujiki; Hiroaki Takeda; Takashi Nishida; Tadashi Shiosaki
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：47, Number：3, First page：1753, Last page：1756, Mar. 2008, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.47.1753
DOI ID：10.1143/JJAP.47.1753, ISSN：0021-4922, ORCID：47804528, Web of Science ID：WOS:000255020100067

Characterization of manganese-doped BaTiO₃-(Bi_1/2Na_1/2)TiO₃ positive temperature coefficient of resistivity ceramics using impedance spectroscopy　　　　　　　　　　　　　　　
Ping-Hua Xiang; Hiroaki Takeda; Tadashi Shiosaki
JOURNAL OF APPLIED PHYSICS, Volume：103, Number：6, Mar. 2008, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1063/1.2884714
DOI ID：10.1063/1.2884714, ISSN：0021-8979, ORCID：47804522, Web of Science ID：WOS:000254536900088

Synthesis and characterization of PbTiO₃ Ferroelectric nanocrystals on atomically flat a-Al₂O₃ (0001) substrates by RE magnetron sputtering　　　　　　　　　　　　　　　
Koichi Kubo; Masahiro Echizen; Takashi Nishida; Hiroaki Takeda; Kiyoshi Uchiyama; Tadashi Shiosaki
Transactions of the Materials Research Society of Japan, Volume：33, Number：1, First page：69, Last page：72, Jan. 2008, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.14723/tmrsj.33.69
DOI ID：10.14723/tmrsj.33.69, ORCID：49173950, Web of Science ID：WOS:000263875700017

Structural and Electric Properties of (Ba, Sr)TiO₃ Thin Films on Glazed Alumina Substrate　　　　　　　　　　　　　　　
Takashi Nozaka; Takashi Nishida; Yoji Mizutani; Bhakdisongkhram Gun; Takuya Tsuchikawa; Masahiro Echizen; Hiroaki Takeda; Kiyoshi Uchiyama; Tadashi Shiosaki
Transactions of the Materials Research Society of Japan, Volume：33, Number：1, First page：65, Last page：68, Jan. 2008, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.14723/tmrsj.33.65
DOI ID：10.14723/tmrsj.33.65, ORCID：49173949, Web of Science ID：WOS:000263875700016

Influence of Light Irradiation on Electrical Properties of Lead Zirconate Titanate Film Capacitors　　　　　　　　　　　　　　　
Takashi Nishida; Takashi Nozaka; Masahiro Echizen; Hiroaki Takeda; Kiyoshi Uchiyama; Tadashi Shiosaki
Transactions of the Materials Research Society of Japan, Volume：33, Number：1, First page：61, Last page：64, Jan. 2008, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.14723/tmrsj.33.61
DOI ID：10.14723/tmrsj.33.61, ORCID：49173918, Web of Science ID：WOS:000263875700015

Syntheisis and characterization of bismuth tungstate crystals by solution growth technique　　　　　　　　　　　　　　　
Masaya Nishida; Hiroaki Takeda; Takashi Nishida; Tadashi Shiosaki
Key Engineering Materials, Volume：350, First page：81, Last page：84, Oct. 2007, [Reviewed], [Corresponding]
English, International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/KEM.350.81
DOI ID：10.4028/www.scientific.net/KEM.350.81, ISSN：1013-9826, ORCID：47804535, Web of Science ID：WOS:000250782100020

Preparation of (Pb,La)(Zr,Ti)O₃ epitaxial thin films by modified sol-gel method and their crystallinity evaluation　　　　　　　　　　　　　　　
Masahiro Echizen; Takashi Nishida; Takashi Nozaka; Hiroaki Takeda; Kiyoshi Uchiyama; Tadashi Shiosaki
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, Volume：46, Number：10B, First page：6933, Last page：6937, Oct. 2007, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.46.6933
DOI ID：10.1143/JJAP.46.6933, ISSN：0021-4922, ORCID：47804534, Web of Science ID：WOS:000250790200006

Positive temperature coefficient of resistivity effect of semiconducting BaTiO₃-(Bi_1/2Na_1/2)TiO₃ ceramics prepared by a wet-chemistry route　　　　　　　　　　　　　　　
Ping-Hua Xiang; Hiroaki Takeda; Tadashi Shiosaki
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, Volume：46, Number：10B, First page：6995, Last page：6998, Oct. 2007, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.46.6995
DOI ID：10.1143/JJAP.46.6995, ISSN：0021-4922, ORCID：47804533, Web of Science ID：WOS:000250790200020

High T_c lead-free BaTiO₃-(Bi_1/2Na_1/2)TiO₃ positive temperature coefficient of resistivity ceramics with electrically heterogeneous structure　　　　　　　　　　　　　　　
Ping-Hua Xiang; Hiroaki Takeda; Tadashi Shiosaki
APPLIED PHYSICS LETTERS, Volume：91, Number：16, First page：162904, Oct. 2007, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1063/1.2799878
DOI ID：10.1063/1.2799878, ISSN：0003-6951, ORCID：47804531, Web of Science ID：WOS:000250295700060

Difference between local and average. structures of La₃Ga₅SiO₁₄ crystal　　　　　　　　　　　　　　　
Yasuhiro Yoneda; Hiroaki Takeda; Tadashi Shiosaki; Jun'ichiro Mizuki
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, Volume：46, Number：10B, First page：7163, Last page：7166, Oct. 2007, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.46.7163
DOI ID：10.1143/JJAP.46.7163, ISSN：0021-4922, ORCID：47804530, Web of Science ID：WOS:000250790200059

Lead free PTCR ceramics and its electrical properties　　　　　　　　　　　　　　　
T. Shimada; K. Touji; Y. Katsuyama; Hiroaki Takeda; Tadashi Shiosaki
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Volume：27, Number：13-15, First page：3877, Last page：3882, May 2007, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/j.jeurceramsoc.2007.02.171
DOI ID：10.1016/j.jeurceramsoc.2007.02.171, ISSN：0955-2219, ORCID：47804532, Web of Science ID：WOS:000248822800064

Growth of bismuth tungstate Bi2WO6 mono-domain crystals and chemical etching for measuring their electrical properties　　　　　　　　　　　　　　　
Takeda Hiroaki; Nishida Masaya; Nishida Takashi; Shiosaki Tadashi
Transactions of the Materials Research Society of Japan, Volume：32, Number：1, First page：11, Last page：14, Jan. 2007, [Reviewed], [Lead, Corresponding]
ORCID：49173951

Growth and electric properties of Al-substituted langasite-type La₃Ta_0.5Ga_5.5O₁₄ crystals at high temperature　　　　　　　　　　　　　　　
Hiroaki Takeda; Satoshi Tanaka; Hiroyuki Shimizu; Takashi Nishida; Tadashi Shiosaki
Key Engineering Materials, Volume：320, First page：239, Last page：242, Sep. 2006, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.4028/0-87849-411-1.239
DOI ID：10.4028/0-87849-411-1.239, ISSN：1013-9826, ORCID：47804536, Web of Science ID：WOS:000241412900057

Growth and piezoelectric properties of R₃Ga₅SiO₁₄ and RCa₄O(BO₃)₃ (R: rare-earth elements) single crystals　　　　　　　　　　　　　　　
H Takeda; H Nakao; S Izukawa; H Shimizu; T Nishida; S Okamura; T Shiosaki
JOURNAL OF ALLOYS AND COMPOUNDS, Volume：408, First page：474, Last page：479, Feb. 2006, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/j.jallcom.2004.12.108
DOI ID：10.1016/j.jallcom.2004.12.108, ISSN：0925-8388, ORCID：47804537, Web of Science ID：WOS:000235445300111

Growth and SAW properties of rare-earth calcium oxoborate crystals　　　　　　　　　　　　　　　
H Nakao; M Nishida; T Shikida; H Shimizu; H Takeda; T Shiosaki
JOURNAL OF ALLOYS AND COMPOUNDS, Volume：408, First page：582, Last page：585, Feb. 2006, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/j.jallcom.2004.12.153
DOI ID：10.1016/j.jallcom.2004.12.153, ISSN：0925-8388, ORCID：47804538, Web of Science ID：WOS:000235445300133

