業績情報

• 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, 巻：132, 号：7, 開始ページ：369, 終了ページ：374, 2024年07月, ［査読有り］
  This study focuses on the growth of transparent single crystals of Li2CaSiO4 (LCS) doped with Ce as neutron scintillator candidates. LCS is a light material with a high melting point and chemical stability; thus, LCS is applicable for use in high-flux neutron environments. However, the growth of transparent single crystals from the melt has been difficult owing to the phase transitions. In this study, the LiF/LiCl eutectic was used as a flux with a lower melting point and less decomposition than LiCl, and Ce was selected as the luminescent center. The phase diagram of the LiF/LiCl-LCS system was determined, and the conditions for crystal growth were optimized, consequently, transparent non-doped LCS and Ce:LCS crystals were successfully obtained. The alpha-ray-excited scintillation spectrum and scintillation decay time of Ce:LCS were measured in a feasibility study for neutron detection. The results showed that Ce:LCS has potential as a neutron scintillator, with a significantly fast decay time of 28.46 ns.
  研究論文（学術雑誌）
  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
• Spark plasma sintering and ionic conductivity of Li1.3Al0.3Ti1.7(PO4)3 fine particles synthesized by glass crystallization　　　　　　　　　　　　　　　
  Tatsuya Tezuka; Yuma Inagaki; Shohei Kodama; Hiroaki Takeda; Ikuo Yanase
  Powder Technology, 巻：429, 開始ページ：118870, 終了ページ：118870, 2023年11月, ［査読有り］
  Elsevier BV, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.powtec.2023.118870
  DOI ID：10.1016/j.powtec.2023.118870, ISSN：0032-5910
• 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, 巻：62, 号：SM, 開始ページ：SM1027, 終了ページ：SM1027, 2023年09月, ［査読有り］
  Abstract
  
  We report the effect of Sr substitution on the crystal growth and piezoelectric properties of calcium magnesium silicate Ca₂MgSi₂O₇ (CMS) single crystals. Strontium-substituted CMS single crystals with a chemical composition of Ca_1−x Sr _x MgSi₂O₇ (CSMS100x; x = 0.0 to 0.6) were grown using the conventional Czochralski method. CSMS100x crystals without impurity phases are obtained up to x = 0.5. Both crystallographic axis c and a increased with the Sr content x, and the crystallographic axis ratio a/c decreased. The piezoelectric d ₃₆ constants obtained using CMS, CSMS30, and CSMS40 crystals decreased with an increase in the Sr content x. Based on these observations, a relationship between piezoelectric properties and crystal structure was found using data from 14 types of melilite-type crystals. It was found that d ₃₆ increases with an increase in a/c.
  IOP Publishing, 研究論文（学術雑誌）
  DOI：https://doi.org/10.35848/1347-4065/acf2a5
  DOI ID：10.35848/1347-4065/acf2a5, ISSN：0021-4922, eISSN：1347-4065
• 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, 巻：131, 号：7, 開始ページ：258, 終了ページ：262, 2023年07月, ［査読有り］
  Ceramic Society of Japan, 研究論文（学術雑誌）
  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 Li1.4Al0.4Ti1.6(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, 巻：590, 開始ページ：121675, 終了ページ：121675, 2022年08月, ［査読有り］
  Elsevier BV, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.jnoncrysol.2022.121675
  DOI ID：10.1016/j.jnoncrysol.2022.121675, ISSN：0022-3093
• Growth and characterization of strontium-substituted La3Ta0.5Ga5.5O14 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, 巻：130, 号：1, 開始ページ：16, 終了ページ：20, 2022年01月, ［査読有り］
  The effects of strontium substitution on the electrical properties of La3Ta0.5Ga5.5O14 (LTG) are reported. Strontium substituted LTG (Sr-LTG) with a nominal chemical composition La2.9Sr0.1Ta0.55Ga5.45O14 crystals were grown using the conventional Czochralski method under high and low oxygen partial pressures. The electrical properties and thermal behaviors of the Sr-LTG crystals were also compared with those of pure crystals. Sr substitution was found to affect the electroacoustic constants and thermal expansion coefficient clearly. These characteristics are discussed from crystallographic perspectives. The Sr-LTG crystals grown at low oxygen partial pressures exhibited higher electrical resistivity ? for pressure sensors used at high temperatures.
  研究論文（学術雑誌）
  DOI：https://doi.org/10.2109/jcersj2.21116
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85122830537&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85122830537&origin=inward
  DOI ID：10.2109/jcersj2.21116, ISSN：1882-0743, eISSN：1348-6535, SCOPUS ID：85122830537
• 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, 巻：134, 2021年12月, ［査読有り］
  In this study, Na-ion conductivity of beta-NaFeO2 was improved by a low-temperature synthesis. A precursor Fecomplex containing ethylenediamine tetraacetate (EDTA) was prepared and then calcined at temperatures of 500-800 degrees C under flowing air (on heating) and Ar gas (on cooling). Single-phase beta-NaFeO2 powder was obtained at temperatures of 600-750 degrees C. The specific surface area of the beta-NaFeO2 powder increased as the calcination temperature decreased. The beta-NaFeO2 compact fabricated from the powder calcined at 600 degrees C had the largest density. Alternating current impedance analysis revealed that the resistivity of the grain boundaries in the compact decreased with increasing density, which improved the Na-ion conductivity of beta-NaFeO2. Thus, the Naion conductivity of beta-NaFeO2 was successfully improved by increasing its specific surface area.
  ELSEVIER, 英語, 研究論文（学術雑誌）
  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
• 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, 巻：125, 開始ページ：108394, 終了ページ：108394, 2021年03月, ［査読有り］
  Elsevier BV, 研究論文（学術雑誌）
  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 La3Ta0.5Ga5.5O14 Crystals for Pressure Sensors　　　　　　　　　　　　　　　
  Haruki Usui; Makoto Tokuda; Kazumasa Sugiyama; Takuya Hoshina; Takaaki Tsurumi; Kheirreddine Lebbou; Ikuo Yanase; Hiroaki Takeda
  CRYSTALS, 巻：10, 号：10, 2020年10月, ［査読有り］
  We present a possible method to reduce the anisotropy of the thermal stress generated on langasite-type La3Ta0.5Ga5.5O14 (LTG) piezoelectric crystals arising from the mismatch of the thermal expansion coefficients and Young's moduli of the crystals and metals at high temperatures. To formulate this method, the thermal stresses of order-type langasite crystals, in which each cation site is occupied by one element only, were calculated and compared to each other. Our results suggest that the largest cation site affects the thermal stress. We attempted to replace La3+ in LTG by a larger ion and considered Sr2+. Single crystals of strontium-substituted LTG (Sr-LTG) were grown using the Czochralski method. The thermal stress along the crystallographic c-axis decreased but that perpendicular to the c-axis increased by strontium substitution into the LTG crystal. The anisotropic thermal stress was reduced effectively. The Sr-LTG single crystal is a superior candidate material for pressure sensors usable at high temperatures.
  MDPI, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.3390/cryst10100936
  DOI ID：10.3390/cryst10100936, ISSN：2073-4352, Web of Science ID：WOS:000584488200001
• Substitution effect of V, Ca, and Ba on the thermochromic properties and thermal expansion of SrZr4(PO4)6　　　　　　　　　　　　　　　
  I. Yanase; K. Oomori; H. Kobayashi
  Ceramics International, 巻：45, 号：4, 開始ページ：5001, 終了ページ：5007, 2019年03月, ［査読有り］
  A novel thermochromic pigment was developed by substituting vanadium for phosphorous in strontium zirconium phosphate, SrZr4(PO4)6. X-ray diffractometry confirmed that single-phase rhombohedral SrZr4(P1−xVxO4)6, SZPV, pigments with x values from 0 to 0.15 were successfully synthesized. The SZPV powder had a reddish yellow color. Diffuse reflectance UV–vis spectroscopy indicated that the color phase, ΔE* of SZPV increased with increasing x values in the range of 0.05–0.15. SZPV exhibited a reversible thermochromic property in the range 30–170 °C. Furthermore, CaZr4(P1−xVxO4)6 with x = 0.05, CZPV, had a near-zero thermal expansion property and showed a larger thermal change of ΔE* in the range 30–170 °C, compared with those of SZPV with x = 0.05 and BaZr4(P1−xVxO4)6 with x = 0.05, BZPV. Rietveld analysis clarified that suppression of thermal expansion of the V–O distance of VO4 tetrahedra was effective for enhancing the thermochromic property of SZPV.
  Elsevier Ltd, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.ceramint.2018.11.200
  DOI ID：10.1016/j.ceramint.2018.11.200, ISSN：0272-8842, SCOPUS ID：85057885487
• Photoluminescence changes of Tb-substituted layered double hydroxides caused by capturing carbonate ions in water　　　　　　　　　　　　　　　
  Ikuo Yanase; Yuta Horiuchi; Hidehiko Kobayashi
  Materials Research Bulletin, 巻：110, 開始ページ：207, 終了ページ：213, 2019年02月, ［査読有り］
  Tb-substituted layered double hydroxides (Tb-LDHs) with NO3 − in the interlayer were synthesized by a hydrothermal method and then used to capture and sense CO3 2− in aqueous solution. X-ray diffractometry confirmed that single-phase Tb-LDHs with Tb contents of 1–5 mol% were successfully synthesized. The NO3 − ions of 5 mol% Tb-substituted LDH (Tb5LDH) were exchanged by CO3 2− ions in a Na2CO3 aqueous solution at pH = 11. The ion exchange for Tb5LDH was promoted with increasing the concentration of the Na2CO3 solution. Photoluminescence spectroscopy revealed that Tb5LDH with CO3 2− in the interlayer displayed an excitation wavelength of 229 nm and exhibited a green emission signal originating from the 4f8 → 4f75d1 transition, 5D4 → 7FJ (J = 3, 4, 5, 6), in the range of 400–700 nm. The intensity of the emission signal of the ion-exchanged Tb5LDH excited at 229 nm increased with increasing the content of CO3 2− in Tb5LDH. These results indicate that Tb5LDH was capable of capturing and sensing CO3 2− dissolved in water by irradiation with 229-nm light.
  Elsevier Ltd, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.materresbull.2018.10.021
  DOI ID：10.1016/j.materresbull.2018.10.021, ISSN：0025-5408, SCOPUS ID：85055673371
• Synthesis of W-substituted CeO2 powder and its CO2 adsorption under a CO2 atmosphere　　　　　　　　　　　　　　　
  Ikuo Yanase; Kensuke Suzuki; Taisei Ueda; Hidehiko Kobayashi
  Materials Letters, 巻：228, 開始ページ：470, 終了ページ：474, 2018年10月, ［査読有り］
  We synthesized W-substituted CeO2 (W-CeO2) with a fluorite structure by heating precipitates, prepared from Ce(NH4)2(NO3)6 and (NH4)6H2W12O40 aqueous solutions, at 700 °C in air. X-ray diffraction and X-ray fluorescence measurements confirmed successful W substitution into CeO2 with a fluorite structure. X-ray photoelectron spectroscopy revealed that the amount of Ce3+ in W-CeO2 was increased by W substitution. The lattice constant of the W-CeO2, as determined by Rietveld analysis, increased with increasing W content because of the greater Ce3+ content in CeO2. Fourier-transform infrared spectroscopy under a CO2-gas flow indicated that the proportion of hydrogen carbonate species on the surface of W-CeO2 with a W/Ce ratio of 1/6 was considerably larger than that of pure CeO2. The CO2 adsorption isotherms measured at 25 °C showed that W-CeO2 had a larger CO2 adsorption capacity than that of pure CeO2. Thus, the formation of hydrogen carbonate species improved the CO2 adsorption ability of the W-CeO2.
  Elsevier B.V., 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.matlet.2018.06.092
  DOI ID：10.1016/j.matlet.2018.06.092, ISSN：1873-4979, SCOPUS ID：85049021284
• Reversible CO2 capture by ZnO slurry leading to formation of fine ZnO particles　　　　　　　　　　　　　　　
  Ikuo Yanase; Satoshi Konno; Hidehiko Kobayashi
  Advanced Powder Technology, 巻：29, 号：5, 開始ページ：1239, 終了ページ：1245, 2018年05月, ［査読有り］
  ZnO powders were synthesized by heating precursors, prepared by the addition of ethylene diamine tetraacetate to an aqueous solution of zinc acetate, at 500 °C in air. A ZnO slurry was prepared by adding distilled water to the synthesized ZnO powder. X-ray diffraction studies confirmed that the ZnO slurry adsorbed CO2 at 25 °C under a CO2 gas flow to produce Zn5(CO3)2(OH)6. The CO2 adsorption ratio of the ZnO slurry was influenced by the amount of added water. When the weight ratio of water/ZnO was 1, the ZnO slurry had the largest CO2 adsorption ratio. Scanning electron microscopy and thermal gravimetry showed that the plate-like Zn5(CO3)2(OH)6 particles thermally decomposed at 300 °C in air leading to a single-phase ZnO powder consisting of nanoparticles with approximately 20 nm in diameter. The specific surface area of the reformed ZnO powder increased to approximately 82 m2/g through the thermal decomposition of Zn5(CO3)2(OH)6. The ZnO slurry was capable of adsorbing CO2 under a CO2 flow at 25 °C and desorbing CO2 under an air flow at 300 °C. The CO2 adsorption ratio of the ZnO slurry reached 80%–90% at 25 °C even after the fifth CO2 adsorption and desorption cycle.
  Elsevier B.V., 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.apt.2018.02.016
  DOI ID：10.1016/j.apt.2018.02.016, ISSN：1568-5527, SCOPUS ID：85042484987
• Hydrothermal synthesis and thermal change in IR reflectance of Al/W co-doped VO2 powder　　　　　　　　　　　　　　　
  Ikuo Yanase; Yasuaki Mori; Hidehiko Kobayashi
  Materials Research Bulletin, 巻：100, 開始ページ：243, 終了ページ：248, 2018年04月, ［査読有り］
  Al/W co-doped VO2 with a monoclinic structure, space group P21/c, was synthesized (hereafter, Al/W-doped VO2(M1)) and its thermochromic property was investigated. First, to prepare the precursor for Al/W-doped VO2(M1), V2O5, (NH4)10W12O41·5H2O, and AlCl3·H2O were dispersed in a citric acid solution and then hydrothermally treated in an autoclave. Then, the Al/W-doped VO2(M1) powders were synthesized by heating the obtained precursor at various temperatures under an Ar gas flow. The Al/W-doped VO2(M1) has a monoclinic structure with space group P21/c, similar to undoped VO2(M1) and W-doped VO2(M1). The Al/W-doped VO2(M1) indicated that the monoclinic to tetragonal transition temperature was lowered to approximately room temperature by the Al and W doping. The Al/W-doped VO2(M1) had the lower optical band gap and showed a larger IR reflectance in the 800–2000 nm range, compared with W-doped VO2(M1) and pure VO2(M1).
  Elsevier Ltd, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.materresbull.2017.12.017
  DOI ID：10.1016/j.materresbull.2017.12.017, ISSN：0025-5408, SCOPUS ID：85039783448
• Effect of B substitution on thermal changes of UV–Vis and Raman spectra and color of Al2W3O12 powder　　　　　　　　　　　　　　　
  Ikuo Yanase; Ryosuke Ootomo; Hidehiko Kobayashi
  Journal of Thermal Analysis and Calorimetry, 巻：132, 号：1, 2018年04月, ［査読有り］
  We investigated the influence of B substitution for Al2W3O12 on thermal changes of UV–Vis and Raman spectra, and colors. First, B-substituted Al2W3O12 powder was synthesized by a solid-state reaction method. Single-phase Al2−xBxW3O12 powders with x = 0, 0.10 and 0.20 were successively prepared. B substitution promoted thermal changes of the UV–Vis spectra, resulting in a more pronounced color change of Al2W3O12 in the range of 30–150 °C. Raman spectra of the Al2−xBxW3O12 powders with x = 0 and 0.20 indicated that the lattice vibrations of Al2−xBxW3O12 with x = 0.20 were larger than those of Al2W3O12. The thermal change of the color phase (ΔE) in the range 30–150 °C of Al2W3O12 was increased by B substitution. The color of the B-substituted Al2W3O12 powders changed reversibly from pale white at 30 °C to light yellowish green at 150 °C.
