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駒淵 舞*; 漆原 大典*; 浅香 透*; 福田 功一郎*; 大原 高志; 宗像 孝司*; 石川 喜久*
Journal of the Physical Society of Japan, 89(3), p.034601_1 - 034601_5, 2020/03
被引用回数:2 パーセンタイル:21.38(Physics, Multidisciplinary)The crystal structure of an X-type hexaferrite SrCoFeO was investigated by the X-ray and neutron diffraction methods for a single crystal. SrCoFeO has the crystal structure described as a space group () and its lattice constants are = 5.9165(2) ; and = 84.1395(33) ; at 843 K. Co ions are almost localized in the octahedral site () in the middle of SS blocks. In addition, the adjacent octahedral and tetrahedral sites to site contain the significant number of Co.
藤井 孝太郎*; 八島 正知*; 日比野 圭祐*; 白岩 大裕*; 福田 功一郎*; 中山 享*; 石沢 伸夫*; 花島 隆泰*; 大原 高志
Journal of Materials Chemistry A, 6(23), p.10835 - 10846, 2018/06
被引用回数:27 パーセンタイル:69.42(Chemistry, Physical)Apatite-type rare earth silicates are attractive materials with exhaust application such as solid-oxide fuel cells, due to its extremely high oxide-ion conductivity below 600C. Interstitial (excess) oxygens have been believed to be responsible for the high conductivity in apatite-type materials. On the contrary, the present study clearly reveals the presence of Si vacancies [] in La-rich La(Si[]])O instead of the interstitial oxygens, by single-crystal neutron and X-ray diffraction analyses, density measurements and electronic calculations.