X-ray topography on piezoelectric La₃Ga₅SiO₁₄ single crystal
Yasuhiro Yoneda; Yuka Okajima; Hiroaki Takeda; Tadashi Shiosaki; Jun'ichiro Mizuki
Transactions of the Materials Research Society of Japan, Volume：31, Number：1, First page：7, Last page：11, Jan. 2006, [Reviewed]
English, International conference proceedings
ORCID：49173953, Web of Science ID：WOS:000240547200002

Growth and characterization of langasite-type single crystals substituted with aluminum to the solubility limit
Hiroaki Takeda; Satoshi Tanaka; Tadashi Nishida; Kiyoshi Uchiyama; Tadashi Shiosaki
Transactions of the Materials Research Society of Japan, Volume：31, Number：1, First page：11, Last page：14, Jan. 2006, [Reviewed], [Lead, Corresponding]
English, International conference proceedings
ORCID：49173952, Web of Science ID：WOS:000240547200003

Estimation of parasitic capacitance in measurement of hysteresis properties of ferroelectric microcapacitors using scanning probe microscope　　　　　　　　　　　　　　　
S Okamura; T Iwase; H Takeda; T Nishida; T Shiosaki
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, Volume：44, Number：11, First page：8062, Last page：8065, Nov. 2005, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.44.8062
DOI ID：10.1143/JJAP.44.8062, ISSN：0021-4922, ORCID：47804544, Web of Science ID：WOS:000233437400067

Dielectric, elastic and piezoelectric constants of lanthanum calcium oxoborate single crystals with monoclinic structure of point group m　　　　　　　　　　　　　　　
H Shimizu; T Nishida; M Nishida; H Takeda; T Shiosaki
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, Volume：44, Number：9B, First page：7059, Last page：7063, Sep. 2005, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.44.7059
DOI ID：10.1143/JJAP.44.7059, ISSN：0021-4922, ORCID：47804541, Web of Science ID：WOS:000232570700044

BaTiO₃-(Bi_1/2Na_1/2)TiO₃ solid-solution semiconducting ceramics with T_c > 130^oC　　　　　　　　　　　　　　　
H Takeda; W Aoto; T Shiosaki
APPLIED PHYSICS LETTERS, Volume：87, Number：10, First page：102104, Sep. 2005, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1063/1.2042551
DOI ID：10.1063/1.2042551, ISSN：0003-6951, ORCID：47804539, Web of Science ID：WOS:000231614800030

Enhanced piezoelectric properties of off-stoichiometric strontium bismuth tantalate Sr_0.8Bi_2.2Ta₂O₉ ceramics　　　　　　　　　　　　　　　
H Takeda; C Fujioka; R Aoyagi; S Okamura; T Shiosaki
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, Volume：81, Number：1, First page：131, Last page：135, Jun. 2005, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1007/s00339-004-3073-4
DOI ID：10.1007/s00339-004-3073-4, ISSN：0947-8396, ORCID：47804543, Web of Science ID：WOS:000228794000022

Crystal growth of bismuth tungstate Bi₂WO₆ by slow cooling method using borate fluxes　　　　　　　　　　　　　　　
H Takeda; T Nishida; S Okamura; T Shiosaki
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Volume：25, Number：12, First page：2731, Last page：2734, Apr. 2005, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/j.jeurceramsoc.2005.03.184
DOI ID：10.1016/j.jeurceramsoc.2005.03.184, ISSN：0955-2219, ORCID：47804540, Web of Science ID：WOS:000230569300156

Effect of non-stoichiometry on ferroelectricity and piezoelectricity in strontium bismuth tantalate ceramics　　　　　　　　　　　　　　　
C Fujioka; R Aoyagi; H Takeda; S Okamura; T Shiosaki
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Volume：25, Number：12, First page：2723, Last page：2726, Mar. 2005, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/j.jeurceramsoc.2005.03.129
DOI ID：10.1016/j.jeurceramsoc.2005.03.129, ISSN：0955-2219, ORCID：47804542, Web of Science ID：WOS:000230569300154

Growth, Structure and Piezoelectric Properties of Ln3Ga5SiO14 (Ln= La, Nd) Single Crystals　　　　　　　　　　　　　　　
Takeda Hiroaki; Izukawa Shintaro; Shimizu Hiroyuki; Nishida Takashi; Okamura Soishiro; Shiosaki Tadashi
Transactions of the Materials Research Society of Japan, Volume：30, First page：63, Last page：66, Jan. 2005, [Reviewed], [Lead, Corresponding]
ORCID：49173954

Ferroelectric and piezoelectric properties of bismuth layered-structure ferroelectric (Sr,Na,Bi)Bi₂Ta₂O₉ ceramics　　　　　　　　　　　　　　　
R Aoyagi; H Takeda; S Okamura; T Shiosaki
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, Volume：116, Number：2, First page：156, Last page：160, Jan. 2005, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/j.mseb.2004.09.025
DOI ID：10.1016/j.mseb.2004.09.025, ISSN：0921-5107, ORCID：47804545, Web of Science ID：WOS:000226257200009

Piezoelectric properties of sodium bismuth tantalate Na_0.5Bi_2.5Ta₂O₉ dense ceramics　　　　　　　　　　　　　　　
M Matsushita; R Aoyagi; H Takeda; S Okamura; T Shiosaki
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, Volume：43, Number：10, First page：7164, Last page：7168, Oct. 2004, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.43.7164
DOI ID：10.1143/JJAP.43.7164, ISSN：0021-4922, ORCID：47804550, Web of Science ID：WOS:000224780300068

Evaluation of material constants and temperature properties in lanthanum calcium oxoborate LaCa₄O(BO₃)₃ single crystals　　　　　　　　　　　　　　　
H Shimizu; K Kodama; H Takeda; T Nishida; T Shikida; S Okamura; T Shiosaki
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, Volume：43, Number：9B, First page：6716, Last page：6720, Sep. 2004, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.43.6716
DOI ID：10.1143/JJAP.43.6716, ISSN：0021-4922, ORCID：47804547, Web of Science ID：WOS:000224736400044

Growth and characterization of piezoelectric Ba₃TaGa₃Si₂O₁₄ single crystals
H Takeda; S Izukawa; S Okamura; T Shiosaki
Key Engineering Materials, Volume：269, First page：23, Last page：26, Aug. 2004, [Reviewed], [Lead, Corresponding]
English, Scientific journal
ISSN：1013-9826, ORCID：47804549, Web of Science ID：WOS:000224025500006

Piezoelectric Properties of Strontium Bismuth Tantalate Sr_xBi_3-xTa₂O₉ Dense Ceramics
Takeda Hiroaki; Fujioka Chie; Aoyagi Rintaro; Okamura Soichiro; Shiosaki Tadashi
Journal of the Ceramic Society of Japan, Supplement, Volume：112, First page：S510, Last page：S513, May 2004, [Reviewed], [Lead, Corresponding]
DOI：https://doi.org/10.14852/jcersjsuppl.112.0.S510.0
DOI ID：10.14852/jcersjsuppl.112.0.S510.0, ORCID：47804551

Ferroelectric and piezoelectric properties of strontium bismuth tantalate ceramics　　　　　　　　　　　　　　　
H Takeda; C Fujioka; R Aoyagi; S Okamura; T Shiosaki
Key Engineering Materials, Volume：264-268, First page：1169, Last page：1172, May 2004, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.4028/www.scientific.net/KEM.264-268.1169
DOI ID：10.4028/www.scientific.net/KEM.264-268.1169, ISSN：1013-9826, ORCID：47804548, Web of Science ID：WOS:000223059700276

Electrical properties of Na_0.5Bi_2.5Ta₂O₉-Sr_1-xBi_2+yTa₂O₉ solid solution ceramics　　　　　　　　　　　　　　　
H Takeda; R Aoyagi; S Okamura; T Shiosaki
Key Engineering Materials, Volume：264-268, First page：1241, Last page：1244, May 2004, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.4028/www.scientific.net/KEM.264-268.1241
DOI ID：10.4028/www.scientific.net/KEM.264-268.1241, ISSN：1013-9826, ORCID：47804546, Web of Science ID：WOS:000223059700294

Growth and characterization of lanthanum calcium oxoborate LaCa₄O(BO₃)₃ single crystals　　　　　　　　　　　　　　　
H Takeda; H Sako; H Shimizu; K Kodama; M Nishida; H Nakao; T Nishida; S Okamura; T Shikida; T Shiosaki
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, Volume：42, Number：9B, First page：6081, Last page：6085, Sep. 2003, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1143/jjap.42.6081
DOI：https://doi.org/10.1143/JJAP.42.6081
DOI ID：10.1143/jjap.42.6081, ISSN：0021-4922, ORCID：47804554, Web of Science ID：WOS:000186948300042