  Springer Netherlands, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1007/s10973-017-6933-9
  DOI ID：10.1007/s10973-017-6933-9, ISSN：1588-2926, SCOPUS ID：85039555882
• Fabrication and negative thermal expansion properties of P-substituted ZrV2O7 sintered bodies　　　　　　　　　　　　　　　
  Ikuo Yanase; Hiroya Chida; Hidehiko Kobayashi
  JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 巻：38, 号：1, 開始ページ：221, 終了ページ：226, 2018年01月, ［査読有り］
  Calcined powders of ZrV1.2P0.8O7 (ZVP) and ZrV2O7 (ZV) were synthesized by heating gels prepared from NH4H2PO4, NH4VO3, and ZrOCl2 solutions at 500 and 400 degrees C, respectively. Dense ZV-added ZVP sintered bodies were subsequently fabricated through heating at 850 degrees C for 20 h, with the addition of ZrV2O7 as a sintering additive. The resulting material had a relative density of ca. 92%, while the relative density of pure sintered ZVP was ca. 72%. NH4H2PO4 (NHP) was also added to ZVP along with ZV to obtain a molar ratio of P in NHP for V in ZV = 1. Subsequently, a single phase (NHP, ZV)-added ZVP sintered body was obtained by heating at 850 degrees C. Thermomechanical analysis showed that the dense ZV-added ZVP sintered body exhibited a positive thermal expansion from 25 to 150 degrees C and a negative thermal expansion from 150 to 500 degrees C.
  ELSEVIER SCI LTD, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.jeurceramsoc.2017.08.010
  DOI ID：10.1016/j.jeurceramsoc.2017.08.010, ISSN：0955-2219, eISSN：1873-619X, Web of Science ID：WOS:000414117500025
• Fabrication of Zr2WP2O12/ZrV0.6P1.4O7 composite with a nearly zero-thermal-expansion property　　　　　　　　　　　　　　　
  Ikuo Yanase; Hiroshi Sakai; Hidehiko Kobayashi
  MATERIALS LETTERS, 巻：207, 開始ページ：221, 終了ページ：224, 2017年11月, ［査読有り］
  Sintered bodies of Zr2WP2O12 (ZWP) and ZrV0.6P1.4O7 (ZVP) were fabricated, and their linear thermal expansion coefficients (TEC) were found to be -2.92 x 10(-6) and 3.27 x 10(-6) degrees C-1, respectively, in the range 25-500 degrees C. In an attempt to fabricate composites with a zero-thermal-expansion property, sintered ZWP/ZVP composites with ZVP/ZWP volume ratios of 0.5/0.5, 0.53/0.47, 0.55/0.45, and 0.6/0.4 were fabricated. Scanning electron microscopy revealed that sintering of ZVP/ZWP composites progressed well compared with that of ZWP. A porous ZVP/ZWP composite with a relative density of ca. 83% was fabricated at a ZVP/ZWP volume ratio of 0.53/0.47. X-ray diffractometry and energy dispersive X-ray spectrometry clarified that the ZVP/ZWP composite mainly consisted of ZWP and ZVP grains. Thermomechanical analysis confirmed that the ZVP/ZWP composite exhibited very low thermal expansion with a slight hysteresis with a TEC of -0.29 x 10(-7) degrees C-1 in the range 25-500 degrees C. (C) 2017 The Authors. Published by Elsevier B.V.
  ELSEVIER SCIENCE BV, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.matlet.2017.07.051
  DOI ID：10.1016/j.matlet.2017.07.051, ISSN：0167-577X, eISSN：1873-4979, Web of Science ID：WOS:000407691000057
• The effect of addition of a large amount of CeO2 on the CO2 adsorption properties of CaO powder　　　　　　　　　　　　　　　
  Ikuo Yanase; Tomomi Maeda; Hidehiko Kobayashi
  CHEMICAL ENGINEERING JOURNAL, 巻：327, 開始ページ：548, 終了ページ：554, 2017年11月, ［査読有り］
  Composite powders of CeO2 and CaO (Ce/Ca composite) with CeO2/CaO weight ratios of 0, 0.5, 1, and 2 were synthesized by heating precipitates consisting of CaC2O4 and CeO2 at 900 degrees C under Ar gas flow. X-ray diffractometry (XRD) and reflected electron imaging clarified that the Ce/Ca composites consisted of CeO2 and CaO phases and the CeO2 particles were well dispersed in the CaO powders. XRD and X-ray photoelectron spectroscopy revealed that the carbonation of CaO and the production of Ce3+ in CeO2 of the Ce/Ca composite were promoted with increasing temperature under CO2 gas flow. The activation energy of the carbonation decreased from approximately 107 to 40 kJ mol(-1) with increasing CeO2/CaO weight ratio from 0 to 2. (C) 2017 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE SA, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.cej.2017.06.140
  DOI ID：10.1016/j.cej.2017.06.140, ISSN：1385-8947, eISSN：1873-3212, Web of Science ID：WOS:000408663800059
• CO2 absorption and desorption property of porous SiO2 with Co-MEA complex　　　　　　　　　　　　　　　
  Ikuo Yanase; Kaai Someya; Hidehiko Kobayashi
  JOURNAL OF CO2 UTILIZATION, 巻：21, 開始ページ：139, 終了ページ：144, 2017年10月, ［査読有り］
  Various MEA solutions were prepared by adding M(CH3COO)(2) (M = Ni, Co, Cu, Zn) to mono-ethanolamine (hereafter M-MEA solution) to improve the CO2 desorption property of MEA. From the FTIR spectra and UV-vis-NIR, it was found that the Co-MEA complex, [Co(MEA)(3)](3+), was formed in the Co-MEA solution. The Co-MEA solution including [Co(MEA)(3)](3+) showed an excellent CO2 desorption property at 60 degrees C, compared to Ni-MEA, Zn-MEA, Cu-MEA, and non-added MEA. Then, the Co-MEA/SiO2 composite was fabricated by impregnating Co-MEA to a mesoporous silica. The CO2 desorption property at 60 degrees C of the Co-MEA/SiO2 composite was also improved, similar with the Co-MEA solution. The CO2 absorption capacity at RT of the Co-MEA/SiO2 composite was lowered compared to than that of the non-added MEA/SiO2 composite. However, the CO2 absorption capacity of the Co-MEA/SiO2 composite was almost maintained even at the 10th repetition of CO2 absorption and desorption. Thus, it was found the Co-MEA/SiO2 composite was stable for CO2 absorption and desorption and was an appropriate material for improving the CO2 desorption behavior of MEA.
  ELSEVIER SCI LTD, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.jcou.2017.06.009
  DOI ID：10.1016/j.jcou.2017.06.009, ISSN：2212-9820, eISSN：2212-9839, Web of Science ID：WOS:000411443200016
• Carbonation and phase transformations of LiMO2 (M = Fe, Co, Ni) under CO2 atmosphere　　　　　　　　　　　　　　　
  Ikuo Yanase; Jun Miura; Hidehiko Kobayashi
  MATERIALS CHEMISTRY AND PHYSICS, 巻：199, 開始ページ：18, 終了ページ：22, 2017年09月, ［査読有り］
  Under a CO2 gas flow, O3-LiFeO2, having a layered structure, transformed to alpha-LiFeO2, and then (beta'-LiFeO2 with increasing temperature. All LiFeO2 phases decomposed to Fe2O3 and Li2CO3 under a CO2 gas flow. Conversely, carbonation and structural phase transformations of LiCoO2 and LiNiO2, also having layered structures, were not observed at low temperatures under a CO2 gas flow. In particular, LiCoO2 was chemically stable and its layered structure was maintained even at 600 degrees C. The carbonation and structural phase transformations of alpha-LiFeO2, having a cubic structure, were suppressed compared with those of O3-LiFeO2. To investigate the effect of cation doping into LiFeO2 on carbonation and structural phase transformations, Na-substituted alpha-LiFeO2, NaxLi1-xFeO2 with x = 0 to 0.15 was synthesized. X-ray diffraction measurements revealed that substitution of Na for Li in LiFeO2 suppressed the particle growth induced by carbonation of LiFeO2 under a CO2 gas flow. (C) 2017 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE SA, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.matchemphys.2017.06.024
  DOI ID：10.1016/j.matchemphys.2017.06.024, ISSN：0254-0584, eISSN：1879-3312, Web of Science ID：WOS:000409150800003
• Solid-state MAS NMR investigations for pentavalent cation-replaced pollucite compounds with a negative thermal expansion coefficient　　　　　　　　　　　　　　　
  Ikuo Yanase; Yumi Saito; Hidehiko Kobayashi
  JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 巻：129, 号：2, 開始ページ：1271, 終了ページ：1276, 2017年08月, ［査読有り］
  Pollucite compounds with an aluminosilicate structure, V-replaced pollucite, Cs0.7V0.1Al0.8Si2.1O6 (CVAS), P-replaced pollucite, Cs0.7P0.1Al0.8Si2.1O6 (CPAS), and Nb-replaced pollucite, Cs0.7Nb0.1Al0.8Si2.1O6 (CNbAS), were synthesized by a multistep heat treatment of 550-1200 A degrees C. CVAS exhibited the superior thermal expansion with thermal expansion coefficients of 0.9 x 10(-6) A degrees C-1 (30-500 A degrees C), -0.9 x 10(-6) A degrees C-1 (30-150 A degrees C), and -0.4 x 10(-6) A degrees C-1 (30-100 A degrees C). Solid-state Si-29 MAS NMR spectroscopy clarified that the number of Si-O-Si bonds of tetrahedra in the framework of CVAS was larger than those of CPAS and CNbAS. The chemical shift for peaks of the Si-29 MAS NMR spectrum of CVAS was larger than those of CPAS and CNbAS, suggesting that the bond angle of tetrahedra was enlarged by the V replacement. Solid-state Al-27 MAS NMR spectroscopy implied that CVAS had a small amount of sixfold coordinated Al species, which resulted in an increase in the number of Si-O-Si bonds of tetrahedra of CVAS.
  SPRINGER, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1007/s10973-017-6248-x
  DOI ID：10.1007/s10973-017-6248-x, ISSN：1388-6150, eISSN：1588-2926, Web of Science ID：WOS:000404994900064
• Effect of orientation of CaO plate-like particle on CO2 adsorption property　　　　　　　　　　　　　　　
  Ikuo Yanase; Tatero Sasaki; Hidehiko Kobayashi
  POWDER TECHNOLOGY, 巻：315, 開始ページ：15, 終了ページ：21, 2017年06月, ［査読有り］
  The plate-like CaO particle with a highly (111)-plane orientation was synthesized, and its CO2 adsorption property was investigated. Firstly, the Ca(OH)(2) powders were prepared from a saturated Ca(OH)(2) aqueous solution, and then the prepared Ca(OH)(2) powder was thermally decomposed to synthesize the CaO powder. The orientation degree of the (0001) plane of Ca(OH)(2) was increased by increasing the time for evaporating the solvent in the Ca(OH)(2) aqueous solution. The orientation degree of the (111) plane of CaO increased by increasing that of the (0001) plane of Ca(OH)(2). Increasing the orientation degree of the (111) plane of CaO was effective for suppressing the aggregation of CaO particles in the CaO powder. Consequently, it was found that the CO2 adsorption rate was increased by increasing the specific surface area of the CaO powder. Furthermore, the (111) plane-oriented CaO powder maintained the CO2 adsorption ratio even after the cycle of CO2 adsorption and desorption at 700 degrees C. (C) 2017 Published by Elsevier B.V.
  ELSEVIER SCIENCE BV, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.powtec.2017.02.059
  DOI ID：10.1016/j.powtec.2017.02.059, ISSN：0032-5910, eISSN：1873-328X, Web of Science ID：WOS:000401593600002
• Low-Temperature Synthesis of Calcium Hexaboride Powder via Transient Boron Carbide Formation　　　　　　　　　　　　　　　
  Masaki Kakiage; Shuhei Shiomi; Ikuo Yanase; Hidehiko Kobayashi
  JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 巻：98, 号：9, 開始ページ：2724, 終了ページ：2727, 2015年09月, ［査読有り］
  Calcium hexaboride (CaB6) powder was synthesized by carbothermal reduction using a low-temperature synthesis method for boron carbide (B4C) powder. A B4C precursor consisting of boron oxide (B2O3) and carbon components was prepared from a condensed boric acid (H3BO3)-poly(vinyl alcohol) (PVA) product by thermal decomposition in air, which was then mixed with calcium carbonate (CaCO3) powder. CaB6 was formed via the transient formation of calcium borate (Ca3B2O6) and B4C, which were in close contact owing to the finely dispersed B2O3/carbon structure of the B4C precursor. CaB6 powder with fine particles was synthesized by heat treatment at 1400 degrees C for 10h in an Ar flow.
  WILEY-BLACKWELL, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1111/jace.13771
  DOI ID：10.1111/jace.13771, ISSN：0002-7820, eISSN：1551-2916, Web of Science ID：WOS:000362229400013
• Structural phase transition and thermochromic behavior of synthesized W-substituted CuMoO4　　　　　　　　　　　　　　　
  Ikuo Yanase; Tetsunari Mizuno; Hidehiko Kobayashi
  CERAMICS INTERNATIONAL, 巻：39, 号：2, 開始ページ：2059, 終了ページ：2064, 2013年03月, ［査読有り］
  Tungsten (W)-substituted copper molybdenum oxide (CuMoO4) compounds with different substitution ratios of W were synthesized, and the effects of the substitution ratio on the structural phase transition and thermochromic behavior were investigated. Precursor powders prepared by a liquid-phase method were heat-treated at 550-600 degrees C for 24 h to obtain CuMo1-xWxO4 (x=0.04-0.12) powders. Differential scanning calorimetry (DSC) revealed that the temperature at which CuMo1-xWxO4 (x=0.04-0.12) underwent a structural phase transition of the gamma phase to the alpha phase increased with increasing x. CuMo1-xWxO4 (x=0.06) underwent a structural phase transition in the range of RT to 100 degrees C and showed a significant change in the diffuse reflectance spectrum in the visible light range, suggesting that the color of the CuMo1-xWxO4 (x=0.06) powder changed visually in the range of RT to 100 degrees C. The thermal change in color of the CuMo1-xWxO4 (x=0.06) powder was recognized even after 10 times repetition of heating and cooling. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
  ELSEVIER SCI LTD, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.ceramint.2012.08.059
  DOI ID：10.1016/j.ceramint.2012.08.059, ISSN：0272-8842, Web of Science ID：WOS:000313379400148
• Microstructure in precursor formed by controlling composition of condensed boric acid-poly(vinyl alcohol) product for low-temperature synthesis of boron carbide powder　　　　　　　　　　　　　　　
  Masaki Kakiage; Naoki Tahara; Rie Watanabe; Ikuo Yanase; Hidehiko Kobayashi
  JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 巻：121, 号：1409, 開始ページ：40, 終了ページ：44, 2013年01月, ［査読有り］
  The dispersion state of boron oxide (B2O3) and carbon components in a precursor prepared from a condensed boric acid (H3BO3)-polyol product by thermal decomposition in air was found to be closely related to the formation of boron carbide (B4C) powder at a low synthesis temperature. The microstructure in the precursor was fabricated by controlling the composition of a condensed H3BO3-poly(vinyl alcohol) (PVA) product. The size of B2O3 particles dispersed in the carbon matrix of the microstructure decreased with increasing PVA content of the condensed product. Crystalline B4C powder with a little free carbon was synthesized from a precursor with a more finely and homogeneously dispersed structure consisting of B2O3 particles and the carbon matrix by heat treatment at 1200 degrees C for 5 h in an Ar flow. Furthermore, the formation and subsequent grain growth of B4C particles were promoted even at a low synthesis temperature. (C)2013 The Ceramic Society of Japan. All rights reserved.
  CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.2109/jcersj2.121.40
  DOI ID：10.2109/jcersj2.121.40, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000320900900009
• Preparation of Crystalline Turbostratic Boron Nitride Nanoparticles by Combination of Precursor Compound Formation and Impurity Segregation from Boric Acid and Urea　　　　　　　　　　　　　　　
  Masaki Kakiage; Daisuke Yoshikoshi; Ikuo Yanase; Hidehiko Kobayashi
  ADVANCED MICRO-DEVICE ENGINEERING III, 巻：534, 開始ページ：55, 終了ページ：+, 2013年, ［査読有り］
  Crystalline turbostratic boron nitride (t-BN) was prepared by a combination of precursor compound formation and impurity segregation from boric acid (H3BO3) and urea. A mixed material was prepared by separately dissolving H3BO3 and urea in distilled water then blended them, which was followed by drying. A precursor compound including oxygen was formed from the mixed material upon low-temperature heat treatment at 250 degrees C. The oxygen-containing impurity was segregated as a boron oxide component by the hydrolysis of the precursor compound during the grinding process in air, leading to the effective layered structure formation and layer stacking of t-BN. Crystalline t-BN nanoparticles with well-stacked layered structures were prepared by leaching the segregated impurity in a hot aqueous solution of the product formed by heat treatment at 1300 degrees C in an Ar flow.