Cation distribution and melting behavior of La₃Ga₅M⁴⁺O₁₄ (M = Si, Ti, Ge, Zr, Sn, and Hf) crystals　　　　　　　　　　　　　　　
H Takeda; R Aoyagi; S Okamura; T Shiosaki
FERROELECTRICS, Volume：295, First page：661, Last page：670, Jun. 2003, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1080/00150190390239396
DOI ID：10.1080/00150190390239396, ISSN：0015-0193, ORCID：47804552, Web of Science ID：WOS:000186527400009

Influence of a TiO₂ adhesion layer on the structure and the orientation of a Pt layer in Pt/TiO₂/SiO₂/Si structures　　　　　　　　　　　　　　　
N Abe; Y Otani; M Miyake; M Kurita; H Takeda; S Okamura; T Shiosaki
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, Volume：42, Number：5A, First page：2791, Last page：2795, May 2003, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.42.2791
DOI ID：10.1143/JJAP.42.2791, ISSN：0021-4922, ORCID：47804555, Web of Science ID：WOS:000183744900051

Crystal structure and electromechanical coupling properties of Na_0.5Bi_2.5Ta₂O₉ dense ceramics　　　　　　　　　　　　　　　
H Takeda; R Aoyagi; M Matsushita; T Shiosaki
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, Volume：76, Number：2, First page：295, Last page：297, Feb. 2003, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1007/s00339-002-1714-z
DOI ID：10.1007/s00339-002-1714-z, ISSN：0947-8396, ORCID：47804553, Web of Science ID：WOS:000179782000030

Synthesis and electrical properties of sodium bismuth niobate Na_0.5Bi_2.5Nb₂O₉　　　　　　　　　　　　　　　
R Aoyagi; H Takeda; S Okamura; T Shiosaki
MATERIALS RESEARCH BULLETIN, Volume：38, Number：1, First page：25, Last page：32, Jan. 2003, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/S0025-5408(02)01001-2
DOI ID：10.1016/S0025-5408(02)01001-2, ISSN：0025-5408, eISSN：1873-4227, ORCID：47804556, Web of Science ID：WOS:000180718200004

Synthesis and characterization of Ba₃MeGa₃Si₂O₁₄ (Me=Nb⁵⁺, Ta⁵⁺) crystal　　　　　　　　　　　　　　　
Takeda Hiroaki; Nishida Takashi; Okamura Soichiro; Shiosaki Tadashi
Transactions of the Materials Research Society of Japan, Volume：28, Number：1, First page：181, Last page：184, Jan. 2003, [Reviewed], [Lead, Corresponding]
ORCID：49173955

Evaluation of electrical polarizability and in vitro bioactivity of apatite Sr₅(PO₄)₃OH dense ceramics　　　　　　　　　　　　　　　
H Takeda; Y Seki; S Nakamura; K Yamashita
JOURNAL OF MATERIALS CHEMISTRY, Volume：12, Number：8, First page：2490, Last page：2495, Aug. 2002, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1039/b202262c
DOI ID：10.1039/b202262c, ISSN：0959-9428, ORCID：47804558, Web of Science ID：WOS:000177525600064

Chemical etching of lanthanum gallium silicate La₃Ga₅SiO₁₄ single crystals　　　　　　　　　　　　　　　
H Takeda; S Okamura; T Shiosaki
JOURNAL OF MATERIALS SCIENCE LETTERS, Volume：21, Number：14, First page：1117, Last page：1119, Jul. 2002, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1023/A:1016566718494
DOI ID：10.1023/A:1016566718494, ISSN：0261-8028, ORCID：47804557, Web of Science ID：WOS:000177007600014

Synthesis and ferroelectric properties of M_0.5Bi_2.5Ta₂O₉ (M = Na, K) ceramics　　　　　　　　　　　　　　　
K Komagata; H Takeda; T Shiosaki
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：110, Number：4, First page：255, Last page：258, Apr. 2002, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.2109/jcersj.110.255
DOI ID：10.2109/jcersj.110.255, ISSN：1882-0743, eISSN：1348-6535, ORCID：47804561, Web of Science ID：WOS:000178328100009

Structure and piezoelectric properties of Al-substituted langasite (La₃Ga_5-xAl_xSiO₁₄) crystals
H Takeda; M Kumatoriya; T Shiosaki
Key Engineering Materials, Volume：216, First page：43, Last page：46, Jan. 2002, [Reviewed], [Lead, Corresponding]
English, Scientific journal
ISSN：1013-9826, ORCID：47804566, Web of Science ID：WOS:000172619400011

Synthesis and electric properties of (Na,Bi)Bi₂Ta₂O₉ ceramics with bismuth layer-structure
K Komagata; H Takeda; S Okamura; T Shiosaki
Key Engineering Materials, Volume：228-229, First page：215, Last page：218, Jan. 2002, [Reviewed], [Corresponding]
English, Scientific journal
ISSN：1013-9826, ORCID：47804560, Web of Science ID：WOS:000177771700037

Influence of Bi-contents on electric properties of strontium bismuth tantalate ceramics
K Komagata; S Okamura; H Takeda; T Shiosaki
Key Engineering Materials, Volume：228-229, First page：219, Last page：222, Jan. 2002, [Reviewed]
English, Scientific journal
ISSN：1013-9826, ORCID：47804559, Web of Science ID：WOS:000177771700038

Effect of aluminum substitution in La₃Ga₅SiO₁₄ crystals on their structure and piezoelectricity　　　　　　　　　　　　　　　
H Takeda; M Kumatoriya; T Shiosaki
APPLIED PHYSICS LETTERS, Volume：79, Number：25, First page：4201, Last page：4203, Dec. 2001, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1063/1.1426274
DOI ID：10.1063/1.1426274, ISSN：0003-6951, ORCID：47804563, Web of Science ID：WOS:000172682300044

Crystal growth and characterization of lanthanum substituted bismuth titanate single crystals　　　　　　　　　　　　　　　
R Aoyagi; H Takeda; S Okamura; T Shiosaki
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, Volume：40, Number：9B, First page：5671, Last page：5674, Sep. 2001, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.40.5671
DOI ID：10.1143/JJAP.40.5671, ISSN：0021-4922, ORCID：47804562, Web of Science ID：WOS:000172075600041

Proton transport polarization and depolarization of hydroxyapatite ceramics　　　　　　　　　　　　　　　
S Nakamura; H Takeda; K Yamashita
JOURNAL OF APPLIED PHYSICS, Volume：89, Number：10, First page：5386, Last page：5392, May 2001, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1063/1.1357783
DOI ID：10.1063/1.1357783, ISSN：0021-8979, ORCID：47804565, Web of Science ID：WOS:000168438400021

Effect of starting melt composition on growth of La₃Ta_0.5Ga_5.5O₁₄ crystal　　　　　　　　　　　　　　　
H Takeda; T Fukuda; H Kawanaka; N Onozato
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, Volume：12, Number：3, First page：199, Last page：202, Mar. 2001, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1023/A:1011243219013
DOI ID：10.1023/A:1011243219013, ISSN：0957-4522, ORCID：47804564, Web of Science ID：WOS:000168886100011

Formation mechanism and synthesis of apatite-type structure Ba_2+xLa_8-x(SiO₄)₆O_2-d　　　　　　　　　　　　　　　
H Takeda; M Ohgaki; T Kizuki; K Hashimoto; Y Toda; S Udagawa; K Yamashita
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Volume：83, Number：11, First page：2884, Last page：2886, Nov. 2000, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1111/j.1151-2916.2000.tb01654.x
DOI ID：10.1111/j.1151-2916.2000.tb01654.x, ISSN：0002-7820, ORCID：47804569, Web of Science ID：WOS:000165235600046

Crystal growth and structure analysis of Sm_2-xCe_xCuO₄　　　　　　　　　　　　　　　
H Takeda; M Okuno; M Ohgaki; K Yamashita; T Matsumoto
JOURNAL OF MATERIALS RESEARCH, Volume：15, Number：9, First page：1905, Last page：1910, Sep. 2000, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1557/JMR.2000.0276
DOI ID：10.1557/JMR.2000.0276, ISSN：0884-2914, ORCID：47804567, Web of Science ID：WOS:000089112800010

HOMO- AND HETERO- CRYSTAL GROWTH PHENOMENA ON ELECTRICALLY POLED HYDROXYAPATITE CERAMIC SURFACES
Takeda Hiroaki; Nakamura Satoshi; Yamashita Kimihiro
Phosphorus Research Bulletin, Volume：11, First page：7, Last page：12, May 2000, [Reviewed], [Lead, Corresponding]
DOI：https://doi.org/10.3363/prb1992.11.0_7
DOI ID：10.3363/prb1992.11.0_7, ORCID：47804570

Dielectric properties of poled hydroxyapatite ceramics　　　　　　　　　　　　　　　
H Takeda; S Nakamura; K Yamada; T Tsuchiya; K Yamashita
Key Engineering Materials, Volume：181-182, First page：35, Last page：38, May 2000, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.4028/www.scientific.net/KEM.181-182.35
DOI ID：10.4028/www.scientific.net/KEM.181-182.35, ISSN：1013-9826, ORCID：47804568, Web of Science ID：WOS:000165526800009

Synthesis and characterization of Sr₃TaGa₃Si₂O₁₄ single crystals　　　　　　　　　　　　　　　
H Takeda; J Sato; T Kato; K Kawasaki; H Morikoshi; K Shimamura; T Fukuda
MATERIALS RESEARCH BULLETIN, Volume：35, Number：2, First page：245, Last page：252, Jan. 2000, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/S0025-5408(00)00201-4
DOI ID：10.1016/S0025-5408(00)00201-4, ISSN：0025-5408, ORCID：47804571, Web of Science ID：WOS:000087423700011

Electrovectorial Effect of Poled Bioceramics on Dissolution and Crystallization　　　　　　　　　　　　　　　
Takeda Hiroaki; Yamashita Kimihiro
Transactions of the Materials Research Society of Japan, Volume：25, Number：1, First page：173, Last page：176, Jan. 2000, [Reviewed], [Lead, Corresponding]
ORCID：49173956

Synthesis and structure of La₃(M_1/3Ga_2/3)Ga₅O₁₄ (M = Mo⁶⁺ and W⁶⁺) crystals　　　　　　　　　　　　　　　
H Takeda; J Sato; H Morikoshi; T Kato; K Shimamura; T Fukuda
MATERIALS LETTERS, Volume：41, Number：3, First page：104, Last page：111, Nov. 1999, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/S0167-577X(99)00112-3
DOI ID：10.1016/S0167-577X(99)00112-3, ISSN：0167-577X, ORCID：47804578, Web of Science ID：WOS:000083653300003

Crystal growth of oxide and fluoride materials for optical, piezoelectric and other applications　　　　　　　　　　　　　　　
T Fukuda; K Shimamura; VV Kochurikhin; VI Chani; BM Epelbaum; SL Baldochi; H Takeda; A Yoshikawa
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, Volume：10, Number：8, First page：571, Last page：580, Nov. 1999, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1023/A:1008933507409
DOI ID：10.1023/A:1008933507409, ISSN：0957-4522, ORCID：47804573, Web of Science ID：WOS:000083599000003

Effect of starting melt composition on crystal growth of La₃Nb_0.5Ga_5.5O₁₄　　　　　　　　　　　　　　　
H Takeda; K Shimamura; VI Chani; T Kato; T Fukuda
CRYSTAL RESEARCH AND TECHNOLOGY, Volume：34, Number：9, First page：1141, Last page：1147, Oct. 1999, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1002/(SICI)1521-4079(199911)34:9<1141::AID-CRAT1141>3.0.CO;2-W
DOI ID：10.1002/(SICI)1521-4079(199911)34:9<1141::AID-CRAT1141>3.0.CO;2-W, ISSN：0232-1300, ORCID：47804576, Web of Science ID：WOS:000083814500004

Effect of (Sr, Ba) substitution in La₃Ga₅SiO₁₄ and La₃M_0.5Ga_5.5O₁₄ (M = Nb⁵⁺, Ta⁵⁺) crystals on their synthesis, structure and piezoelectricity　　　　　　　　　　　　　　　
H Takeda; T Kato; Chani, VI; H Morikoshi; K Shimamura; T Fukuda
JOURNAL OF ALLOYS AND COMPOUNDS, Volume：290, Number：1-2, First page：79, Last page：84, Aug. 1999, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/S0925-8388(99)00203-0
DOI ID：10.1016/S0925-8388(99)00203-0, ISSN：0925-8388, ORCID：47804574, Web of Science ID：WOS:000082380800016

Crystal growth and structure of La₃M⁴⁺Ga₅O₁₄ (M=Ti, Zr, Hf)　　　　　　　　　　　　　　　
H Takeda; T Kato; VI Chani; K Shimamura; T Fukuda
JOURNAL OF ALLOYS AND COMPOUNDS, Volume：290, Number：1-2, First page：244, Last page：249, Aug. 1999, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/S0925-8388(99)00194-2
DOI ID：10.1016/S0925-8388(99)00194-2, ISSN：0925-8388, ORCID：47804572, Web of Science ID：WOS:000082380800040

New oxide crystals as substrate for GaN-based blue light emitting devices　　　　　　　　　　　　　　　
Tsuguo Fukuda; Kiyoshi Shimamura; T. Tabata; Hiroaki Takeda; N. Futagawa; Akira Yoshikawa; Vladimir V. Kochurikhin
Journal of Korean Association of Crystal Growth, Volume：9, Number：5, First page：470, Last page：474, Jun. 1999, [Reviewed]

Liquid phase epitaxy of films with langasite structure　　　　　　　　　　　　　　　
VI Chani; H Takeda; T Fukuda
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, Volume：60, Number：3, First page：212, Last page：216, Jun. 1999, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/S0921-5107(99)00141-5
DOI ID：10.1016/S0921-5107(99)00141-5, ISSN：0921-5107, ORCID：47804577, Web of Science ID：WOS:000081345900010

Effect of starting melt composition on crystal growth of La₃Ga₅SiO₁₄　　　　　　　　　　　　　　　
H Takeda; K Shimamura; VI. Chani; T Fukuda
JOURNAL OF CRYSTAL GROWTH, Volume：197, Number：1-2, First page：204, Last page：209, Feb. 1999, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/S0022-0248(98)00814-8
DOI ID：10.1016/S0022-0248(98)00814-8, ISSN：0022-0248, ORCID：47804575, Web of Science ID：WOS:000078355300030

Application of spectral analysis for crystal shape improvement during czochralski growth of oxide crystals　　　　　　　　　　　　　　　
VV Kochurikhin; K Shimamura; BM Epelbaum; H Takeda; T Fukuda
CRYSTAL RESEARCH AND TECHNOLOGY, Volume：33, Number：1, First page：65, Last page：70, Dec. 1998, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1002/(SICI)1521-4079(1998)33:1<65::AID-CRAT65>3.0.CO;2-S
DOI ID：10.1002/(SICI)1521-4079(1998)33:1<65::AID-CRAT65>3.0.CO;2-S, ISSN：0232-1300, ORCID：47804583, Web of Science ID：WOS:000071885600008

Growth of Gd-Yb-Ga garnet single crystals with large lattice parameters as substrates for optical isolators　　　　　　　　　　　　　　　
K Shimamura; VV Kochurikhin; H Takeda; T Fukuda
JOURNAL OF CRYSTAL GROWTH, Volume：194, Number：2, First page：203, Last page：208, Nov. 1998, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/S0022-0248(98)00689-7
DOI ID：10.1016/S0022-0248(98)00689-7, ISSN：0022-0248, ORCID：47804582, Web of Science ID：WOS:000077077400007

Growth and characterization of (La,Sr)(Al,Ta)O₃ single crystals as substrates for GaN epitaxial growth　　　　　　　　　　　　　　　
K Shimamura; H Tabata; H Takeda; VV Kochurikhin; T Fukuda
JOURNAL OF CRYSTAL GROWTH, Volume：194, Number：2, First page：209, Last page：213, Nov. 1998, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/S0022-0248(98)00730-1
DOI ID：10.1016/S0022-0248(98)00730-1, ISSN：0022-0248, ORCID：47804580, Web of Science ID：WOS:000077077400008