  TRANS TECH PUBLICATIONS LTD, 英語, 研究論文（国際会議プロシーディングス）
  DOI：https://doi.org/10.4028/www.scientific.net/KEM.534.55
  DOI ID：10.4028/www.scientific.net/KEM.534.55, ISSN：1013-9826, Web of Science ID：WOS:000316642000011
• Synthesis of boron carbide powder in relation to composition and structural homogeneity of precursor using condensed boric acid-polyol product　　　　　　　　　　　　　　　
  Masaki Kakiage; Yusuke Tominaga; Ikuo Yanase; Hidehiko Kobayashi
  POWDER TECHNOLOGY, 巻：221, 開始ページ：257, 終了ページ：263, 2012年05月, ［査読有り］
  Crystalline boron carbide (B4C) powder was synthesized by the carbothermal reduction of boron oxide (B2O3) using a condensed boric acid (H3BO3)-mannitol product. The condensed product was prepared by the dehydration condensation of H3BO3 and mannitol at several molar ratios. The composition of the precursor was controlled by thermal decomposition in air before the carbothermal reduction of the condensed product, which had a homogeneous structure but an excessive carbon component compared with that required for the carbothermal reduction. B4C powder with less free carbon could be synthesized by heat treatment at 1250 degrees C for 5 h in an Ar flow of the thermally decomposed product prepared from the condensed product by thermal decomposition at 400 degrees C for 3 h in air. Furthermore, the structural homogeneity of the precursor affected the B4C formation behavior at the low synthesis temperature. These results demonstrated that the compatibility of the composition, the dispersibility, and the homogeneity of the B2O3 and carbon components in the precursor, which was achieved by thermal decomposition of the condensed product in air, leads to the low-temperature synthesis of crystalline B4C powder using a condensed H3BO3-polyol product. (c) 2012 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE SA, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.powtec.2012.01.010
  DOI ID：10.1016/j.powtec.2012.01.010, ISSN：0032-5910, Web of Science ID：WOS:000303222300032
• Phase transition and UV-vis spectra of Al₂Mo₃O₁₂-related compounds　　　　　　　　　　　　　　　
  Kimiwada S.; Yanase I.; Kobayashi H.
  Transactions of the Materials Research Society of Japan, 巻：37, 号：1, 開始ページ：95, 終了ページ：98, 2012年, ［査読有り］
  (Co, Zr)-substituted Al₂Mo₃O₁₂-related compounds with various chemical compositions were synthesized by a solid-state reaction. All of the synthesized compounds with a single phase were identified as Al₂Mo₃O₁₂ or Al₂W₃O₁₂-related compounds by XRD. High-temperature XRD and DTA analysis clarified that the structural phase-transition temperature of the synthesized Co_0.05Zr_0.05Al_1.9Mo_3-yW_yO₁₂ (0≦y≦3) decreased with increasing the W content. High temperature XRD also revealed that the synthesized Co_0.05Zr_0.05Al_1.9Mo_0.9W_2.1O₁₂ had a discontinuous thermal expansion around 333 K. The UV-vis-NIR spectra of the synthesized compound at each temperature of 303 to 373 K were investigated. Although the diffusion-reflectance ratio almost unchanged until 333 K, it began to decrease at 343 K. The spectral change corresponded to the discontinuous thermal expansion of the synthesized Co_0.05Zr_0.05Al_1.9Mo_0.9W_2.1O₁₂. Furthermore, it was found that the synthesized (Co, Zr)-substituted compounds had the optical property with the ΔL* luminance decreasing in the range of R.T. to 373 K due to its structural phase transition.
  The Materials Research Society of Japan, 英語
  DOI：https://doi.org/10.14723/tmrsj.37.95
  DOI ID：10.14723/tmrsj.37.95, ISSN：1382-3469, CiNii Articles ID：130003399056
• Synthesis and thermal expansion of (V, P, Nb)-replaced pollucite　　　　　　　　　　　　　　　
  Ikuo Yanase; Yumi Saito; Hidehiko Kobayashi
  CERAMICS INTERNATIONAL, 巻：38, 号：1, 開始ページ：811, 終了ページ：815, 2012年01月, ［査読有り］
  Pollucite compounds in which tetrahedral cations are partially replaced with V, P or Nb were synthesized by a solid-state reaction. An amorphous phase was recognized by X-ray diffractometry for all the above pollucite compounds when mixed raw powders were preliminarily heated at 600 degrees C to decompose CsNO3 as a Cs source. Then V-replaced, Nb-replaced, and P-replaced pollucite compounds began to crystallize by heating at 550, 800, and 1000 degrees C, respectively. Finally, single phases of these compounds were synthesized at 700, 1000, and 1200 degrees C, respectively. The V-replaced pollucite compound Cs0.7V0.1Al0.8Si2.1O6 exhibited the lowest thermal expansion in the range of 25-500 degrees C at which its thermal expansion coefficient was 0.7 x 10(-6) K-1, while the P-replaced pollucite compound Cs0.7P0.1Al0.8Si2.1O6 and the Nb-replaced pollucite compound CS0.7Nb0.1Al0.8Si2.1O6 showed thermal expansion coefficients of 1.9 x 10(-6) K-1 and 1.4 x 10(-6) K-1 in the range of 25-500 degrees C, respectively. It was considered that such an excellent low thermal expansion coefficient of the synthesized V-replaced pollucite was due to the ionic radius of V5+ being between those of Al3+ and Si4+ in the aluminosilicate framework of pollucite compounds. (C) 2011 Elsevier Ltd and Techna Group Sri. All rights reserved.
  ELSEVIER SCI LTD, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.ceramint.2011.07.034
  DOI ID：10.1016/j.ceramint.2011.07.034, ISSN：0272-8842, Web of Science ID：WOS:000298766900108
• CO2 absorption of CeO2-coated alpha-LiFeO2　　　　　　　　　　　　　　　
  Ikuo Yanase; Hirofumi Otsuka; Hidehiko Kobayashi
  JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 巻：119, 号：1396, 開始ページ：933, 終了ページ：938, 2011年12月, ［査読有り］
  alpha-LiFeO2 columnar particles were synthesized by heating a mixture of gamma-Fe2O3 and LiNO3 at 500 degrees C in air. CeO2 nanoparticles were prepared from Ce(OH)(3) obtained by a precipitation method. The alpha-LiFeO2 columnar particles were mixed with the CeO2 nanoparticles in an aqueous solution and then the mixture of alpha-LiFeO2 and CeO2 was heated at 300 degrees C to prepare the alpha-LiFeO2 coated with CeO2 nanoparticles. Then the effect of CeO2 coating on CO2 absorption ability of alpha-LiFeO2 was investigated. As a result, coating of CeO2 on alpha-LiFeO2 particles was found to suppress the structural phase transition of alpha-LiFeO2 to beta'-LiFeO2, although the synthesized alpha-LiFeO2 underwent a structural phase transition of alpha-LiFeO2 to beta'-LiFeO2 accompanied by the reaction of alpha-LiFeO2 with CO2 in the temperature range of 350 to 425 degrees C. The suppression of the structural phase transition resulted in an increase in CO2 absorption rate of LiFeO2 in the temperature range up to 425 degrees C. Thermodynamic analysis revealed that the alpha-LiFeO2 phase has a lower activation energy for CO2 diffusion than the beta'-LiFeO2 phase, which results in the enhancement of the CO2 absorption rate of LiFeO2. (C)2011 The Ceramic Society of Japan. All rights reserved.
  CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.2109/jcersj2.119.933
  DOI ID：10.2109/jcersj2.119.933, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000298224500007
• Low-temperature synthesis of boron carbide powder from condensed boric acid-glycerin product　　　　　　　　　　　　　　　
  Masaki Kakiage; Naoki Tahara; Ikuo Yanase; Hidehiko Kobayashi
  MATERIALS LETTERS, 巻：65, 号：12, 開始ページ：1839, 終了ページ：1841, 2011年06月, ［査読有り］
  Crystalline boron carbide (B(4)C) powder was synthesized by the carbothermal reduction of a condensed product formed from boric acid (H(3)BO(3)) and glycerin (C(3)H(8)O(3)). The condensed product was prepared by dehydration after directly mixing equimolar amounts of H(3)BO(3) and glycerin, which was followed by pyrolysis in air to obtain a precursor powder from which the excess carbon had been eliminated. The prepared precursor powder had a bicontinuous boron oxide (B(2)O(3))/carbon network structure. Crystalline B(4)C powder without residual carbon was successfully synthesized from this precursor powder by heating at 1250 degrees C for 5 h in an Ar flow. (C) 2011 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE BV, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.matlet.2011.03.046
  DOI ID：10.1016/j.matlet.2011.03.046, ISSN：0167-577X, Web of Science ID：WOS:000291457200029
• Effect of boron oxide/carbon arrangement of precursor derived from condensed polymer-boric acid product on low-temperature synthesis of boron carbide powder　　　　　　　　　　　　　　　
  Masaki Kakiage; Naoki Tahara; Satomi Yanagidani; Ikuo Yanase; Hidehiko Kobayashi
  JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 巻：119, 号：1390, 開始ページ：422, 終了ページ：425, 2011年06月, ［査読有り］
  The effect of the boron oxide (B2O3)/carbon arrangement of the precursor on the low-temperature synthesis of boron carbide (B4C) powder was investigated in this study. The precursor was prepared by low-temperature heat treatment without thermal decomposition and subsequent pyrolysis in air of the condensed product formed from poly(vinyl alcohol) (PVA) and boric acid. The dispersion state of B2O3 particles in the carbon matrix of the precursor significantly affected the acceleration of the synthesis reaction. Crystalline B4C powder with little free carbon was obtained by heat treatment at 1100 degrees C, which was also the critical formation temperature, for 20 h in an Ar flow starting from a precursor with a B2O3/carbon structure homogeneously arranged at the nanometer scale. (C)2011 The Ceramic Society of Japan. All rights reserved.
  CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.2109/jcersj2.119.422
  DOI ID：10.2109/jcersj2.119.422, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000292225700009
• Effects of Nb and Y substitution on negative thermal expansion of ZrV2-xPxO7 (0 <= X <= 0.8)　　　　　　　　　　　　　　　
  Ikuo Yanase; Taku Kojima; Hidehiko Kobayashi
  SOLID STATE COMMUNICATIONS, 巻：151, 号：8, 開始ページ：595, 終了ページ：598, 2011年04月, ［査読有り］
  Zirconium vanadates with a novel chemical composition including niobium and yttrium were synthesized by the sol-gel method. An aqueous solution of NH4H2PO4 and NH4VO3 and an ethanol solution of ZrOCl2, NbCl5, and YCl3 were prepared. These two solutions were stirred and mixed to prepare precursors of zirconium vanadates at 333 K, following the evaporation of the solvent at 363 K. The precursor gels obtained were heated at 373-973 K in air. A zirconium vanadate phase began to crystallize above 673 K and a single phase of zirconium vanadate was synthesized at 973 K. Although ZrV2O7 generally had a positive thermal expansion in the temperature range above RT, the degree of positive thermal expansion decreased with the two types of substitution of P for V and a set of Nb and Y for Zr of ZrV2O7. X-ray diffraction peaks due to a superlattice structure, causing a positive thermal expansion from RT, were not observed in the synthesized (Nb, Y)-substituted zirconium vanadates. (C) 2011 Elsevier Ltd. All rights reserved.
  PERGAMON-ELSEVIER SCIENCE LTD, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.ssc.2011.02.007
  DOI ID：10.1016/j.ssc.2011.02.007, ISSN：0038-1098, eISSN：1879-2766, Web of Science ID：WOS:000289584800003
• Cs-leaching behavior of Cs-titanosilicate in NaCl solution　　　　　　　　　　　　　　　
  Ikuo Yanase; Taiki Takahashi; Motoyoshi Tomizawa; Hidehiko Kobayashi
  MATERIALS LETTERS, 巻：65, 号：2, 開始ページ：314, 終了ページ：316, 2011年01月, ［査読有り］
  Cs-titanosilicate, which is a pollucite-related phase, was synthesized and the Cs-leaching behavior of Cs-titanosilicate was evaluated in a NaCl aqueous solution and ion-exchanged water. CsNO(3). TiO(2) and SiO(2) powders were mixed in ethanol by ball-milling and then the mixed powder was heated at temperatures of 600 to 900 degrees C under atmospheric and reduced pressures of air. Under reduced pressure, the Cs-titanosilicate phase was crystallized at 700 degrees C, which was lower than that under atmospheric pressure because CsNO3 decomposition was promoted under reduced pressure. The Cs-leaching ratio of the Cs-titanosilicate in a NaCl aqueous solution is higher than that in ion-exchanged water. On the other hand, the Cs-leaching ratio of the Cs-titanosilicate synthesized under the reduced pressure was lower than that under atmospheric pressure. It was considered that the lower negative zeta potential of the Cs-titanosilicate synthesized under the reduced pressure diminished the amount of Na(+) ion adsorbed on the particles surface of the Cs-titanosilicate, which resulted in the suppression of Cs-leaching. (C) 2010 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE BV, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.1016/j.matlet.2010.10.010
  DOI ID：10.1016/j.matlet.2010.10.010, ISSN：0167-577X, Web of Science ID：WOS:000286158000050
• CO2 absorption and structural phase transition of .ALPHA.-LiFeO2
  Ikuo YANASE; Akihiro KAMEYAMA; Hidehiko KOBAYASHI
  Journal of the Ceramic Society of Japan, 巻：118, 号：1373, 開始ページ：48, 終了ページ：51, 2010年, ［査読有り］
  Ceramic Society of Japan, 研究論文（学術雑誌）
  DOI：https://doi.org/10.2109/jcersj2.118.48
  DOI ID：10.2109/jcersj2.118.48, ISSN：1882-0743, eISSN：1348-6535
• CO2 absorption of CaO coated on aluminosilicate foam
  Ikuo YANASE; Yu YAMAKAWA; Hidehiko KOBAYASHI
  Journal of the Ceramic Society of Japan, 巻：116, 号：1350, 開始ページ：176, 終了ページ：180, 2008年, ［査読有り］
  Ceramic Society of Japan, 研究論文（学術雑誌）
  DOI：https://doi.org/10.2109/jcersj2.116.176
  DOI ID：10.2109/jcersj2.116.176, ISSN：1882-0743, eISSN：1348-6535
• Effect of ball-milling on porous structure of Ca-substituted leucite porous body with low thermal expansion coefficient　　　　　　　　　　　　　　　
  Ikuo Yanase; Yoichi Ishikawa; Hidehiko Kobayashi
  JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 巻：114, 号：1336, 開始ページ：1115, 終了ページ：1120, 2006年12月, ［査読有り］
  The ball-milling for amorphous calcined powder in a PMMA solution, prepared by heating a mixture of nitrates, gamma-Al2O3, and amorphous SiO2 powders were effective for the fabrication of Ca-substituted leucite porous bodies with almost homogeneous pore-size distributions. Especially, when the amorphous powder calcined at 1073 K was ball-milled for 48 h, the pore size decreased to 0.159 mu m and porosity increased in the porous body fabricated using the amorphous calcined powder. The FT-IR spectroscopy revealed that the amorphous calcined powder is composed of fine particles having a network of (Si, Al) O-4 tetrahedra similar to the aluminosilicate framework of the leucite compounds. The fabricated porous body showed a low linear thermal expansion coefficient of 1.405 x 10(-6)/K in the temperature range of 298 to 1273 K.
  CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, 英語, 研究論文（学術雑誌）
  ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000242876900003
• Sintering of pollucite using amorphous powder and its low thermal expansion property　　　　　　　　　　　　　　　
  Yanase, I; S Tamai; H Kobayashi
  JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 巻：111, 号：8, 開始ページ：533, 終了ページ：536, 2003年08月, ［査読有り］
  Calcined powders were prepared for sintering of cubic Cs0.9Al0.9Si2.1O6 by calcining a mixture of Al2O3/SiO2 fine powder and CsNO3 powder at temperatures of 798 to 1123 K for 20 h in air. The amorphous phase produced in the case of a lower calcination temperature, while the crystallinity of the calcined powder increased with increasing calcination temperature. Densification of the Cs0.9Al0.9Si2.1O6 green body was significantly enhanced using the amorphous calcined powder. The relative density of the Cs0.9Al0.9Si2.1O6 sintered body reached 94.5% when the green body of the amorphous calcined powder, including a slight amount of CsNO3, was sintered at 1673 K for 20 h in air. The dense cubic Cs0.9Al0.9Si2.1O6 sintered body showed linear thermal expansion without hysteresis, resulting in a thermal expansion rate of ca. 0.13% at 1273 K.
  CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, 英語, 研究論文（学術雑誌）
  ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000184849500001
• Thermal expansion property of synthetic cubic leucite-type compounds　　　　　　　　　　　　　　　
  Yanase, I; H Kobayashi; T Mitamura
  JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 巻：108, 号：1, 開始ページ：26, 終了ページ：31, 2000年01月, ［査読有り］
  Various cubic Cs-leucite compounds with the space group Ia3d were synthesized by a solid-state reaction method, and thermal expansion properties for the synthetic powders were studied in the temperature range from 123 to 1273 K using high-temperature X-ray diffraction (HTXRD) and low-temperature X-ray diffraction (LTXBD). The thermal expansion rates of both the synthetic cubic CsBa0.2Al0.8Si2O6; and cubic Cs2MSi5O12 (M = Cd, Mg, Ni, Zn) were lower than that of the synthetic cubic CsMSi2O6 (M = Al, Fe), and the thermal expansion rate of the synthetic cubic Cs0.9Al0.9Si2.1O6 was lower than that of CsAlSi2O6. Consequently, decreasing the average ionic radius of cations in the RI site, or increasing the Si/M molar ratio of the (Si, M) O-4 tetrahedra was found to be effective for decreasing the thermal expansion rate, Furthermore, it was suggested that the increase of the space for Cs sites in the unit cell decreases the thermal expansion rate of the cubic Cs-leucite compounds with the space group Ia3d.
  CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, 英語, 研究論文（学術雑誌）
  DOI：https://doi.org/10.2109/jcersj.108.26
  DOI ID：10.2109/jcersj.108.26, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000085188700007
• Thermal property and phase transition of the synthesized new cubic leucite-type compounds　　　　　　　　　　　　　　　
  I. Yanase; H. Kobayashi; T. Mitamura
  Journal of Thermal Analysis and Calorimetry, 巻：57, 号：3, 開始ページ：695, 終了ページ：705, 1999年, ［査読有り］
  New cubic leucite-type compounds, CsMSi2O6 (M=B0.2Al0.8, Al0.2Fe0.8), Cs2MSi5O12 (M=Cd, Mg, Ni, Zn) have been synthesized by the two-stage heat treatment of the solid-state reaction. The thermal expansion properties of the synthesized leucite-type compounds have been studied with HTXRD and LTXRD in the temperature range of 123 to 1273 K. The thermal expansion rate of CsB0.2Al0.8Si2O6 was found to be considerably smaller than that of CsAlSi2O6, while the thermal expansion property of Cs2MSi5O12 (M=Mg, Zn, Cd) was found to have a linear relationship in the temperature range of 298 to 1273 K. By using Rietveld analysis it was found that the thermal expansion rate decreased with increasing the Si-O-M(Si) angle for cubic leucite-type compounds at 298 K, and that the phase transitions of CsAlSi2O6 and Cs0.9Al0.9O6 were due to the relationship between the bond angle of Si-O-M(Si) of the three-dimensional framework structure and the space ratio in the unit cell at 298 K.
  Kluwer Academic Publishers, 英語, 研究論文（学術雑誌）
  ISSN：1388-6150, SCOPUS ID：0033309439

• 中低温CO₂吸収分離回収のための無機材料開発 (特集 革新的先進材料の開発と応用)　　　　　　　　　　　　　　　
  柳瀬 郁夫
  ケミカルエンジニヤリング = Chemical engineering, 巻：59, 号：12, 開始ページ：928, 終了ページ：933, 2014年12月
  化学工業社, 日本語
  ISSN：0387-1037, CiNii Articles ID：40020275770, CiNii Books ID：AN00074423
• 低熱膨張立方晶リューサイト化合物の開発　　　　　　　　　　　　　　　
  柳瀬 郁夫; 小林 秀彦
  セラミックス, 巻：46, 号：11, 開始ページ：916, 終了ページ：921, 2011年11月01日
  日本セラミックス協会, 日本語
  ISSN：0009-031X, CiNii Articles ID：10030201041, CiNii Books ID：AN00131516
• Fabrication of zero-thermal-expansion ZrSiO4/Y2W3O12 sintered body　　　　　　　　　　　　　　　
  I. Yanase; M. Miyagi; H. Kobayashi
  巻：29, 号：15, 開始ページ：3129, 終了ページ：3134, 2009年12月
  We focused on the linear negative thermal expansion of Y2W3O12 in a wide-temperature range and on the chemical stability of ZrSiO4 in the fabrication of the composite material ZrSiO4/Y2W3O12 with a zero-thermal-expansion. The compact composed of Y2W3O12 and ZrSiO4 had a thermal shrinkage rate smaller than that of Y2W3O12 and higher than that of ZrSiO4. SEM-EDX observation clarified that the ZrSiO4/Y2W3O12 sintered body fabricated at 1400 degrees C for 10 h had a microstructure composed of ZrSiO4 and Y2W3O12 grains, and XRD indicated that only ZrSiO4 and Y2W3O12 phases existed in the sintered body. The relative density of the ZrSiO4/Y2W3O12 sintered body reached 92%, which was larger than that of the ZrSiO4 sintered body because Y2W3O12 grains could be sintered at lower temperatures. The average linear thermal expansion coefficients of the ZrSiO4/Y2W3O12 sintered body were -0.4 x 10(-6) and -0.08 x 10(-6)degrees C-1 in the temperature ranges from 25 to 500 degrees C and from 25 to 1000 degrees C, respectively, which showed an almost zero-thermal-expansion. (C) 2009 Elsevier Ltd. All rights reserved.
  英語
  DOI：https://doi.org/10.1016/j.jeurceramsoc.2009.06.001
  DOI ID：10.1016/j.jeurceramsoc.2009.06.001, ISSN：0955-2219, CiNii Articles ID：80020552259, Web of Science ID：WOS:000270162100004
• Synthesis of boron carbide powder from polyvinyl borate precursor　　　　　　　　　　　　　　　
  Ikuo Yanase; Riichi Ogawara; Hidehiko Kobayashi
  巻：63, 号：1, 開始ページ：91, 終了ページ：93, 2009年01月
  Polyvinyl borate (PVBO) was prepared by the condensation of poly(vinyl alcohol) (PVA) and boric acid, and used as a precursor for boron carbide. Boron carbide powder was synthesized by the pyrolysis of the PVBO precursor in air at 600 degrees C for 2 h, followed by heat treatment in At flow at 1300 degrees C for 5 h, which is a relatively low temperature compared with conventional carbothermal methods. Pyrolysis of the PVBO precursor resulted in submicron-size particles of B(2)O(3) dispersed in a carbon matrix. In addition, the pyrolysis temperature governed the carbon content in the pyrolyzed product of the PVBO precursor, which led to the synthesis of crystalline boron carbide powder with little free carbon. (C) 2008 Published by Elsevier B.V.
  英語
  DOI：https://doi.org/10.1016/j.matlet.2008.09.012
  DOI ID：10.1016/j.matlet.2008.09.012, ISSN：0167-577X, CiNii Articles ID：80019971229, Web of Science ID：WOS:000261368600029
• CO2 absorption of CaO coated on aluminosilicate foam　　　　　　　　　　　　　　　
  Ikuo Yanase; Yu Yamakawa; Hidehiko Kobayashi
  巻：116, 号：1350, 開始ページ：176, 終了ページ：180, 2008年02月
  CaO-coated aluminosilicate foam, Cs0.9Al0.9Si2.1O6, was fabricated by utilizing a polyurethane foam, and CO2 absorption behavior of the foam was investigated. Aluminosilicate foam was fabricated by two-step heat treatment at 873 K for 20 h and 1523 K for 5 h following the coating of aluminosilicate slurry on the polyurethane foam. CaO-coated foam was fabricated by the decomposition of Ca (OH)(2) pillar crystals prepared by coating CaO slurry on the aluminosilicate foam at 1073 K for 5 h, which resulted in the formation of porous CaO on the foam. The CaO-coated foam showed good CO2 absorption ability and a long lifetime for the cyclic process of CO2 absorption and desorption. The CaO-coated foam continued to maintain a CO2 absorption ratio of approximately 90% for 15 CO2 absorption and desorption cycles.
  英語
  DOI：https://doi.org/10.2109/jcersj2.116.176
  DOI ID：10.2109/jcersj2.116.176, ISSN：1882-0743, eISSN：1348-6535, CiNii Articles ID：110006571071, Web of Science ID：WOS:000253394600003
• 二酸化炭素吸収材料の開発　　　　　　　　　　　　　　　
  柳瀬 郁夫
  産学連携フェア2008 : 展示ポスター, 開始ページ：1, 終了ページ：1, 2008年
• ゼロ熱膨張コーディエライト複合材料の開発　　　　　　　　　　　　　　　
  柳瀬郁夫
  財団法人 谷川熱技術振興基金 事業報告書, 巻：26, 開始ページ：17, 2008年
• Fabrication of Pollucite Porous Body for CO2 Absorption　　　　　　　　　　　　　　　
  Ikuo Yanase; Yu Yamakawa; Hidehiko Kobayashi
  Transactions of the Materials Research Society of Japan, 巻：33, 開始ページ：1131, 終了ページ：1134, 2008年
• 二酸化炭素吸収材料の開発　　　　　　　　　　　　　　　
  柳瀬 郁夫
  開始ページ：1, 終了ページ：1, 2008年
• CO2 absorption of CaO coated on aluminosilicate foam　　　　　　　　　　　　　　　
  Ikuo Yanase; Yu Yamakawa; Hidehiko Kobayashi
  巻：116, 号：1350, 開始ページ：176, 終了ページ：180, 2008年
  CaO-coated aluminosilicate foam Cs0.9Al0.9Si 2.1O6, was fabricated by utilizing a polyurethane foam, and CO2 absorption behavior of the foam was investigated. Aluminosilicate foam was fabricated by two-step heat treatment at 873 K for 20 h and 1523 K for 5 h following the coating of aluminosilicate slurry on the polyurethane foam. CaO-coated foam was fabricated by the decomposition of Ca(OH)2 pillar crystals prepared by coating CaO slurry on the aluminosilicate foam at 1073 K for 5 h, which resulted in the formation of porous CaO on the foam. The CaO-coated foam showed good CO2 absorption ability and a long lifetime for the cyclic process of CO2 absorption and desorption. The CaO-coated foam continued to maintain a CO 2 absorption ratio of approximately 90% for 15 CO2 absorption and desorption cycles.
  英語
  DOI：https://doi.org/10.2109/jcersj2.116.176
  DOI ID：10.2109/jcersj2.116.176, ISSN：1348-6535, CiNii Articles ID：110006571071, SCOPUS ID：44649166284
• ゼロ熱膨張コーディエライト複合材料の開発　　　　　　　　　　　　　　　
  柳瀬郁夫
  巻：26, 開始ページ：17, 2008年
• Fabrication of Pollucite Porous Body for CO2 Absorption　　　　　　　　　　　　　　　
  Ikuo Yanase; Yu Yamakawa; Hidehiko Kobayashi
  巻：33, 開始ページ：1131, 終了ページ：1134, 2008年
• 新規な高効率二酸化炭素吸収セラミックス多孔体の開発　　　　　　　　　　　　　　　
  柳瀬 郁夫
  総合研究機構研究プロジェクト研究成果報告書, 巻：第5号(18年度), 開始ページ：541, 終了ページ：542, 2007年
• 格子内空間を利用した負の熱膨張を示す新規セラミックスの設計　　　　　　　　　　　　　　　
  柳瀬郁夫
  財団法人旭硝子財団，助成研究成果報告2007, 開始ページ：23, 2007年
• 新規な高効率二酸化炭素吸収セラミックス多孔体の開発　　　　　　　　　　　　　　　
  柳瀬 郁夫
  巻：第5号(18年度), 開始ページ：541, 終了ページ：542, 2007年
• 格子内空間を利用した負の熱膨張を示す新規セラミックスの設計
  柳瀬 郁夫
  旭硝子財団助成研究成果報告, 開始ページ：23, 終了ページ：8, 2007年
  旭硝子財団, 日本語
  ISSN：1882-0069, CiNii Articles ID：40019970922
• Phase transition and lattice thermal expansion of Cs-deficient pollucite, Cs1-xAl1-xSi2+xO6 (x≤0.25), compounds　　　　　　　　　　　　　　　
  Hidehiko Kobayashi; Saiko Sumino; Sachiko Tamai; Ikuo Yanase
  巻：89, 号：10, 開始ページ：3157, 終了ページ：3161, 2006年10月
  Cs-deficient pollucite compounds with the general composition Cs 1-xAl1-xSi2+xO6 and a cubic pollucite structure at room temperature (RT) were prepared by a multistep solid-state reaction. The single phase of the products was confirmed by powder X-ray diffraction (XRD) analysis at RT. Structural phase transition was influenced by the Cs content of compounds of the Cs1-xAl 1-xSi2+xO6 series. Cs0.8Al 0.8Si2.2O6 and Cs0.75Al 0.75 Si2.25O6 were cubic at 123 K from the XRD patterns and did not undergo structural phase transition. The lattice thermal expansion behavior of the Cs-deficient pollucite compounds was investigated by low-temperature and high-temperature XRD analyses in the temperature range of 123-1173 K and was found to show a gradual decrease with decreasing Cs content of Cs1-xAl1-xSi2+xO6 series. The variation in unit cell volume with temperature for each composition showed that Cs0.8Al0.8 Si2.2O6 and Cs 0.75Al0.75Si2.25O6 had significantly smaller degrees of lattice thermal expansion than CsAlSi 2O6 and Cs0.9Al0.9Si 2.1O6. CsAlSi2O6, Cs 0.9Al0.9Si2.1O6, Cs 0.8Al0.8 Si2.2O6, and Cs 0.75Al0.75Si2.25O6 showed linear coefficients of thermal expansion of 2.7 × 10-6, 2.2 × 10-6, 1.5 × 10-6, and 1.1 × 10-6 K-1, respectively, which are attributed to not only an increase in space ratio but also a decrease in Al/Si ratio in the framework in the unit cell. © 2006 The American Ceramic Society.
  英語
  DOI：https://doi.org/10.1111/j.1551-2916.2006.01188.x
  DOI ID：10.1111/j.1551-2916.2006.01188.x, ISSN：0002-7820, CiNii Articles ID：80018853779, SCOPUS ID：33749022246
• Phase transition and lattice thermal expansion of cs-deficient pollucite, Cs1-xAl1-xSi2+xO6 (x <= 0.25), compounds　　　　　　　　　　　　　　　
  Hidehiko Kobayashi; Saiko Sumino; Sachiko Tamai; Ikuo Yanase
  巻：89, 号：10, 開始ページ：3157, 終了ページ：3161, 2006年10月
  Cs-deficient pollucite compounds with the general composition Cs1-xAl1-xSi2+xO6 and a cubic pollucite structure at room temperature (RT) were prepared by a multistep solid-state reaction. The single phase of the products was confirmed by powder X-ray diffraction (XRD) analysis at RT. Structural phase transition was influenced by the Cs content of compounds of the Cs1-xAl1-xSi2+xO6 series. Cs0.8Al0.8Si2.2O6 and Cs0.75Al0.75Si2.25O6 were cubic at 123 K from the XRD patterns and did not undergo structural phase transition. The lattice thermal expansion behavior of the Cs-deficient pollucite compounds was investigated by low-temperature and high-temperature XRD analyses in the temperature range of 123-1173 K and was found to show a gradual decrease with decreasing Cs content of Cs1-xAl1-xSi2+xO6 series. The variation in unit cell volume with temperature for each composition showed that Cs0.8Al0.8Si2.2O6 and Cs0.75Al0.75Si2.25O6 had significantly smaller degrees of lattice thermal expansion than CsAlSi2O6 and Cs0.9Al0.9Si2.1O6. CsAlSi2O6, Cs0.9Al0.9Si2.1O6, Cs0.8Al0.8Si2.2O6, and Cs0.75Al0.75Si2.25O6 showed linear coefficients of thermal expansion of 2.7 x 10(-6), 2.2 x 10(-6), 1.5 x 10(-6), and 1.1 x 10(-6) K-1, respectively, which are attributed to not only an increase in space ratio but also a decrease in Al/Si ratio in the framework in the unit cell.
  英語
  DOI：https://doi.org/10.1111/j.1551-2916.2006.01188.x
  DOI ID：10.1111/j.1551-2916.2006.01188.x, ISSN：0002-7820, CiNii Articles ID：80018853779, Web of Science ID：WOS:000240661400024
• Visual RIETAN　　　　　　　　　　　　　　　
  柳瀬 郁夫
  MaLS FORUM, 巻：4, 開始ページ：19, 終了ページ：20, 2006年
• 低熱膨張Ca置換リューサイト多孔体の細孔構造に及ぼすボールミル効果　　　　　　　　　　　　　　　
  柳瀬 郁夫; 石川 洋一; 小林 秀彦
  日本セラミックス協会学術論文誌, 巻：114, 号：1336, 開始ページ：1115, 終了ページ：1120, 2006年
  The ball-milling for amorphous calcined powder in a PMMA solution, prepared by heating a mixture of nitrates, γ-Al2O3, and amorphous SiO2 powders were effective for the fabrication of Ca-substituted leucite porous bodies with almost homogeneous pore-size distributions. Especially, when the amorphous powder calcined at 1073 K was ball-milled for 48 h, the pore size decreased to 0.159 μm and porosity increased in the porous body fabricated using the amorphous calcined powder. The FT-IR spectroscopy revealed that the amorphous calcined powder is composed of fine particles having a network of (Si, Al)O4 tetrahedra similar to the aluminosilicate framework of the leucite compounds. The fabricated porous body showed a low linear thermal expansion coefficient of 1.405 × 10 -6/K in the temperature range of 298 to 1273 K.