Czochralski growth of RE₃Ga₅SiO₁₄ (RE = La, Pr, Nd) single crystals for the analysis of the influence of rare earth substitution on piezoelectricity　　　　　　　　　　　　　　　
J Sato; H Takeda; H Morikoshi; K Shimamura; P Rudolph; T Fukuda
JOURNAL OF CRYSTAL GROWTH, Volume：191, Number：4, First page：746, Last page：753, Aug. 1998, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/S0022-0248(98)00362-5
DOI ID：10.1016/S0022-0248(98)00362-5, ISSN：0022-0248, eISSN：1873-5002, ORCID：47804579, Web of Science ID：WOS:000075688600022

Growth and characterization of La₃Ta_0.5Ga_5.5O₁₄ single crystals　　　　　　　　　　　　　　　
H Kawanaka; H Takeda; K Shimamura; T Fukuda
JOURNAL OF CRYSTAL GROWTH, Volume：183, Number：1-2, First page：274, Last page：277, Jan. 1998, [Reviewed]
English
DOI：https://doi.org/10.1016/S0022-0248(97)00481-8
DOI ID：10.1016/S0022-0248(97)00481-8, ISSN：0022-0248, ORCID：47804581, Web of Science ID：WOS:000071255000035

Crystal growth and structural characterization of new piezoelectric material La₃Ta_0.5Ga_5.5O₁₄　　　　　　　　　　　　　　　
H. Takeda; K. Sugiyama; K. Inaba; K. Shimamura; T. Fukuda
Japanese Journal of Applied Physics Part 2-Letters, Volume：36, Number：7B, First page：L919, Last page：L921, Jul. 1997, [Reviewed], [Lead, Corresponding]
Scientific journal
DOI：https://doi.org/10.1143/JJAP.36.L919
DOI ID：10.1143/JJAP.36.L919, ORCID：47804584, Web of Science ID：WOS:A1997XM98300009

Growth and characterization of Na₂CaGe₆O₁₄ single crystals　　　　　　　　　　　　　　　
H Takeda; R Uecker; M Kumatoriya; K Shimamura; P Reiche; T Fukuda
CRYSTAL RESEARCH AND TECHNOLOGY, Volume：32, Number：7, First page：939, Last page：945, Jul. 1997, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1002/crat.2170320707
DOI ID：10.1002/crat.2170320707, ISSN：0232-1300, ORCID：47804585, Web of Science ID：WOS:A1997YK40600006

Growth and characterization of La₃Nb_0.5Ga_5.5O₁₄ single crystals　　　　　　　　　　　　　　　
H Takeda; K Shimamura; T Kohno; T Fukuda
JOURNAL OF CRYSTAL GROWTH, Volume：169, Number：3, First page：503, Last page：508, Dec. 1996, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1016/S0022-0248(96)00435-6
DOI ID：10.1016/S0022-0248(96)00435-6, ISSN：0022-0248, ORCID：47804586, Web of Science ID：WOS:A1996VZ79000015

Growth and characterization of lanthanum gallium silicate La₃Ga₅SiO₁₄ single crystals for piezoelectric applications　　　　　　　　　　　　　　　
K Shimamura; H Takeda; T Kohno; T Fukuda
JOURNAL OF CRYSTAL GROWTH, Volume：163, Number：4, First page：388, Last page：392, Jun. 1996, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/0022-0248(95)01002-5
DOI ID：10.1016/0022-0248(95)01002-5, ISSN：0022-0248, ORCID：47804587, Web of Science ID：WOS:A1996UW51100007

新圧電結晶ランガサイト
福田承生; 島村清史; 光野卓也; 武田博明; 佐藤充
Volume：22, Number：5, First page：358, Last page：363, 1995, [Reviewed]
DOI：https://doi.org/10.19009/jjacg.22.5_358
DOI ID：10.19009/jjacg.22.5_358, ORCID：47804588

■ MISC

Control of thermophysical properties of La₃Ta_0.5Ga_5.5O₁₄ crystal by Sr substitution　　　　　　　　　　　　　　　
武田博明; 蕎麦田雄大; 臼井晴紀; 徳田誠; 杉山和正; 小玉翔平; 柳瀬郁夫; 保科拓也; 鶴見敬章; VILLORA Encarnacion G.; 島村清史
結晶成長国内会議予稿集(CD-ROM), Volume：50th, 2021
ISSN：0385-6275, J-Global ID：202202222663219101

Effect of element substitution on thermophysical properties of langasite-type crystal　　　　　　　　　　　　　　　
臼井晴紀; 徳田誠; 保科拓也; 鶴見敬章; 杉山和正; LEBBOU Kheirreddine; 武田博明
日本セラミックス協会年会講演予稿集(CD-ROM), Volume：2020, 2020
J-Global ID：202002279944019417

四成分系ランガサイト型結晶の構造と物性　　　　　　　　　　　　　　　
武田博明; 臼井晴紀; 保科拓也; 鶴見敬章; 杉山和正; 徳田誠
Volume：2019, 2019
J-Global ID：202002252628576978

Structural changes on russellite by HCl treatment　　　　　　　　　　　　　　　
Sakai Yuka; Okudera Hiroki; Arasuna Akane; Takeda Hiroaki
Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences, Volume：2017, First page：87, 2017
By comparing structures of russellite before and after HCl treatment we found shrinkage of b, relaxations in tilt of WO₆ octahedra and shift of W along -c within one of O₄ squares normal to b. Change in IR spectra suggested that HCl treatment straighten the O-W-O sequence without changing the distance of diagonal oxygen atoms, in harmony with the X-ray result. Presence of water-attributable absorption band indicate presence of physisorption sites on the surface of powdery specimen.
Japan Association of Mineralogical Sciences, Japanese
DOI：https://doi.org/10.14824/jakoka.2017.0_87
DOI ID：10.14824/jakoka.2017.0_87, CiNii Articles ID：130007785958

ゲーレナイトの圧電材料としての可能性 (特集 GRENE振動発電用鉛フリー圧電体開発の概要)　　　　　　　　　　　　　　　
武田博明; 保科拓也; 鶴見敬章; 小玉展宏; 萩原学; 藤原忍
Volume：47, First page：11, Last page：15, Nov. 2016
Japanese
ISSN：0285-3833, CiNii Articles ID：40021386477, CiNii Books ID：AN00330126

Dielectric Breakdown Mechanism and Its Temperature Dependence of Ceramic Dielectrics　　　　　　　　　　　　　　　
鶴見敬章; 山崎幹雄; 保科拓也; 武田博明
Volume：51, Number：10, First page：666, Last page：670, Oct. 2016
Japanese
ISSN：0009-031X, CiNii Articles ID：40021187510, CiNii Books ID：AN00131516

Problems and Future of Lead-free Piezoelectric Materials　　　　　　　　　　　　　　　
鶴見敬章; 保科拓也; 武田博明
Volume：24, Number：12, First page：62, Last page：72, Dec. 2011
Japanese
ISSN：1344-7858, CiNii Articles ID：40019149100, CiNii Books ID：AA11323801

Crystal Growth of High Temperature Piezoelectric Crystals from Quasi-Congruent Melt　　　　　　　　　　　　　　　
TAKEDA Hiroaki; TSURUMI Takaaki
Ceramics Japan, Volume：46, Number：8, First page：657, Last page：661, 01 Aug. 2011
Japanese
ISSN：0009-031X, CiNii Articles ID：10030200563, CiNii Books ID：AN00131516

27pTM-3 High-temperature X-ray diffraction study of Bi_2WO_6　　　　　　　　　　　　　　　
Yoneda Yasuhiro; Kohara Shinji; Han Joong Sang; Takeda Hiroaki; Tsurumi Takaaki
Meeting abstracts of the Physical Society of Japan, Volume：66, Number：1, First page：982, Last page：982, 03 Mar. 2011
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110008715801, CiNii Books ID：AA11439205

Influence of Interface on Tunability in Barium Strontium Titanate
Naohiro Horiuchi; Takuya Hoshina; Hiroaki Takeda; Takaaki Tsurumi
Ceramic Transactions Series, First page：37, Last page：42, 28 Jun. 2010
Wiley
DOI：https://doi.org/10.1002/9780470909850.ch4
DOI ID：10.1002/9780470909850.ch4, eISSN：2637-4390