  英語
  DOI：https://doi.org/10.2109/jcersj.114.1115
  DOI ID：10.2109/jcersj.114.1115, ISSN：1348-6535, CiNii Articles ID：110004997692, SCOPUS ID：33845336523
• 高強度なコーディエライト／ジルコン複合焼結体の作製　　　　　　　　　　　　　　　
  柳瀬郁夫; 片岡弓子; 川口弘幸; 小林秀彦
  2005年度埼玉大学地域共同研究センター紀要., 号：6, 開始ページ：75, 終了ページ：78, 2006年
• Influence of cesium nitrate and heating rate on densification and microstructure of Cs-deficient pollucite sintered body　　　　　　　　　　　　　　　
  Ikuo Yanase; Junichi Konakawa; Hidehiko Kobayashi
  巻：89, 号：1, 開始ページ：184, 終了ページ：188, 2006年01月
  Cs-deficient pollucite, Cs0.9Al0.9Si 2.1O6, a sintered body with a low thermal expansion coefficient of 1.26 × 10-6 K-1 in the temperature range of 298 to 1273 K, has been fabricated using calcined powders with an amorphous phase. The calcined powder was prepared by heating mixtures of CsNO3, γ-Al2O3, and amorphous SiO 2 powders at 798 K in air for 20 h, repeated 10 times. The repetition of the heat treatment at 798 K was performed to decompose CsNO3 thoroughly in the mixed raw powders and to obtain calcined powders with a high specific surface area. The relative density of the sintered bodies fabricated from the green compact of the amorphous calcined powder increased with increasing sintering temperature and heating rate. The sintered body with a relative density of ca. 96%, of a well-crystallized pollucite single phase and with the grain size in the range of 0.75-4.75 μm, was fabricated by heating the green compact of the amorphous powders at 1673 K in air for 20 h at a heating rate of 20 K/min. © 2005 The American Ceramic Society.
  英語
  DOI：https://doi.org/10.1111/j.1551-2916.2005.00703.x
  DOI ID：10.1111/j.1551-2916.2005.00703.x, ISSN：0002-7820, CiNii Articles ID：80017646474, SCOPUS ID：33645114588
• Effect of ball-milling on porous structure of Ca-substituted leucite porous body with low thermal expansion coefficient　　　　　　　　　　　　　　　
  Ikuo Yanase; Yoichi Ishikawa; Hidehiko Kobayashi
  巻：114, 号：1336, 開始ページ：1115, 終了ページ：1120, 2006年
  The ball-milling for amorphous calcined powder in a PMMA solution, prepared by heating a mixture of nitrates, γ-Al2O3, and amorphous SiO2 powders were effective for the fabrication of Ca-substituted leucite porous bodies with almost homogeneous pore-size distributions. Especially, when the amorphous powder calcined at 1073 K was ball-milled for 48 h, the pore size decreased to 0.159 μm and porosity increased in the porous body fabricated using the amorphous calcined powder. The FT-IR spectroscopy revealed that the amorphous calcined powder is composed of fine particles having a network of (Si, Al)O4 tetrahedra similar to the aluminosilicate framework of the leucite compounds. The fabricated porous body showed a low linear thermal expansion coefficient of 1.405 × 10 -6/K in the temperature range of 298 to 1273 K.
  英語
  DOI：https://doi.org/10.2109/jcersj.114.1115
  DOI ID：10.2109/jcersj.114.1115, ISSN：1348-6535, SCOPUS ID：33845336523
• Ca-substituted Pollucite Body Fabricated from Amorphous Calcined Powder　　　　　　　　　　　　　　　
  I.Yanase; Y.Ishikawa; H.Kobayashi
  Smart Porcessing Technology, 巻：1, 開始ページ：103, 終了ページ：106, 2006年
• Structural Phase Transition of Na-substituted Cs-lecuite Compounds in the Range: 123 to 1173 K　　　　　　　　　　　　　　　
  I.Yanase; K.Ichiyoshi; H.Kobayashi
  Solid State Communications, 巻：139, 号：1, 開始ページ：1, 終了ページ：4, 2006年
  DOI：https://doi.org/10.1016/j.ssc.2006.05.016
  DOI ID：10.1016/j.ssc.2006.05.016, ISSN：0038-1098, CiNii Articles ID：80019082810
• Effect of Ball-milling on Porous Structure of Ca-substituted Leucite with Low Thermal Expansion Property　　　　　　　　　　　　　　　
  I.Yanase; Y.Ishikawa; H.Kobayashi
  Journal of the Ceramic Society of Japan, 114 pp.1115-1120 (2006)., 巻：114, 号：1336, 開始ページ：1115, 終了ページ：1120, 2006年
  DOI：https://doi.org/10.2109/jcersj.114.1115
  DOI ID：10.2109/jcersj.114.1115, ISSN：0914-5400
• 高強度なコーディエライト／ジルコン複合焼結体の作製　　　　　　　　　　　　　　　
  柳瀬郁夫; 片岡弓子; 川口弘幸; 小林秀彦
  2005年度埼玉大学地域共同研究センター紀要, 巻：第6号, 開始ページ：75, 終了ページ：78, 2006年
• ナノ空間制御による超低熱膨張を示す新規セラミックスの創製　　　　　　　　　　　　　　　
  柳瀬郁夫
  財団法人池谷科学技術振興財団 平成17年度年報, 巻：平成17年度, 開始ページ：173, 終了ページ：174, 2006年
• 二酸化炭素吸収能を有する高耐熱性ゼオライト多孔質体の創製　　　　　　　　　　　　　　　
  柳瀬郁夫
  財団法人向科学技術振興財団 助成研究成果集, 巻：第7号, 開始ページ：43, 終了ページ：46, 2006年
• Visual RIETAN　　　　　　　　　　　　　　　
  柳瀬 郁夫
  巻：4, 開始ページ：19, 終了ページ：20, 2006年
• 低熱膨張Ca置換リューサイト多孔体の細孔構造に及ぼすボールミル効果　　　　　　　　　　　　　　　
  柳瀬 郁夫; 石川 洋一; 小林 秀彦
  巻：114, 号：1336, 開始ページ：1115, 終了ページ：1120, 2006年
  DOI：https://doi.org/10.2109/jcersj.114.1115
  DOI ID：10.2109/jcersj.114.1115, ISSN：0914-5400, CiNii Articles ID：110004997692
• 高強度なコーディエライト／ジルコン複合焼結体の作製　　　　　　　　　　　　　　　
  柳瀬郁夫; 片岡弓子; 川口弘幸; 小林秀彦
  号：6, 開始ページ：75, 終了ページ：78, 2006年
• Influence of cesium nitrate and heating rate on densification and microstructure of Cs-deficient pollucite sintered body　　　　　　　　　　　　　　　
  Yanase, I; J Konakawa; H Kobayashi
  巻：89, 号：1, 開始ページ：184, 終了ページ：188, 2006年01月
  Cs-deficient pollucite, Cs(0.9)AI(0.9)Si(2.1)O(6), a sintered body, with a low thermal expansion coefficient of 1.26 x 10(-6) K-1 in the temperature range of 298 to 1273 K, has been fabricated using calcined powders with an amorphous phase. The calcined powder was prepared by heating mixtures of CsNO3, gamma-AI(2)O(3), and amorphous SiO2 powders at 798 K in air for 20 h, repeated 10 times. The repetition of the heat treatment at 798 K was performed to decompose CsNO3 thoroughly in the mixed raw powders and to obtain calcined powders with a high specific surface area. The relative density of the sintered bodies fabricated from the green compact of the amorphous calcined powder increased with increasing sintering temperature and heating rate. The sintered body with a relative density of ca. 96%, of a well-crystallized pollucite single phase and with the grain size in the range of 0.75-4.75 mu m, was fabricated by heating the green compact of the amorphous powders at 1673 K in air for 20 h at a heating rate of 20 K/min.
  英語
  DOI：https://doi.org/10.1111/j.1551-2916.2005.00703.x
  DOI ID：10.1111/j.1551-2916.2005.00703.x, ISSN：0002-7820, eISSN：1551-2916, CiNii Articles ID：80017646474, Web of Science ID：WOS:000234482600028
• Effect of Ball-milling on Porous Structure of Ca-substituted Leucite with Low Thermal Expansion Property　　　　　　　　　　　　　　　
  I.Yanase; Y.Ishikawa; H.Kobayashi
  巻：114, 号：1336, 開始ページ：1115, 終了ページ：1120, 2006年
  DOI：https://doi.org/10.2109/jcersj.114.1115
  DOI ID：10.2109/jcersj.114.1115, ISSN：0914-5400
• Effects of PMMA on porous structure of pollucite　　　　　　　　　　　　　　　
  Yanase, I; Y Ishikawa; S Matsuura; H Kobayashi
  巻：26, 号：4-5, 開始ページ：475, 終了ページ：479, 2006年
  The effects of PMMA as a pore-forming reagent and the powder for Cs-deficient pollucite, Cs9Al0.9Si2.1O6, calcined at 1073 K, on the microstructure of the porous body of Cs0.9Al0.9Si2.1O6 were investigated. The Cs0.9Al0.9Si2.1O6 porous bodies were fabricated by sintering the green compacts of the calcined powder and PMMA adding 35 mass% to the calcined powder. When the green compact was heated at 873 K in air for 20 h, pores < 1 mu m were observed in the porous body, suggesting that the PMMA previously dissolved in acetone was uniformly distributed in the calcined powder by the ball milling. The pore size of the obtained porous structure increased with increasing the size of the aggregated particles and the pore size distribution was significantly related to the size of Al2O3 balls and the time for the ball milling for mixing the calcined powders and PMMA. (c) 2005 Elsevier Ltd. All rights reserved.
  英語
  DOI：https://doi.org/10.1016/j.jeurceramsoc.2005.07.011
  DOI ID：10.1016/j.jeurceramsoc.2005.07.011, ISSN：0955-2219, CiNii Articles ID：80017664673, Web of Science ID：WOS:000234910700020
• Ca-substituted Pollucite Body Fabricated from Amorphous Calcined Powder　　　　　　　　　　　　　　　
  I.Yanase; Y.Ishikawa; H.Kobayashi
  巻：1, 開始ページ：103, 終了ページ：106, 2006年
• Structural phase transition of Na-substituted Cs-leucite compounds in the range 123-1173 K　　　　　　　　　　　　　　　
  Ikuo Yanase; Kana Ichiyoshi; Hidehiko Kobayashi
  巻：139, 号：1, 開始ページ：1, 終了ページ：4, 2006年
  (Cs,Na)-leucites, Cs1-xNaxAlSi2O6 (X=0.1, 0.2, 0.3), in which Cs+ ions were replaced by Na+ ions, were synthesized by a multistep heat treatment as a solid-state reaction. All the synthesized (Cs,Na)-leucites were well crystallized, which were identified as poliucite-related compounds. XRD study revealed that the (Cs,Na)-leucites were found to be undergo the structural phase transition of tetragonal to cubic in viewpoint of the splitting of the diffraction peak of the (800) plane of the synthesized (Cs,Na)-leucites. The structural phase transition was found to shift to lower temperatures with increasing amount of Na+ ions, without the change in the molar ratio of AL/Si in CsAlSi2O6. (c) 2006 Elsevier Ltd. All rights reserved.
  英語
  DOI：https://doi.org/10.1016/j.ssc.2006.05.016
  DOI ID：10.1016/j.ssc.2006.05.016, ISSN：0038-1098, CiNii Articles ID：80019082810, Web of Science ID：WOS:000239413800001
• Effect of Ball-milling on Porous Structure of Ca-substituted Leucite with Low Thermal Expansion Property　　　　　　　　　　　　　　　
  I.Yanase; Y.Ishikawa; H.Kobayashi
  巻：114, 号：1336, 開始ページ：1115, 終了ページ：1120, 2006年
  DOI：https://doi.org/10.2109/jcersj.114.1115
  DOI ID：10.2109/jcersj.114.1115, ISSN：0914-5400
• 高強度なコーディエライト／ジルコン複合焼結体の作製　　　　　　　　　　　　　　　
  柳瀬郁夫; 片岡弓子; 川口弘幸; 小林秀彦
  巻：第6号, 開始ページ：75, 終了ページ：78, 2006年
• ナノ空間制御による超低熱膨張を示す新規セラミックスの創製　　　　　　　　　　　　　　　
  柳瀬郁夫
  巻：平成17年度, 開始ページ：173, 終了ページ：174, 2006年
• 二酸化炭素吸収能を有する高耐熱性ゼオライト多孔質体の創製　　　　　　　　　　　　　　　
  柳瀬郁夫
  巻：第7号, 開始ページ：43, 終了ページ：46, 2006年
• Fabrication of low thermal expansion porous body of cubic cesium-deficient type pollucite　　　　　　　　　　　　　　　
  Yanase, I; S Tamai; S Matsuura; H Kobayashi
  巻：25, 号：13, 開始ページ：3173, 終了ページ：3179, 2005年08月
  Porous bodies of cubic Cs-deficient pollucite, Cs0.9Al0.9Si2.1O6, were fabricated by using pollucite-calcined powder and polymethyl methacrylate (PMMA), as a pore-forming agent. Porous structure with 0.37 mu m in pore-size and 48.4% in porosity was obtained by heating the green compact of the 1073 K-calcined powder including 35 mass% PMMA at 873 K in air for 20 h to decompose PMMA, following at 1673 K in air for 20 h. The porous structure was formed via the process that small pores resulted from the PMMA decomposition, enlarged and grain growth occurred together with the neck formation with increasing the heating temperature. The fabricated Cs0.9Al0.9Si2.1O6 porous body had the low thermal expansion property of which the linear thermal expansion coefficient was ca. 1.0 x 10(-6) K-1 in the temperature range of 298-1273 K. (c) 2004 Elsevier Ltd. All rights reserved.
  英語
  DOI：https://doi.org/10.1016/j.jeurceramsoc.2004.06.020
  DOI ID：10.1016/j.jeurceramsoc.2004.06.020, ISSN：0955-2219, CiNii Articles ID：80017393954, Web of Science ID：WOS:000230885700011
• 高強度なコーディエライト/ジルコン複合焼結体の作製　　　　　　　　　　　　　　　
  柳瀬 郁夫; 片岡 弓子; 川口 弘幸; 小林 秀彦
  埼玉大学地域共同研究センター紀要, 巻：6, 号：6, 開始ページ：75, 終了ページ：78, 2005年
  Calcination at 1273 K for 24 h for raw materials of talc, kaolin, feldsper, alumina, silica, and zircon to decompose talc and kaolin, followed a ballmilling treatment, was effective for increasing crystallinity of cordierite phase and relative density of the fabricated sintered body compared to a case of using an unheated powder only ballmilled. Thermal expansion rate of the fabricated sintered body decreased with increasing the sintering temperature, due to phase formation of cordierite with thermal expansion rate lower than zircon. Bending strength of the sintered body was lowered because the pore produce derived from talc crystal was suppressed by combination of the calcination and ballmilling treatment.
  埼玉大学総合研究機構地域共同研究センター産学連携推進部門, 日本語
  ISSN：1347-4758, CiNii Articles ID：120001371344, CiNii Books ID：AA11808968
• コーディエライト／ジルコン焼結体の緻密化　　　　　　　　　　　　　　　
  柳瀬郁夫; 荒井教和; 川口弘幸; 小林秀彦
  [2004年度]埼玉大学地域共同センター紀要, 号：5, 開始ページ：69, 終了ページ：73, 2005年
• 超低熱膨張性と排ガス浄化能を有する複合機能性 ゼオライト多孔体の創製　　　　　　　　　　　　　　　
  柳瀬郁夫; 柿崎浩一; 小林秀彦
  2004年度埼玉大学紀要工学部, 開始ページ：128, 終了ページ：131, 2005年
• 高強度なコーディエライト/ジルコン複合焼結体の作製　　　　　　　　　　　　　　　
  柳瀬 郁夫; 片岡 弓子; 川口 弘幸; 小林 秀彦
  埼玉大学地域共同研究センター紀要, 巻：6, 号：6, 開始ページ：75, 終了ページ：78, 2005年
  Calcination at 1273 K for 24 h for raw materials of talc, kaolin, feldsper, alumina, silica, and zircon to decompose talc and kaolin, followed a ballmilling treatment, was effective for increasing crystallinity of cordierite phase and relative density of the fabricated sintered body compared to a case of using an unheated powder only ballmilled. Thermal expansion rate of the fabricated sintered body decreased with increasing the sintering temperature, due to phase formation of cordierite with thermal expansion rate lower than zircon. Bending strength of the sintered body was lowered because the pore produce derived from talc crystal was suppressed by combination of the calcination and ballmilling treatment.
  埼玉大学総合研究機構地域共同研究センター産学連携推進部門, 日本語
  ISSN：1347-4758, CiNii Articles ID：120001371344, CiNii Books ID：AA11808968
• コーディエライト／ジルコン焼結体の緻密化　　　　　　　　　　　　　　　
  柳瀬郁夫; 荒井教和; 川口弘幸; 小林秀彦
  号：5, 開始ページ：69, 終了ページ：73, 2005年
• 超低熱膨張性と排ガス浄化能を有する複合機能性ゼオライト多孔体の創製<研究成果報告>
  柳瀬 郁夫; 柿崎 浩一; 小林 秀彦
  埼玉大学紀要. 工学部 第1編 第1部 論文集, 巻：38, 開始ページ：128, 終了ページ：131, 2005年
  Porous bodies of cubic Cs-deficient pollucite, Cs0.9Al0.9Si2.1O6, were fabricated by using pollucite-calcined powder and polymethyl methacrylate, PMMA, as a pore-forming agent. Porous structure with 0.68μm and 3.80μm in pore-size and 53 % in porosity was obtained by heating the green compact of the 1073K-calcined powder including 35mass% PMMA at 873K in air for 20h to decompose PMMA, following at 1673K in air for 20h. The porous structure was formed via the process that small pores resulted from the PMMA decomposition, enlarged and grain growth occurred together with the neck formation with increasing the heating temperature. The fabricated Cs0.9Al0.9Si2.1O6 porous body had the low thermal expansion property of which the linear thermal expansion coefficient was ca. 1.0×10-6/K in the temperature range of 298 to 1273K.
  埼玉大学工学部, 日本語
  ISSN：1880-4446, CiNii Articles ID：120001370772
• Synthesis of Cubic Cs-deficient Pollucite and its Low Thermal Expansion Property　　　　　　　　　　　　　　　
  S.Tamai; I.Yanase; H.Kobayashi
  Journal of the Ceramic Society of Japan, 112, pp.1358-1363 (2004), 巻：112, 号：1305 (CD-ROM) 付録, 開始ページ：S1358-S1363, 2004年
  DOI：https://doi.org/10.14852/jcersjsuppl.112.0.S1358.0
  DOI ID：10.14852/jcersjsuppl.112.0.S1358.0
• Synthesis of Cubic Cs-deficient Pollucite and its Low Thermal Expansion Property　　　　　　　　　　　　　　　
  S.Tamai; I.Yanase; H.Kobayashi
  巻：112, 号：1305 (CD-ROM) 付録, 開始ページ：S1358-S1363, 2004年
  DOI：https://doi.org/10.14852/jcersjsuppl.112.0.S1358.0
  DOI ID：10.14852/jcersjsuppl.112.0.S1358.0
• Low-thermal-expansion properties of sodium- and lithium-substituted cubic cesium leucite compounds　　　　　　　　　　　　　　　
  Yanase, I; S Tamai; H Kobayashi
  巻：86, 号：8, 開始ページ：1360, 終了ページ：1364, 2003年08月
  Cubic cesium leucite-based compounds, namely cesium leucites, cesium sodium leucites, and cesium lithium leucites, were synthesized using a multistep solid-state reaction method. The thermal expansion properties, in the temperature range of 298-1273 K, for the synthesized cubic cesium leucite-based compounds were examined using high-temperature powder X-ray diffractometry data. The thermal expansions of the cubic cesium leucite-based compounds were found to vary with the chemical composition. For instance, the thermal expansions of Cs0.7Na0.2Al0.9Si2.1O6 and Cs1.7Li0.2Al0.9Si2.1O6 were 0.14% at 1273 K and 0.081% at 1073 K, values lower than those of Cs0.9Al0.9Si2.1O6, which were 0.16% at 1073 K and 0.2% at 1273 K. The results showed that the thermal expansions of the cubic cesium leucite-based compounds changed with ionic substitution at the Cs+ sites because of ionic size differences between Cs+ and the Na+ or Li+ substitutional ions.
  英語
  DOI：https://doi.org/10.1111/j.1151-2916.2003.tb03476.x
  DOI ID：10.1111/j.1151-2916.2003.tb03476.x, ISSN：0002-7820, eISSN：1551-2916, Web of Science ID：WOS:000184885700019
• Sintering of Pollucite by Using Amorphous Powder and Its Low Thermal Expansion Property　　　　　　　　　　　　　　　
  Yanase,I; Tamai,S; Kobayashi,H
  J.Ceram.Soc.Jpn., 巻：111, 号：1296, 開始ページ：533, 終了ページ：536, 2003年
  DOI：https://doi.org/10.2109/jcersj.111.533
  DOI ID：10.2109/jcersj.111.533, ISSN：0914-5400
• 非晶質仮焼粉末を用いたポルーサイトの焼結とその低熱膨張特性　　　　　　　　　　　　　　　
  柳瀬 郁夫; 玉井 幸子; 小林 秀彦
  日本セラミックス協会学術論文誌, 巻：111, 号：1296, 開始ページ：533, 終了ページ：536, 2003年
  Calcined powders were prepared for sintering of cubic Cs 0.9gAl0.9Si2.1O6 by calcining a mixture of Al2O3/SiO2 fine powder and CsNO 3 powder at temperatures of 798 to 1123 K for 20 h in air. The amorphous phase produced in the case of a lower calcination temperature, while the crystallinity of the calcined powder increased with increasing calcination temperature. Densification of the Cs0.9Al0.9Si 2.1O6 green body was significantly enhanced using the amorphous calcined powder. The relative density of the Cs0.9gAl 0.9Si2.1O6 sintered body reached 94.5% when the green body of the amorphous calcined powder, including a slight amount of CsNO3, was sintered at 1673 K for 20 h in air. The dense cubic Cs0.9gAl0.9Si2.1O6 sintered body showed linear thermal expansion without hysteresis, resulting in a thermal expansion rate of ca. 0.13% at 1273 K.
  英語
  DOI：https://doi.org/10.2109/jcersj.111.533
  DOI ID：10.2109/jcersj.111.533, ISSN：0914-5400, CiNii Articles ID：110002292057, SCOPUS ID：0141644148
• Low Thermal Expansion Properties of Na, Li-substituted Cubic Cs-leucite Compounds　　　　　　　　　　　　　　　
  Yanase,I; Tamai,S; Kobayashi,H
  J.Am.Ceram.Soc., 86, pp.1360-1364 (2003), 巻：86, 号：8, 開始ページ：1360, 終了ページ：1364, 2003年
  DOI：https://doi.org/10.1111/j.1151-2916.2003.tb03476.x
  DOI ID：10.1111/j.1151-2916.2003.tb03476.x
• コンビナトリアル湿式・乾式合成手法による無機機能材料の探索　　　　　　　　　　　　　　　
  藤本憲次郎; 高田和典; 柳瀬郁夫; 佐々木高義; 伊藤滋; 渡辺遵
  表面, 巻：41, 号：2, 開始ページ：22, 終了ページ：29, 2003年
• コンビナトリアルケミストリーを利用した電池材料合成
  高田和典; 藤本憲次郎; 柳瀬郁夫; 渡辺遵
  電池技術, 巻：15, 開始ページ：47, 終了ページ：54, 2003年
  電気化学会電池技術委員会, 日本語
  CiNii Articles ID：40005898450
• Sintering of Pollucite by Using Amorphous Powder and Its Low Thermal Expansion Property　　　　　　　　　　　　　　　
  Yanase,I; Tamai,S; Kobayashi,H
  巻：111, 号：1296, 開始ページ：533, 終了ページ：536, 2003年
  DOI：https://doi.org/10.2109/jcersj.111.533
  DOI ID：10.2109/jcersj.111.533, ISSN：0914-5400
• 非晶質仮焼粉末を用いたポルーサイトの焼結とその低熱膨張特性　　　　　　　　　　　　　　　
  柳瀬 郁夫; 玉井 幸子; 小林 秀彦
  巻：111, 号：1296, 開始ページ：533, 終了ページ：536, 2003年
  DOI：https://doi.org/10.2109/jcersj.111.533
  DOI ID：10.2109/jcersj.111.533, ISSN：0914-5400, CiNii Articles ID：110002292057
• コンビナトリアル湿式・乾式合成手法による無機機能材料の探索　　　　　　　　　　　　　　　
  藤本憲次郎; 高田和典; 柳瀬郁夫; 佐々木高義; 伊藤滋; 渡辺遵
  巻：41, 号：2, 開始ページ：22, 終了ページ：29, 2003年
• コンビナトリアルケミストリーを利用した電池材料合成
  高田 和典; 藤本 憲次郎; 柳瀬 郁夫
  電池技術, 巻：15, 開始ページ：47, 終了ページ：54, 2003年
  電気化学会電池技術委員会, 日本語
  CiNii Articles ID：40005898450
• Combinatorial study for ceramics powder by X-ray diffraction　　　　　　　　　　　　　　　
  Yanase, I; T Ohtaki; M Watanabe
  巻：154, 開始ページ：419, 終了ページ：424, 2002年12月
  Application of ceramics powder synthesis through solid and liquid processes to combinatorial chemistry is thought to be of much importance to expansion of material research field. Combinatorial robot system developed in our laboratory has the possibility of performing combinatorial synthesis through a liquid process. The robot system has an automatic arm. Automatic micropipette, attached to the arm, measures and mixes raw materials. Mixed samples were injected and carried to a pallet with many holes where the samples were sucked. The pallet filled with samples was heated in an electrical furnace. In this study, combinatorial powder XRD equipment with position-sensitive proportional counter (PSPC) was developed, which was able to measure a sample in only 2 min. Furthermore, combinatorial robot system and combinatorial X-ray diffraction clarified the influence of dopants on the structural phase transformation temperature of maghemite to hematite in case of using nanoparticle slurries as starting materials. Consequently, it was clarified that the structural phase transformation temperature of maghemite to hematite increased with increasing the adding amount of yttria nanoparticles and the temperature increased from ca. 540 to 820 degreesC by 2 at.% yttria addition. (C) 2002 Elsevier Science B.V All rights reserved.
  英語
  DOI：https://doi.org/10.1016/S0167-2738(02)00581-7
  DOI ID：10.1016/S0167-2738(02)00581-7, ISSN：0167-2738, CiNii Articles ID：80015711371, Web of Science ID：WOS:000179999700058
• Application of Combinatorial Process to LiCo1-XMnXO2 ( 0≦X≦0.2 )Powders Synthesis　　　　　　　　　　　　　　　
  Yanase,I; Ohtaki,T; Watanabe,M
  Solid State Ionics, 巻：151, 号：1-4, 開始ページ：189, 終了ページ：196, 2002年11月
  Combinatorial process was applied to the synthesis of layered lithium cobalt manganese oxides using a combinatorial robot system in preparing mixtures of liquid samples and using a combinatorial X-ray diffraction (XRD) apparatus in investigating powders. LiCo1-xMnxO2 (X=0.0, 0.1, 0.2) single phases were synthesized at 1073 K for 5 h in air using LiOH, Co(CH3COO)(2) and Mn(CH3COO)(2) aqueous solutions with molar ratio of Li/(Co + Mn) greater than or equal to 1.3 in mixed solutions. The 16 heated samples in holes of 5-mm diameter and 2-mm depth of a Pt pallet with a size of 35 x 35 x 3 mm were investigated one by one automatically using a combinatorial powder XRD (CrKalpha) apparatus with position-sensitive diffraction counter (PSPC). The device spent 2 min to measure one sample. The results were in good agreement with that obtained by powder XRD (CuKalpha) with a goniometer.
  (C) 2002 Elsevier Science B.V. All rights reserved.
  英語
  DOI：https://doi.org/10.1016/S0167-2738(02)00709-9
  DOI ID：10.1016/S0167-2738(02)00709-9, ISSN：0167-2738, eISSN：1872-7689, CiNii Articles ID：80015658802, Web of Science ID：WOS:000179681400027
• Application of combinatorial process to LiCo1-XMnXO2 (0 <= X <= 0.2) powder synthesis　　　　　　　　　　　　　　　
  Yanase, I; T Ohtaki; M Watanabe
  巻：151, 号：1-4, 開始ページ：189, 終了ページ：196, 2002年11月
  Combinatorial process was applied to the synthesis of layered lithium cobalt manganese oxides using a combinatorial robot system in preparing mixtures of liquid samples and using a combinatorial X-ray diffraction (XRD) apparatus in investigating powders. LiCo1-xMnxO2 (X=0.0, 0.1, 0.2) single phases were synthesized at 1073 K for 5 h in air using LiOH, Co(CH3COO)(2) and Mn(CH3COO)(2) aqueous solutions with molar ratio of Li/(Co + Mn) greater than or equal to 1.3 in mixed solutions. The 16 heated samples in holes of 5-mm diameter and 2-mm depth of a Pt pallet with a size of 35 x 35 x 3 mm were investigated one by one automatically using a combinatorial powder XRD (CrKalpha) apparatus with position-sensitive diffraction counter (PSPC). The device spent 2 min to measure one sample. The results were in good agreement with that obtained by powder XRD (CuKalpha) with a goniometer.
  (C) 2002 Elsevier Science B.V. All rights reserved.
  英語
  DOI：https://doi.org/10.1016/S0167-2738(02)00709-9
  DOI ID：10.1016/S0167-2738(02)00709-9, ISSN：0167-2738, eISSN：1872-7689, CiNii Articles ID：80015658802, Web of Science ID：WOS:000179681400027
• Combinatorial study on nano-particle mixture prepared by robot system　　　　　　　　　　　　　　　
  Yanase, I; T Ohtaki; M Watanabe
  巻：189, 号：3-4, 開始ページ：292, 終了ページ：299, 2002年04月
  We have developed a combinatorial robot system for measuring, mixing and molding liquid samples with an automatic micropipette, which produces a group of sample libraries for ceramic powders on a reaction pallet. In this study, metal oxide nano-particle slurries and inorganic solutions were used as starting raw materials. Either of these starting materials was confirmed to become homogeneous mixtures with automatic mixing operation on the basis of a few experimental examples such as the synthesis of multi-component compounds. Homogeneous slurry mixtures were almost as reactive as gels obtained by sol-gel methods and also their slurries could be treated much more easily than sols. Nano-particle slurries were confirmed to be excellent starting raw materials for combinatorial powder synthesis with this robot system. (C) 2002 Elsevier Science B.V. All rights reserved.
  英語
  DOI：https://doi.org/10.1016/S0169-4332(01)01006-6
  DOI ID：10.1016/S0169-4332(01)01006-6, ISSN：0169-4332, CiNii Articles ID：80015333503, Web of Science ID：WOS:000176733600020
• Development of robot system and x-ray powder diffraction for combinatorial materials research　　　　　　　　　　　　　　　
  Yanase, I; K Fujimoto; K Takada; T Ohtaki; M Watanabe
  巻：700, 開始ページ：159, 終了ページ：165, 2002年
  We developed a combinatorial robot system as the first step of combinatorial approach to wet and dry synthesis of ceramics. In this study, nanoparticles mixtures having maghemite and a small amount of Y2O3 were prepared successively by using the combinatorial robot system. maghemite and Y2O3 slurries were volumetrically and automatically measured and mixed by repetition of sucking and injecting with a micro-pipette attached to the robot arm. The structural phase transition temperature of maghemite to hematite, which was investigated from the exothermic peak in the DTA curve, increased from ca.813K to ca.1093K by 2atom%Y2O3 addition. It was considered that Y2O3 dissolution into the crystal structure of maghemite had an important role on increasing the temperature of the structural phase transition for stabilizing maghemite phase. (Combinatorial, Slurries, Maghemite, Nanoparticles, Phase transition).
  英語
  ISSN：0272-9172, Web of Science ID：WOS:000177251700021
• Development of robot system and x-ray powder diffraction for combinatorial materials research　　　　　　　　　　　　　　　
  Yanase, I; K Fujimoto; K Takada; T Ohtaki; M Watanabe
  巻：700, 開始ページ：159, 終了ページ：165, 2002年
  We developed a combinatorial robot system as the first step of combinatorial approach to wet and dry synthesis of ceramics. In this study, nanoparticles mixtures having maghemite and a small amount of Y2O3 were prepared successively by using the combinatorial robot system. maghemite and Y2O3 slurries were volumetrically and automatically measured and mixed by repetition of sucking and injecting with a micro-pipette attached to the robot arm. The structural phase transition temperature of maghemite to hematite, which was investigated from the exothermic peak in the DTA curve, increased from ca.813K to ca.1093K by 2atom%Y2O3 addition. It was considered that Y2O3 dissolution into the crystal structure of maghemite had an important role on increasing the temperature of the structural phase transition for stabilizing maghemite phase. (Combinatorial, Slurries, Maghemite, Nanoparticles, Phase transition).