Search for Piezoelectric Single Crystals for Sensing Applications at Elevated Temperatures　　　　　　　　　　　　　　　
TAKEDA Hiroaki; TSURUMI Takaaki
Ceramics Japan, Volume：45, Number：6, First page：474, Last page：478, 01 Jun. 2010
Japanese
ISSN：0009-031X, CiNii Articles ID：10026877799, CiNii Books ID：AN00131516

25aYJ-6 Dielectric and Piezoelectric Properties of Fine-grained Barium Titanate Ceramics　　　　　　　　　　　　　　　
Hoshina Takuya; Kigoshi Yoichi; Hatta Saki; Takeda Hiroaki; Tsurumi Takaaki
Meeting abstracts of the Physical Society of Japan, Volume：64, Number：2, First page：853, Last page：853, 18 Aug. 2009
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110007499127, CiNii Books ID：AA11439205

Synthesis and characterization of (Bi1/2A1/2)- modified BaTiO3 (A=Na, K) semiconducting ceramics　　　　　　　　　　　　　　　
H. Takeda; T. Hoshina; T. Tsurumi; T. Shiosaki; P. H. Xiang
5th IMAPS/ACerS International Conference and Exhibition on Ceramic Interconnect and Ceramic Microsystems Technologies 2009, CICMT 2009, First page：183, Last page：187, 2009
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SCOPUS ID：84879866709

Size effect and domain contribution in barium titanate　　　　　　　　　　　　　　　
Takaaki Tsurumi; Takuya Hoshina; Hiroaki Takeda
5th IMAPS/ACerS International Conference and Exhibition on Ceramic Interconnect and Ceramic Microsystems Technologies 2009, CICMT 2009, First page：112, Last page：115, 2009
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84879867968&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84879867968&origin=inward
SCOPUS ID：84879867968

圧電・超音波材料希土類Caボレート単結晶の作製と圧電特性--LaCa4O(BO3)3系単結晶の作製と材料定数決定と弾性表面波特性　　　　　　　　　　　　　　　
塩嵜忠; 清水寛之; 武田博明
Volume：18, Number：4, First page：6, Last page：10,126, Jul. 2006
Japanese
ISSN：0916-2410, CiNii Articles ID：40007411555, CiNii Books ID：AN10068970

P1-2 Evaluation of Piezoelectric Constants of GdCOB Crystal and Calculation of Their SAW Characteristics　　　　　　　　　　　　　　　
Nishida Takashi; Shimizu Hiroyuki; Takeda Hiroaki; Uchiyama Kiyoshi; Shiosaki Tadashi
Proceedings of Symposium on Ultrasonic Electronics, Volume：26, First page：41, Last page：42, 16 Nov. 2005
Steering committee of symposium on ultrasonic electronics, Japanese
ISSN：1348-8236, CiNii Articles ID：110007458540, CiNii Books ID：AA1240726X

P1-3 Piezoelectric, elastic and dielectric constants and SAW properties of RCa_4O(BO_3)_3(R=La,Gd,Y) single crystals　　　　　　　　　　　　　　　
Kondo Ayako; Shimizu Hiroyuki; Nishida Takashi; Takeda Hiroaki; Uchiyama Kiyoshi; Shiosaki Tadashi
Proceedings of Symposium on Ultrasonic Electronics, Volume：26, First page：43, Last page：44, 16 Nov. 2005
Steering committee of symposium on ultrasonic electronics, Japanese
ISSN：1348-8236, CiNii Articles ID：110007458541, CiNii Books ID：AA1240726X

P2-19 Evaluation of material constants and SAW properties in LaCa_4O(BO_3)_3 single crystal(Short presentation for poster)　　　　　　　　　　　　　　　
Shimizu Hiroyuki; Takeda Hiroaki; Nishida Takashi; Shikida Takashi; Okamura Soichiro; Shiosaki Tadashi
Proceedings of Symposium on Ultrasonic Electronics, Volume：25, First page：195, Last page：196, 27 Oct. 2004
Steering committee of symposium on ultrasonic electronics, Japanese
ISSN：1348-8236, CiNii Articles ID：110007458381, CiNii Books ID：AA1240726X

Development of Ca_3Ga_2Ge_4O_<14>-Type Crystals for Piezoelectric Applications　　　　　　　　　　　　　　　
TAKEDA Hiroaki; SHIMAMURA Kiyoshi; OKAMURA Soichiro; SHIOSAKI Tadashi
Journal of the Society of Inorganic Materials,Japan, Volume：11, Number：308, First page：43, Last page：49, 01 Jan. 2004
Japanese
ISSN：1345-3769, CiNii Articles ID：10012478144, CiNii Books ID：AA11416367

Development of Rare-earth Elements Based Piezoelectric Materials　　　　　　　　　　　　　　　
SHIOSAKI Tadashi; TAKEDA Hiroaki; NISHIDA Takashi; OKAMURA Soichiro
Rare earths., Volume：43, First page：73, Last page：81, 14 Nov. 2003
Japanese
ISSN：0910-2205, CiNii Articles ID：10012510478, CiNii Books ID：AN10379697

Piezoelectric properties and structural characterization of (Na,Bi)Bi2Ta2O9 ceramics with bismuth layer-structure　　　　　　　　　　　　　　　
R. Aoyagi; M. Matsushita; K. Komagata; H. Takeda; S. Okamura; T. Shiosaki
IEEE International Symposium on Applications of Ferroelectrics, First page：311, Last page：314, 2002
English
SCOPUS ID：0038608215

Epitaxial growth of tungsten bronze (Sr,Ba)Nb2O6 thin films by chemical solution deposition　　　　　　　　　　　　　　　
Rintaro Aoyagi; Hiroaki Takeda; Soichiro Okamura; Takashi Nishida; Tadashi Shiosaki
IEEE International Symposium on Applications of Ferroelectrics, Volume：2, First page：905, Last page：908, 2000
English
SCOPUS ID：0034470441

Growth and characterization of new substituted langasite-type piezoelectric crystals　　　　　　　　　　　　　　　
KATO T.; TAKEDA H.; SIMAMURA K.; FUKUDA T.
Journal of the Japanese Association of Crystal Growth, Volume：25, Number：3, First page：A7, Jul. 1998
We have developed new substituted langasite crystals in order to increase piezoelectric constants. By solid state reaction and micro-pulling down technique, La_<2.75>Sr_<0.25>Ta_<0.625>Ga_<5.375>O_<14> and Sr_3TaGa_3Si_2O_<14> were obtained as single phase with langasite-type structure. These crystals with bulk size were also grown by the Czochralski technique.
The Japanese Association for Crystal Growth (JACG), Japanese
ISSN：0385-6275, CiNii Articles ID：110002715037, CiNii Books ID：AN00188386

Crystal Growth and Characterization of (La, Sr)(Al, Ta)O_3 Substrate for blue light emitting devices　　　　　　　　　　　　　　　
TAKEDA H.; TABATA H.; SIMAMURA K.; FUKUDA T.
Journal of the Japanese Association of Crystal Growth, Volume：25, Number：3, First page：A11, Jul. 1998
Bulk (La,Sr)(Al.Ta)O_3 single crystals were successfully grown by the Czochralski technique for a substrate material of GaN thin film. The lattice parameter and chemical composition of crystals were constant along the growth direction. Coloring of the grown crystals was discussed.
The Japanese Association for Crystal Growth (JACG), Japanese
ISSN：0385-6275, CiNii Articles ID：110002715041, CiNii Books ID：AN00188386

Crystal Growth and Physical Properties of La_3(Ga_<5-X> 2Al_x)SiO_<14>　　　　　　　　　　　　　　　
KUMATORIYA M.; TAKEDA H.; SHIMAMURA K.; TAKAGI H.; FUKUDA T.
Journal of the Japanese Association of Crystal Growth, Volume：24, Number：2, First page：159, Last page：159, 01 Jul. 1997
Al substituted Langasrte crvstals,La_3(Ga_<5-X> Al_X)Si0_<14>were synthesized by solid phase reaction, μ-pulling down and Czochralski techniques. From the result of solid phase reaction,χ=2.0 was found to be limit of substitution. In χ=0.5 crystal which was grown by Czochralski method, electromechanical coupling coefficients, k_<26>and k_t compared favorably with that of La_3Ga_5Si0<14>
The Japanese Association for Crystal Growth (JACG), Japanese
ISSN：0385-6275, CiNii Articles ID：110002714873, CiNii Books ID：AN00188386