  英語
  ISSN：0272-9172, Web of Science ID：WOS:000177251700021
• Lithium ion conduction in LiTi2(PO4)(3)　　　　　　　　　　　　　　　
  K Takada; M Tansho; Yanase, I; T Inada; A Kajiyama; M Kouguchi; S Kondo; M Watanabe
  巻：139, 号：3-4, 開始ページ：241, 終了ページ：247, 2001年02月
  Li+ ion conduction was examined for a mixture of LiTi2(PO4)(3) (LTP) and a glassy electrolyte. 0.01Li(3)PO(4)-0.63Li(2)S-0.36SiS(2). The addition of LTP with 10 wt.% resulted in a significant decrease in activation energy for conduction and little influence on the Lif ion conductivity, although it reduced the conduction path in the glass. The Li-7 NMR spectra of LTP was quite similar to that of Li1.3Al0.3Ti1.7(PO4)(3) (LATP) with a high conductivity of 10(-3) S cm(-1). These results suggest that Li+ ion conduction in LTP is as high as that in the glassy electrolyte and LATP. (C) 2001 Elsevier Science B.V. All rights reserved.
  英語
  DOI：https://doi.org/10.1016/S0167-2738(01)00688-9
  DOI ID：10.1016/S0167-2738(01)00688-9, ISSN：0167-2738, CiNii Articles ID：80012314296, Web of Science ID：WOS:000167665100009
• 粉末法高温・低温X線回折による合成ポルーサイトの熱膨張特性評価　　　　　　　　　　　　　　　
  柳瀬郁夫
  CACS FORUM, 巻：21, 開始ページ：54-59(18-21), 2001年
• 粉末法高温・低温X線回折による合成ポルーサイトの熱膨張特性評価　　　　　　　　　　　　　　　
  柳瀬 郁夫
  CACS forum, 巻：21, 開始ページ：54-59(18-21), 終了ページ：21, 2001年
  The thermal expansion properties of the synthesized CsAlSi2O6 and Cs0.9Al0.9Si2.1O6, prepared by the solid-state reaction of CsNO3 powder and Al2O3 and SiO2 powders, were investigated by powder high- and low-temperature X-ray diffractions in the temperature range of 123 to 1273 K. The thermal expansion rate of Cs0.9Al0.9Si2.1O6 was smaller than that of CsAlSi2O6 in the temperature range of 298 to 1273 K of which the crystal systems were cubic with space group Ia-3d. On the other hand, CsAlSi2O6 and Cs0.9Al0.9Si2.1O6 underwent a structural phase transformation of tetragonal to cubic in the temperature range of 223 to 273 and of 123 to 173 K, respectively. A large thermal expansion in the range of 298 to 373 K observed in the property of CsAlSi2O6 was similarly observed in the range of 173 to 273 K in the property of Cs0.9Al0.9Si2.1O6. The results suggested that lowering of the structural phase transformation temperature was due to decreasing the thermal expansion rate of Cs0.9Al0.9Si2.1O6 above room temperature.
  埼玉大学分析センター, 日本語
  CiNii Articles ID：120001686773, CiNii Books ID：AN10402595
• Cs2FeSi5O12 Powder Synthesis in Ar Atmosphare and Its Thermal Expansion Property　　　　　　　　　　　　　　　
  Yanase,I; Kobayashi,H; Mitamura,T
  J.Ceram.Soc.Jpn, 巻：108, 号：1259, 開始ページ：677, 終了ページ：680, 2000年
  rights: 社団法人日本セラミックス協会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: isVersionOf: http://ci.nii.ac.jp/naid/110002289877/Cubic Cs_2FeSi_5O_<12> powder with the space group Iα-3d was synthesized by heating the powder mixture of Cs_2CO_3・2H_2O, Fe_3O_4 and amorphous SiO_2 with the molar ratio of Cs/Fe=2 and Si/Fe=5 at 1273 K for 20 h under Ar gas flow. The thermal expansion property of cubic Cs_2FeSi_5O_<12> powder was investigated in the temperature range from 298 to 1273 K using high-temperature X-ray diffraction. The thermal expansion rate of cubic Cs_2FeSi_5O_<12> was lower than that of cubic CsFeSi_2O_6. Consequently, increasing the molar ratio of Si/Fe was effective for decreasing the thermal expansion rate of Cs-Fe-leucite compounds. Cubic Cs_2FeSi_5O_<12> showed a lower thermal expansion with the mean linear thermal expansion coefficient of 1.75×10^<-6>K^<-1> in the range from 573 to 1273 K.
  公益社団法人日本セラミックス協会, 英語
  DOI：https://doi.org/10.2109/jcersj.108.1259_677
  DOI ID：10.2109/jcersj.108.1259_677, ISSN：0914-5400, CiNii Articles ID：110002289877, CiNii Books ID：AN10040326
• Ar雰囲気中での立方晶Cs_2FeSi_5O_<12>粉末の合成とその熱膨張特性　　　　　　　　　　　　　　　
  柳瀬 郁夫; 小林 秀彦; 三田村 孝
  日本セラミックス協会学術論文誌, 巻：108, 号：1259, 開始ページ：677, 終了ページ：680, 2000年
  DOI：https://doi.org/10.2109/jcersj.108.1259_677
  DOI ID：10.2109/jcersj.108.1259_677
• セラミックス合成プロセスのコンビナトリアル化　　　　　　　　　　　　　　　
  渡辺遵; 柳瀬郁夫; 高田和典
  化学工業, 巻：51, 号：4, 開始ページ：54-59(302-307), 終了ページ：307, 2000年
  化学工業社, 日本語
  ISSN：0451-2014, CiNii Articles ID：40000415634, CiNii Books ID：AN00037245
• Thermal Expansion Property of Synthetic Cubic Leucite-type Compounds　　　　　　　　　　　　　　　
  Yanase.I; Kobayashi, H; Mitamura, T
  J.Ceram.Soc.Jpn, 巻：108, 号：1253, 開始ページ：26, 終了ページ：31, 2000年
  DOI：https://doi.org/10.2109/jcersj.108.26
  DOI ID：10.2109/jcersj.108.26, ISSN：0914-5400
• 合成した立方晶系リューサイト型化合物の熱膨張特性　　　　　　　　　　　　　　　
  小林 秀彦; 柳瀬 郁夫; 三田村 孝
  日本セラミックス協会学術論文誌, 巻：108, 号：1253, 開始ページ：26, 終了ページ：31, 2000年
  DOI：https://doi.org/10.2109/jcersj.108.26
  DOI ID：10.2109/jcersj.108.26, ISSN：0914-5400, CiNii Articles ID：110002290021
• Ar雰囲気中での立方晶Cs_2FeSi_5O_<12>粉末の合成とその熱膨張特性　　　　　　　　　　　　　　　
  柳瀬 郁夫; 小林 秀彦; 三田村 孝
  日本セラミックス協会学術論文誌 : Nippon Seramikkusu Kyokai gakujutsu ronbunshi, 巻：108, 号：1259, 開始ページ：677, 終了ページ：680, 2000年
  rights: 社団法人日本セラミックス協会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: isVersionOf: http://ci.nii.ac.jp/naid/110002289877/Cubic Cs_2FeSi_5O_<12> powder with the space group Iα-3d was synthesized by heating the powder mixture of Cs_2CO_3・2H_2O, Fe_3O_4 and amorphous SiO_2 with the molar ratio of Cs/Fe=2 and Si/Fe=5 at 1273 K for 20 h under Ar gas flow. The thermal expansion property of cubic Cs_2FeSi_5O_<12> powder was investigated in the temperature range from 298 to 1273 K using high-temperature X-ray diffraction. The thermal expansion rate of cubic Cs_2FeSi_5O_<12> was lower than that of cubic CsFeSi_2O_6. Consequently, increasing the molar ratio of Si/Fe was effective for decreasing the thermal expansion rate of Cs-Fe-leucite compounds. Cubic Cs_2FeSi_5O_<12> showed a lower thermal expansion with the mean linear thermal expansion coefficient of 1.75×10^<-6>K^<-1> in the range from 573 to 1273 K.
  公益社団法人日本セラミックス協会, 英語
  DOI：https://doi.org/10.2109/jcersj.108.1259_677
  DOI ID：10.2109/jcersj.108.1259_677, ISSN：0914-5400, CiNii Articles ID：110002289877, CiNii Books ID：AN10040326
• Ar雰囲気中での立方晶Cs_2FeSi_5O_<12>粉末の合成とその熱膨張特性　　　　　　　　　　　　　　　
  柳瀬 郁夫; 小林 秀彦; 三田村 孝
  巻：108, 号：1259, 開始ページ：677, 終了ページ：680, 2000年
  DOI：https://doi.org/10.2109/jcersj.108.1259_677
  DOI ID：10.2109/jcersj.108.1259_677
• セラミックス合成プロセスのコンビナトリアル化　　　　　　　　　　　　　　　
  渡辺 遵; 柳瀬 郁夫; 高田 和典
  化学工業, 巻：51, 号：4, 開始ページ：54-59(302-307), 終了ページ：307, 2000年
  化学工業社, 日本語
  ISSN：0451-2014, CiNii Articles ID：40000415634, CiNii Books ID：AN00037245
• Thermal Expansion Property of Synthetic Cubic Leucite-type Compounds　　　　　　　　　　　　　　　
  Yanase.I; Kobayashi, H; Mitamura, T
  巻：108, 号：1253, 開始ページ：26, 終了ページ：31, 2000年
  DOI：https://doi.org/10.2109/jcersj.108.26
  DOI ID：10.2109/jcersj.108.26, ISSN：0914-5400
• 合成した立方晶系リューサイト型化合物の熱膨張特性　　　　　　　　　　　　　　　
  小林 秀彦; 柳瀬 郁夫; 三田村 孝
  巻：108, 号：1253, 開始ページ：26, 終了ページ：31, 2000年
  DOI：https://doi.org/10.2109/jcersj.108.26
  DOI ID：10.2109/jcersj.108.26, ISSN：0914-5400, CiNii Articles ID：110002290021
• Thermal property and phase transition of the synthesized new cubic leucite-type compounds　　　　　　　　　　　　　　　
  Yanase, I; H Kobayashi; T Mitamura
  巻：57, 号：3, 開始ページ：695, 終了ページ：705, 1999年09月
  New cubic leucite-type compounds, CsMSi2O6 (M=B0.2Al0.8,Al0.2Fe0.8), Cs2MSi5O12 (M=Cd, Mg, Ni, Zn) have been synthesized by the two-stage heat treatment of the solid-state reaction. The thermal expansion properties of the synthesized leucite-type compounds have been studied with HTXRD and LTXRD in the temperature range of 123 to 1273 K. The thermal expansion rate of CsB0.2Al0.8Si2O6 was found to be considerably smaller than that of CsAlSi2O6, while the thermal expansion property of Cs2MSi5O12 (M=Mg, Zn, Cd) was found to have a linear relationship in the temperature range of 298 to 1273 K. By using Rietveld analysis it was found that the thermal expansion rate decreased with increasing the Si-O-M(Si) angle for cubic leucite-type compounds at 298 K, and that the phase transitions of CsAlSi2O6 and Cs0.9Al0.9Si2.1O6 were due to the relationship between the bond angle of Si-O-M(Si) of the three-dimensional framework structure and the space ratio in the unit cell at 298 K.
  英語
  DOI：https://doi.org/10.1023/A:1010144815304
  DOI ID：10.1023/A:1010144815304, ISSN：1418-2874, CiNii Articles ID：80010762582, Web of Science ID：WOS:000083716900009
• 立方晶系Cs_2MSi_5O_<12>(M=Cd,Ni,Zn)の粉末合成と熱膨張特性　　　　　　　　　　　　　　　
  柳瀬 郁夫; 宮下 徳彦; 小林 秀彦; 野口 文雄; 三田村 孝
  日本セラミックス協会学術論文誌, 巻：106, 号：11, 開始ページ：1099, 終了ページ：1103, 1998年11月
  Monolithic Cs2MSi5O12(M=Cd, Ni, Zn) with cubic symmetry, space group Ia (3) over bar d, was synthesized in air according to a two stage heat treatment. Mixed raw material powders were calcined at 973 to 1023 K for 20 to 40h until the Cs2MSi5O12(M=Cd, Ni, Zn) phase were recognized by XRD and then they were heated at 1273 to 1473 K for 20h. The thermal expansion of the synthesized Cs2MSi5O12(M=Cd, Ni, Zn) powders was investigated using high-temperature X-ray diffraction at 298 to 1273 K. The Cs2MSi5O12(M=Cd, Ni, Zn) powders having SiO4/MO42-=5, displayed a lower thermal expansion than those of CsMSi2O5(M=Al, Fe) having SiO4/MO4- = 2 in the low temperature range. With increasing the ionic radius of M2+, the thermal expansion coefficient of the synthesized Cs2MSi5O12(M=Cd, Ni, Zn) was increased in the low temperature range.
  日本語
  DOI：https://doi.org/10.2109/jcersj.106.1099
  DOI ID：10.2109/jcersj.106.1099, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000077149000011
• Synthesis and thermal expansion property of cubic CS2MSi5O12 (M = Cd, Ni, Zn) powders　　　　　　　　　　　　　　　
  Yanase, I; N Miyashita; H Kobayashi; F Noguchi; T Mitamura
  巻：106, 号：11, 開始ページ：1099, 終了ページ：1103, 1998年11月
  Monolithic Cs2MSi5O12(M=Cd, Ni, Zn) with cubic symmetry, space group Ia (3) over bar d, was synthesized in air according to a two stage heat treatment. Mixed raw material powders were calcined at 973 to 1023 K for 20 to 40h until the Cs2MSi5O12(M=Cd, Ni, Zn) phase were recognized by XRD and then they were heated at 1273 to 1473 K for 20h. The thermal expansion of the synthesized Cs2MSi5O12(M=Cd, Ni, Zn) powders was investigated using high-temperature X-ray diffraction at 298 to 1273 K. The Cs2MSi5O12(M=Cd, Ni, Zn) powders having SiO4/MO42-=5, displayed a lower thermal expansion than those of CsMSi2O5(M=Al, Fe) having SiO4/MO4- = 2 in the low temperature range. With increasing the ionic radius of M2+, the thermal expansion coefficient of the synthesized Cs2MSi5O12(M=Cd, Ni, Zn) was increased in the low temperature range.
  日本語
  DOI：https://doi.org/10.2109/jcersj.106.1099
  DOI ID：10.2109/jcersj.106.1099, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000077149000011
• Synthesis and thermal expansion property of cubic CS2MSi5O12 (M = Cd, Ni, Zn) powders　　　　　　　　　　　　　　　
  Yanase, I; N Miyashita; H Kobayashi; F Noguchi; T Mitamura
  巻：106, 号：11, 開始ページ：1099, 終了ページ：1103, 1998年11月
  Monolithic Cs2MSi5O12(M=Cd, Ni, Zn) with cubic symmetry, space group Ia (3) over bar d, was synthesized in air according to a two stage heat treatment. Mixed raw material powders were calcined at 973 to 1023 K for 20 to 40h until the Cs2MSi5O12(M=Cd, Ni, Zn) phase were recognized by XRD and then they were heated at 1273 to 1473 K for 20h. The thermal expansion of the synthesized Cs2MSi5O12(M=Cd, Ni, Zn) powders was investigated using high-temperature X-ray diffraction at 298 to 1273 K. The Cs2MSi5O12(M=Cd, Ni, Zn) powders having SiO4/MO42-=5, displayed a lower thermal expansion than those of CsMSi2O5(M=Al, Fe) having SiO4/MO4- = 2 in the low temperature range. With increasing the ionic radius of M2+, the thermal expansion coefficient of the synthesized Cs2MSi5O12(M=Cd, Ni, Zn) was increased in the low temperature range.
  日本語
  DOI：https://doi.org/10.2109/jcersj.106.1099
  DOI ID：10.2109/jcersj.106.1099, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:000077149000011
• Tetragonal-to-cubic structural phase transition in pollucite by low-temperature X-ray powder diffraction　　　　　　　　　　　　　　　
  Yanase, I; H Kobayashi; Y Shibasaki; T Mitamura
  巻：80, 号：10, 開始ページ：2693, 終了ページ：2695, 1997年10月
  The tetragonal-to-cubic structural phase transition in pollucite (CsAlSi2O6) was investigated using low-temperature X-ray powder diffraction in the temperature range of 93 to 298 K, and the lattice constants were refined with Rietveld analysis. It was found that CsAlSi2O6 had a tetragonal phase with a space group of I4(1)/acd in the temperature range of 93 to 248 K, a = 1.36337(4) mm, c = 1.36988(6) nm at 248 K, and underwent a phase transition from tetragonal to cubic with a space group of Ia-3d in the temperature range of 248 to 273 K, a = 1.36645(3) nm at 273 K.