■ Books and other publications

セラミック工学ハンドブック　　　　　　　　　　　　　　　
2002

■ Research projects

Developent of the real-time remote alpha-ray/gamma-ray/neutron monitor using noble scintillators　　　　　　　　　　　　　　　
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 01 Apr. 2024 - 31 Mar. 2028
Saitama University
Grant amount(Total)：18590000, Direct funding：14300000, Indirect funding：4290000
Grant number：24K01397

ケイ酸塩系新圧電結晶の結晶構造に基づく材料設計と高温振動子の開発　　　　　　　　　　　　　　　
01 Apr. 2022 - 31 Mar. 2026
Grant amount(Total)：17290000, Direct funding：13300000, Indirect funding：3990000
Grant number：22H02162

エマージェント物性を生みだす超秩序構造の創出　　　　　　　　　　　　　　　
19 Nov. 2020 - 31 Mar. 2025
Grant amount(Total)：175240000, Direct funding：134800000, Indirect funding：40440000
Grant number：20H05879

層状構造等をもつセラミックスを用いた空気中二酸化炭素の室温高速吸収無機固体の創成　　　　　　　　　　　　　　　
01 Apr. 2021 - 31 Mar. 2024
Grant amount(Total)：4160000, Direct funding：3200000, Indirect funding：960000
Grant number：21K05222

Development of high-performance, safe and low-cost solid energy-storage capacitors　　　　　　　　　　　　　　　
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Pioneering), 01 Apr. 2020 - 31 Mar. 2023
Tokyo Institute of Technology
Grant amount(Total)：26000000, Direct funding：20000000, Indirect funding：6000000
Grant number：20K20439

Construction of a terahertz spectroscopic ellipsometer system for ion dynamics analysis　　　　　　　　　　　　　　　
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 01 Apr. 2018 - 31 Mar. 2022
Hoshina Takuya, Tokyo Institute of Technology
Grant amount(Total)：17420000, Direct funding：13400000, Indirect funding：4020000
In this study, a terahertz spectroscopic ellipsometer system was constructed to measure the complex permittivity of inorganic solid materials in the millimeter to terahertz wave band. By analyzing the measured data, we aimed to understand ion dynamics, which is the origin of dielectric properties or ion conductivity. In particular, the order-disorder mode of barium titanate-based ferroelectrics, size effect of the same material system, dielectric polarization mechanism of lead-based relaxor ferroelectrics, and concerted action of ion diffusion and phonons in lithium ion conductors were clarified.
Grant number：18H01703

水晶を凌駕する新規圧電材料・デバイスの開発　　　　　　　　　　　　　　　
Apr. 2019 - Mar. 2022
Principal investigator
Competitive research funding

Proposal and verification of possibility for solid ion capacitors as an energy storage devise　　　　　　　　　　　　　　　
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), 01 Apr. 2016 - 31 Mar. 2021
Tsurumi Takaaki, Tokyo Institute of Technology
Grant amount(Total)：44590000, Direct funding：34300000, Indirect funding：10290000
The possibility of a solid-state ion capacitor that uses the long-range motion of ions in a solid to generate polarization has been verified as an energy storage device. The discharge amount of the solid ion capacitor using lithium lanthanum oxide as a solid electrolyte increased with due to the specific surface area of the electrode and the electric field applied to the electrolyte. A typical charge / discharge characteristics were also observed in the capacitors using lithium oxide glass as the electrolyte. A thin-layer capacitor was prepared using lithium oxide glass and nickel foil. The new concept of Faraday current barrier has made it possible to significantly improve charge / discharge efficiency and high voltage charge / discharge operation of the capacitor.
Grant number：16H02394

Development of new resonator material having a wide temperature range operation and high surface activity　　　　　　　　　　　　　　　
JSPS, KAKEN: Grant-in-Aid for Scientific Research (B), Apr. 2016 - Mar. 2019
TAKEDA Hiroaki, Principal investigator
Grant amount(Total)：16510000, Direct funding：12700000, Indirect funding：3810000
Competitive research funding

The development of the high-resistance new single crystal material was directed to a high temperature piezoelectric sensor　　　　　　　　　　　　　　　
JSPS, KAKEN: Fund for the Promotion of Joint International Research (Fostering Joint International Research), Fund for the Promotion of Joint International Research (Fostering Joint International Research), Apr. 2016 - Mar. 2019
TAKEDA Hiroaki, Tokyo Institute of Technology, Principal investigator
Grant amount(Total)：9490000, Direct funding：7300000, Indirect funding：2190000
In this study, we successfully grew mellilite-type single crystals which have attracted much attention as promising materials for combustion pressure sensor (CPS). Prior to growth experiment, in order to improve the performance of the crystal, we found a relationship between crystal structure, piezoelectricity and mechanical strength in the melilite-type crystals by the first-principles calculation. Based on the result, Sr-substituted gehlenite (SG) single crystal were grown by a Czochralski method. The electromechanical coefficients of the SG crystal were slightly small than those for the pure one, but were sufficient values for application. The mechanical strength of gehlenite increased by a factor of about 1.6 after both Sr substitution and optimization of the crystal substrate orientation. The SG crystal is the most attractive candidate for the CPS use.
Competitive research funding, Grant number：15KK0201

Development of piezoelectric crystals with high resistivity for high temperature applications　　　　　　　　　　　　　　　
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), 01 Apr. 2013 - 31 Mar. 2016
Takeda Hiroaki; TSURUMI Takaaki; HOSHINA Takuya, Tokyo Institute of Technology
Grant amount(Total)：18070000, Direct funding：13900000, Indirect funding：4170000
In this study, we report growth and electrical properties of Ca2Al2SiO7 (CAS) and its modified single crystals with melilite-type structure. These crystals showed high chemical stability, stable piezoelectric property, and high resistivity even at high temperature. Moreover, these crystals were easily grown by a conventional bulk growth technology. This study also demonstrated superior combustion sensor performance using these crystals even at 700 degree C. These results suggest that CAS and its modified crystals are the most promising candidate materials for piezoelectric sensor application at high temperatures.
Grant number：25288104

Development and Evaluation of Inorganic Electro-optic Crystals Based on a New Theory　　　　　　　　　　　　　　　
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 01 Apr. 2013 - 31 Mar. 2016
Tsurumi Takaaki; TAKEDA Hiroaki; HOSHINA Takuya, Tokyo Institute of Technology
Grant amount(Total)：18200000, Direct funding：14000000, Indirect funding：4200000
This study aimed for developing new lead-free electro-optic (EO) materials with superior performance to lanthanum-added lead zirconate titanate (PLZT). A measuring system of EO-effect was developed for opaque polycrystalline samples prepared by conventional solid state reaction process. Materials studied were pseudo-cubic provskite relaxors. We found that some barium titanate-based relaxors with the composition of barium titanate added with barium zirconate, calcium titanate and barium tin oxide exhibited higher EO-effect than that of PLZT. The EO-coefficients showed a maximum at room temperature and decreased with increasing temperature. The temperature dependence of the EO-coefficients was similar to that of permittivity of these materials.
Grant number：25289224

ドナー・アクセプター共ドープした非鉛PTCRデバイスの作製と粒界の電場応答解析　　　　　　　　　　　　　　　
2011 - 2013
Grant amount(Total)：2000000, Direct funding：2000000
Grant number：11F01364

Control and analysis of giant polarization generated by electron migration　　　　　　　　　　　　　　　
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 2010 - 2012
TUSUMI Takaaki; TAKEDA Hiroaki; HOSHINA Takuya, Tokyo Institute of Technology
Grant amount(Total)：18460000, Direct funding：14200000, Indirect funding：4260000
It is necessary to enhance polarization to obtain new materials with giant dielectric constants. Polarization is given by the product of charge and its displacement. We tried to enhance the polarization using migration of electrons in the artificial structures. Two kind of artificial structures, artificial superlattices with two conductive atomic layers and imhomogenous structure formed by spinodal decomposition, were formed, and found that the electron migration in these artificial structures enhance the polarization, giving rise to an marked increase of dielectric constants. The similar enhancement was observed when the ionic migration in a solid electrolyte was use to generate polarization.
Grant number：22360269

The development of environment-friendly lead-free piezoelectric actuator material　　　　　　　　　　　　　　　
JSPS, KAKEN: Grant-in-Aid for Scientific Research on Priority Areas, Apr. 2007 - Mar. 2009
TAKEDA Hiroaki, Principal investigator
Grant amount(Total)：7600000, Direct funding：7600000
Competitive research funding, Grant number：19016018

Phonon analysis and crystal chemical simulation of dielectrics based on sub-millimeter wave ellipsometry　　　　　　　　　　　　　　　
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), 2007 - 2009
TSURUMI Takaaki; TAKEDA Hiroaki; HOSHINA Takuya, Tokyo Institute of Technology
Grant amount(Total)：47450000, Direct funding：36500000, Indirect funding：10950000
Sub-millimeter wave spectroscopic ellipsometry has been developed to study the size effect of barium titanate and the phase transition behaviors of barium titanate-based relaxors. Ellipsometer is equipment which measures the change of polarizing state of reflected light to determine the complex dielectric permittivity of materials. Accuracy of the ellipsometer developed in this study was verified and the complex permittivity of a barium titanate single crystal was directly determined using it. S for the size effect, the permittivity of barium titanate ceramics increased with decreasing grain size when the grain size was over 1.1μm, while that decreased when the grain size was below 1μm. Most of the domains in BaTiO_3 grains had simple lamellar structures, and 90° domain width decreased with decreasing grain size. Based on wide band dielectric spectroscopy, the domain contribution to the permittivity was investigated. In BaTiO_3 ceramics with grain sizes over 1μm, the dipole and ionic polarizabilities were enhanced by the high domain density. In contrast, for the BaTiO_3 ceramics with grain sizes below 1μm, these polarizabilities were weakened. As for the phase transition of barium titanate-based relaxors, wideband dielectric spectra from kHz to THz were measured for ceramics of BaTiO_3 (BT), Ba_<0.6>Sr_<0.4>TiO_3 (BST-0.6) and BaZr_<0.25>Ti_<0.75>O_3 (BZT-0.25). The behavior in the dipole polarization near the dielectric maximum temperature (T_m) in BST-0.6 and BZT-0.25 could be explained by the behavior in polar nanoregions (PNRs), while the ferroelectric domains contribute to dipole polarization in BT. Relaxation in BT could be interpreted as successive change in polarization behavior from normal ferroelectrics to relaxor ferroelectric via DPT ferroelectrics.
Grant number：19206068

Deployment of the synthesis of high temperature corresponding piezoelectric crystal by the solid solubility limit doping and to the combustion pressure sensor element　　　　　　　　　　　　　　　
JSPS, KAKEN: Grant-in-Aid for Young Scientists (A), Apr. 2005 - Mar. 2008
TAKEDA Hiroaki, Principal investigator
Grant amount(Total)：24700000, Direct funding：19000000, Indirect funding：5700000
Competitive research funding, Grant number：17686058

Synthesis and evaluation of high-temperature high-Tc aimed the corresponding piezoelectric actuator and high binding ferroelectric single crystal　　　　　　　　　　　　　　　
JSPS, KAKEN: Grant-in-Aid for Scientific Research on Priority Areas, Apr. 2005 - Mar. 2007
TAKEDA Hiroaki, Principal investigator
Grant amount(Total)：4000000, Direct funding：4000000
Competitive research funding, Grant number：17040020

Deployment of high-performance piezoelectric material of new bismuth layered oxide ferroelectric　　　　　　　　　　　　　　　
JSPS, KAKEN: Grant-in-Aid for Young Scientists (B), Apr. 2002 - Mar. 2004
TAKEDA Hiroaki, Principal investigator
Grant amount(Total)：3400000, Direct funding：3400000
Competitive research funding, Grant number：14750238

Fabrication of Ferroelectric Nanocapacitors by Electron-beam Projection Patterning　　　　　　　　　　　　　　　
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), 2003 - 2004
OKAMURA Soichiro; TAKEDA Hiroaki; NISHIDA Takashi, Nara Institute of Science and Technology
Grant amount(Total)：3700000, Direct funding：3700000
A projection lithography technique of electron beam was applied to the fabrication of ferroelectric nanocapacitors to increase throughput. First of all, we tried to fabricate stencil masks. The stencil mask with square holes of 300x300 nm^2 was successfully prepared by using Ti foils with a thickness of 2 μm and etching them by FIB. Well-collimated electron beam was necessary to prevent the broadening pattern size. The distance of 10 μm between the mask and the sample was optimum for preventing undesirable exposure by secondary electrons from the mask. Finally, fine 400x400 nm^2-sized PZT nanocapacitors with self-aligned top Pt electrodes were successfully fabricated by the electron-beam-projection-lithography.
Parasitic capacitances attended in the measurement of hysteresis properties of ferroelectric microcapacitors were estimated. A scanning probe microscope with a conductive cantilever was used for contacting to various sized PZT capacitors. A parasitic capacitance on condition the cantilever was lifted up by 40 μm from the contact point was estimated to be 0.88 pF. From the capacitor area dependence of the hysteresis slopes, the increase in parasitic capacitance by bringing the cantilever near to substrates for contact was estimated to be 0.061 pF.
In the second year, we tried to fabricated ferroelectric photonic crystals. Ferroelectric photonic crystals consisted of a PLZT matrix and 800 nm-pitch air-holes with a diameter of 560 nm were successfully fabricated by the electron-beam-induced patterning process. Hexagonal holes inscribed to the circles with a diameter of 400 nm in a precursor matrix changed to circular holes with a diameter of 560 nm after heat-treatment due to shrinkage of the matrix. The optical properties of CSD-derived PLZT films were also evaluated. The PLZT films showed the refractive index of 2.3 and the Kerr constant of 0.4x10^<-16> m^2/V^2. Therefore, it is expected that an applied voltage of 9.7 V to 1 μm-thick PLZT photonic crystals induces 1%-decrease in refractive index and 40^o-swinging of light with a wavelength of 1.55 μm.
Grant number：15560277

Development and Characterization of Langasite-type crystals for surface acoustic wave device　　　　　　　　　　　　　　　
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), 2001 - 2002
SHINOSAKI Tadashi; TAKEDA Hiroaki; NISHIDA Takashi; OKAMURA Soichiro, NARA INSTITUTE OF SCIENCE AND TECHNOLOGY
Grant amount(Total)：3000000, Direct funding：3000000
In this study, we paid attention to Langasite (La_3Ga_5Sio_<14>: LGS) -type crystals. The LGS crystal is a leading material suitable for piezoelectric applications, because the crystal has intermediate properties between those properties of quartz and lithium tantalate (LiTaO_3) in electricity. However, a large amount of expensive gallium oxide as the raw material is necessary for mass-production. The aims of this study are to develop new LGS-type crystals consisting of lower gallium oxides.
In the first year, we have developed Al substituted LGS crystals (La_3Ga_<5-x>Al_xSiO_<14> (0 of Al in LGS was 1.03 to 1.07 and that the Al solubility limit was x<1.0. A single-crystal x-ray structure analysis reveals that Al atoms are distributed in all cation sites except for the decahedral one occupied by La, by rather favoring the smallest tetrahedral one. The piezoelectric modulus l d_<11> l increased; 1.3% and d_<14> decreased; 7.7% with the increasing Al content, x, up to 1.0. The Al-content obtaining the maximum electromechanical coupling factors (k_<12>, k_<25>, and k_<26>) was x=0.6.
In the second year, new piezoelectric Ba_3TaGa_3Si_2O_<14> (BTGS) crystal was synthesized by the Czochralski technique using raw materials with stoichiometric compositions. An analysis of growing process showed that the BTGS crystal congruently melts. The crystal structure of BTGS has been refined using single-crystal X-ray diffraction data. The distribution pf each cation was found to be ordered in each site. The maximum electromechanical factors k^2 in Y-cut BTGS wafer was about 0.43% at X-axis propagation. This value was larger than those of LGS.
For both LGAS and BTGS crystals enables the use of a lower amount of expensive gallium oxide as the raw material. Therefore, we can say that these two crystals are the preferable piezoelectric materials with the Langasite-type structure for both bulk- and surface-acoustic wave devices.
Grant number：13650346

Material Science Division	Professor
Department of Applied Chemistry

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TAKEDA HiroakiMaterial Science DivisionProfessorDepartment of Applied Chemistry

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TAKEDA　Hiroaki
Material Science Division Professor
Department of Applied Chemistry