  英語
  DOI：https://doi.org/10.1111/j.1151-2916.1997.tb03175.x
  DOI ID：10.1111/j.1151-2916.1997.tb03175.x, ISSN：0002-7820, Web of Science ID：WOS:A1997YB06000029
• Tetragonal-to-cubic structural phase transition in pollucite by low-temperature X-ray powder diffraction　　　　　　　　　　　　　　　
  Yanase, I; H Kobayashi; Y Shibasaki; T Mitamura
  巻：80, 号：10, 開始ページ：2693, 終了ページ：2695, 1997年10月
  The tetragonal-to-cubic structural phase transition in pollucite (CsAlSi2O6) was investigated using low-temperature X-ray powder diffraction in the temperature range of 93 to 298 K, and the lattice constants were refined with Rietveld analysis. It was found that CsAlSi2O6 had a tetragonal phase with a space group of I4(1)/acd in the temperature range of 93 to 248 K, a = 1.36337(4) mm, c = 1.36988(6) nm at 248 K, and underwent a phase transition from tetragonal to cubic with a space group of Ia-3d in the temperature range of 248 to 273 K, a = 1.36645(3) nm at 273 K.
  英語
  DOI：https://doi.org/10.1111/j.1151-2916.1997.tb03175.x
  DOI ID：10.1111/j.1151-2916.1997.tb03175.x, ISSN：0002-7820, Web of Science ID：WOS:A1997YB06000029
• A new model for the pollucite thermal expansion mechanism　　　　　　　　　　　　　　　
  H Kobayashi; Yanase, I; T Mitamura
  巻：80, 号：8, 開始ページ：2161, 終了ページ：2164, 1997年08月
  The thermal expansion behavior of cubic pollucite (CsAlSi2O6) in the temperature range 298 to 1473 K was investigated from the viewpoint of crystal structure, based on the model proposed in this study, with Rietveld analysis and high-temperature X-ray powder diffraction. Consequently, it has been found that the CsAlSi2O6 structure provides an enlargement-contraction mechanism for two kinds of rings, each composed of six (Si,Al)O-4 tetrahedra in a three-dimensional aluminosilicate framework, in the temperature range 298 to 673 K.
  英語
  DOI：https://doi.org/10.1111/j.1151-2916.1997.tb03104.x
  DOI ID：10.1111/j.1151-2916.1997.tb03104.x, ISSN：0002-7820, Web of Science ID：WOS:A1997XQ33100031
• A New Model for the Pollucite Thermal Expansion Mechanism　　　　　　　　　　　　　　　
  Kobayashi,H; Yanase,I; Mitamura,T
  巻：80, 号：8, 開始ページ：2161, 終了ページ：2164, 1997年
  The thermal expansion behavior of cubic pollucite (CsAlSi2O6) in the temperature range 298 to 1473 K was investigated from the viewpoint of crystal structure, based on the model proposed in this study, with Rietveld analysis and high-temperature X-ray powder diffraction. Consequently, it has been found that the CsAlSi2O6 structure provides an enlargement - contraction mechanism for two kinds of rings, each composed of six (Si,Al)O4 tetrahedra in a three-dimensional aluminosilicate framework, in the temperature range 298 to 673 K.
  英語
  DOI：https://doi.org/10.1111/j.1151-2916.1997.tb03104.x
  DOI ID：10.1111/j.1151-2916.1997.tb03104.x, ISSN：0002-7820, SCOPUS ID：0031197301

• 柳瀬郁夫 コンビナトリアル(テクノロジー)ケミストリー 明日を開くもの作りの新世界　　　　　　　　　　　　　　　
  丸善, 2004年
• 柳瀬郁夫 コンビナトリアル(テクノロジー)ケミストリー 明日を開くもの作りの新世界　　　　　　　　　　　　　　　
  丸善, 2004年

• マンニトールとホウ酸と用いた炭化ホウ素粉末の合成　　　　　　　　　　　　　　　
  2009年
• CaO板状粒子の調製とCO2吸収特性　　　　　　　　　　　　　　　
  2009年
• 合成したチタノシリケートのCs固定化能　　　　　　　　　　　　　　　
  2009年
• 異なる結晶構造と有するLiFeO2の合成とCO2吸収特性　　　　　　　　　　　　　　　
  2009年
• a-LiFeO2のCO2吸収と構造相転移　　　　　　　　　　　　　　　
  第19回日本MRS学術シンポジウム, 2009年
• 立方晶ZrV2O7関連化合物の合成と熱膨張特性　　　　　　　　　　　　　　　
  第19回日本MRS学術シンポジウム, 2009年
• Al2W3O12関連化合物の合成とサーモクロミック特性　　　　　　　　　　　　　　　
  第19回日本MRS学術シンポジウム, 2009年
• 合成したα-LiFeO2のCO2吸収と構造相転移　　　　　　　　　　　　　　　
  日本セラミックス協会2009年年会, 2009年
• 種々の雰囲気下で合成したCsTiSi2O6.5のイオン交換特性　　　　　　　　　　　　　　　
  日本セラミックス協会2009年年会, 2009年
• マンニトールとホウ酸と用いた炭化ホウ素粉末の合成　　　　　　　　　　　　　　　
  2009年
• CaO板状粒子の調製とCO2吸収特性　　　　　　　　　　　　　　　
  2009年
• 合成したチタノシリケートのCs固定化能　　　　　　　　　　　　　　　
  2009年
• 異なる結晶構造と有するLiFeO2の合成とCO2吸収特性　　　　　　　　　　　　　　　
  2009年
• a-LiFeO2のCO2吸収と構造相転移　　　　　　　　　　　　　　　
  第19回日本MRS学術シンポジウム, 2009年
• 立方晶ZrV2O7関連化合物の合成と熱膨張特性　　　　　　　　　　　　　　　
  第19回日本MRS学術シンポジウム, 2009年
• Al2W3O12関連化合物の合成とサーモクロミック特性　　　　　　　　　　　　　　　
  第19回日本MRS学術シンポジウム, 2009年
• 合成したα-LiFeO2のCO2吸収と構造相転移　　　　　　　　　　　　　　　
  日本セラミックス協会2009年年会, 2009年
• 種々の雰囲気下で合成したCsTiSi2O6.5のイオン交換特性　　　　　　　　　　　　　　　
  日本セラミックス協会2009年年会, 2009年
• Orientation of CaO Particles on Pollucite Foam　　　　　　　　　　　　　　　
  The IUMRS International Conference in Asia 2008, 2008年
• CaO板状粒子が被覆されたリューサイト多孔体の作製とCO2吸収挙動　　　　　　　　　　　　　　　
  第24回関東支部研究発表会, 2008年
  ポスター発表
• 合成したα-LiFeO2粒状粒子のCO2吸収と構造相転移　　　　　　　　　　　　　　　
  第24回関東支部研究発表会, 2008年
• 合成したCs-チタノシリケートのイオン交換　　　　　　　　　　　　　　　
  第24回関東支部研究発表会, 2008年
• Orientation of CaO Particles on Pollucite Foam　　　　　　　　　　　　　　　
  The IUMRS International Conference in Asia 2008, 2008年
• CaO板状粒子が被覆されたリューサイト多孔体の作製とCO2吸収挙動　　　　　　　　　　　　　　　
  第24回関東支部研究発表会, 2008年
  ポスター発表
• 合成したα-LiFeO2粒状粒子のCO2吸収と構造相転移　　　　　　　　　　　　　　　
  第24回関東支部研究発表会, 2008年
• 合成したCs-チタノシリケートのイオン交換　　　　　　　　　　　　　　　
  第24回関東支部研究発表会, 2008年
• Fabrication of CO2 absorption pollucite porous body　　　　　　　　　　　　　　　
  第18回日本MRS学術シンポジウム, 2007年
• Cs不足型ポルーサイトの合成と熱膨張特性　　　　　　　　　　　　　　　
  第23回関東支部研究発表会, 2007年
• 高分子前駆体を用いたB4C粉末の低温合成　　　　　　　　　　　　　　　
  第23回関東支部研究発表会, 2007年
• PVA-H3BO3前駆体からのB4C粉末の低温合成，　　　　　　　　　　　　　　　
  2007年年会, 2007年
• ケイ酸塩セラミックスフォームに被覆したCaO粒子のCO2吸収特性，　　　　　　　　　　　　　　　
  2007年年会，, 2007年
• (Cs,Na)-リューサイト化合物の組成と熱膨張特性，　　　　　　　　　　　　　　　
  2007年年会，, 2007年
• Fabrication of CO2 absorption pollucite porous body　　　　　　　　　　　　　　　
  第18回日本MRS学術シンポジウム, 2007年
• Cs不足型ポルーサイトの合成と熱膨張特性　　　　　　　　　　　　　　　
  第23回関東支部研究発表会, 2007年
• 高分子前駆体を用いたB4C粉末の低温合成　　　　　　　　　　　　　　　
  第23回関東支部研究発表会, 2007年
• PVA-H3BO3前駆体からのB4C粉末の低温合成，　　　　　　　　　　　　　　　
  2007年年会, 2007年
• ケイ酸塩セラミックスフォームに被覆したCaO粒子のCO2吸収特性，　　　　　　　　　　　　　　　
  2007年年会，, 2007年
• (Cs,Na)-リューサイト化合物の組成と熱膨張特性，　　　　　　　　　　　　　　　
  2007年年会，, 2007年
• マイクロ波加熱を用いた沈殿法による塩基性炭酸ニッケルの調製，　　　　　　　　　　　　　　　
  第19回秋季シンポジウム，, 2006年
  ポスター発表
• 高効率CO2吸収用CaO被覆ケイ酸塩セラミックスフォームの開発，　　　　　　　　　　　　　　　
  第19回秋季シンポジウム, 2006年
  ポスター発表
• ポルーサイト化合物の組成と熱膨張特性，　　　　　　　　　　　　　　　
  第22回関東支部研究発表会，, 2006年
• (Al.Si,P)O4四面体骨格構造を有するポルーサイト化合物の合成と熱膨張特性，　　　　　　　　　　　　　　　
  第22回関東支部研究発表会, 2006年
• ホウ酸架橋PVAからのB4C粉末の低温合成，　　　　　　　　　　　　　　　
  第22回関東支部研究発表会, 2006年
• マイクロ波照射下で調製した塩基性炭酸ニッケルの熱分解によるNiO微粒子の合成　　　　　　　　　　　　　　　
  日本セラミックス協会2006年年会講演予稿集，, 2006年
• マイクロ波加熱を用いた沈殿法による塩基性炭酸ニッケルの調製，　　　　　　　　　　　　　　　
  第19回秋季シンポジウム，, 2006年
  ポスター発表
• 高効率CO2吸収用CaO被覆ケイ酸塩セラミックスフォームの開発，　　　　　　　　　　　　　　　
  第19回秋季シンポジウム, 2006年
  ポスター発表
• ポルーサイト化合物の組成と熱膨張特性，　　　　　　　　　　　　　　　
  第22回関東支部研究発表会，, 2006年
• (Al.Si,P)O4四面体骨格構造を有するポルーサイト化合物の合成と熱膨張特性，　　　　　　　　　　　　　　　
  第22回関東支部研究発表会, 2006年
• ホウ酸架橋PVAからのB4C粉末の低温合成，　　　　　　　　　　　　　　　
  第22回関東支部研究発表会, 2006年
• マイクロ波照射下で調製した塩基性炭酸ニッケルの熱分解によるNiO微粒子の合成　　　　　　　　　　　　　　　
  日本セラミックス協会2006年年会講演予稿集，, 2006年
• 非晶質粉末を用いた低熱膨張性リューサイト多孔質体の作製　　　　　　　　　　　　　　　
  日本セラミックス協会第18回秋季シンポジウム講演予稿集，, 2005年
• Cs,Na)-リューサイト型化合物の熱膨張特性に及ぼすNa量の影響　　　　　　　　　　　　　　　
  日本セラミックス協会第18回秋季シンポジウム講演予稿集, 2005年
• Ca置換型ポルーサイト非晶質粉末を用いた低熱膨張性多孔質体の作製　　　　　　　　　　　　　　　
  第21回日本セラミックス協会関東支部研究発表会, 2005年
• 合成した(Cs,Na)-リューサイト型化合物の熱膨張特性　　　　　　　　　　　　　　　
  第21回日本セラミックス協会関東支部研究発表会, 2005年
• 使用済ダイヤモンド工具からのダイヤモンド粒子の回収　　　　　　　　　　　　　　　
  第21回日本セラミックス協会関東支部研究発表会, 2005年
• ポルーサイト型化合物の結晶構造と熱膨張特性　　　　　　　　　　　　　　　
  第43回セラミックス基礎科学討論会, 2005年
• 非晶質粉末を用いた低熱膨張性リューサイト多孔質体の作製　　　　　　　　　　　　　　　
  日本セラミックス協会第18回秋季シンポジウム講演予稿集，, 2005年
• Cs,Na)-リューサイト型化合物の熱膨張特性に及ぼすNa量の影響　　　　　　　　　　　　　　　
  日本セラミックス協会第18回秋季シンポジウム講演予稿集, 2005年
• Ca置換型ポルーサイト非晶質粉末を用いた低熱膨張性多孔質体の作製　　　　　　　　　　　　　　　
  第21回日本セラミックス協会関東支部研究発表会, 2005年
• 合成した(Cs,Na)-リューサイト型化合物の熱膨張特性　　　　　　　　　　　　　　　
  第21回日本セラミックス協会関東支部研究発表会, 2005年
• 使用済ダイヤモンド工具からのダイヤモンド粒子の回収　　　　　　　　　　　　　　　
  第21回日本セラミックス協会関東支部研究発表会, 2005年
• ポルーサイト型化合物の結晶構造と熱膨張特性　　　　　　　　　　　　　　　
  第43回セラミックス基礎科学討論会, 2005年
• Synthesis of nanocrystalline powders via carbonate co-precipitation and control of grain size in the sintered bodies using spark plasma sintering　　　　　　　　　　　　　　　
  International Symposium on Inorganic and Environmental Materials 2004, Netherland, 2004年
• Effect of PMMA on Porous Structure of Pollucite　　　　　　　　　　　　　　　
  International Symposium on Inorganic and Environmental Materials 2004, Netherland, 2004年
• 非晶質仮焼粉末を用いた低熱膨張性ポルーサイト焼結体の作製と微細構造　　　　　　　　　　　　　　　
  第42回セラミックス基礎討論会, 2004年
• イオン交換法によるCs-H型ポルーサイトの合成とその熱膨張挙動　　　　　　　　　　　　　　　
  第20回関東支部研究発表会, 2004年
• 立方晶Cs-リューサイト化合物の構造相転移に及ぼすNa置換効果　　　　　　　　　　　　　　　
  第20回関東支部研究発表会, 2004年
• Ca2+イオンを有する立方晶Cs-リューサイト化合物の合成と低熱膨張特性　　　　　　　　　　　　　　　
  第20回関東支部研究発表会, 2004年
• Synthesis of nanocrystalline powders via carbonate co-precipitation and control of grain size in the sintered bodies using spark plasma sintering　　　　　　　　　　　　　　　
  International Symposium on Inorganic and Environmental Materials 2004, Netherland, 2004年
• Effect of PMMA on Porous Structure of Pollucite　　　　　　　　　　　　　　　
  International Symposium on Inorganic and Environmental Materials 2004, Netherland, 2004年
• 非晶質仮焼粉末を用いた低熱膨張性ポルーサイト焼結体の作製と微細構造　　　　　　　　　　　　　　　
  第42回セラミックス基礎討論会, 2004年
• イオン交換法によるCs-H型ポルーサイトの合成とその熱膨張挙動　　　　　　　　　　　　　　　
  第20回関東支部研究発表会, 2004年
• 立方晶Cs-リューサイト化合物の構造相転移に及ぼすNa置換効果　　　　　　　　　　　　　　　
  第20回関東支部研究発表会, 2004年
• Ca2+イオンを有する立方晶Cs-リューサイト化合物の合成と低熱膨張特性　　　　　　　　　　　　　　　
  第20回関東支部研究発表会, 2004年

• -　　　　　　　　　　　　　　　
  ゼオライト関連化合物である種々の組成を有する立方晶系リューサイト化合物の合成手法を開発し、その低熱膨張化に関する研究を結晶学的な立場から行ってきた。現在は、超低熱膨張性化合物の創製及び低熱膨張性の立方晶リューサイト化合物を用いた材料開発を行っている。
  競争的資金
• -　　　　　　　　　　　　　　　
  競争的資金