Oxyhydrides of (Ca,Sr,Ba)TiO3 Perovskite Solid Solutions

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• 作者：Tatsunori Sakaguchi ; Yoji Kobayashi ; Takeshi Yajima ; Masatoshi Ohkura ; C茅dric Tassel ; Fumitaka Takeiri ; Shingo Mitsuoka ; Hiroshi Ohkubo ; Takafumi Yamamoto ; Jung eun Kim ; Naruki Tsuji ; Akihiko Fujihara ; Yoshitaka Matsushita ; James Hester ; Maxim Avdeev ; Kenji Ohoyama ; Hiroshi Kageyama
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：November 5, 2012
• 年：2012
• 卷：51
• 期：21
• 页码：11371-11376
• 全文大小：377K
• 年卷期：v.51,no.21(November 5, 2012)
• ISSN：1520-510X

文摘

The oxyhydride solid solutions (Ca,Sr)TiO_3鈥?i>xH_x and (Sr,Ba)TiO_3鈥?i>xH_x have been prepared by reducing the corresponding ATiO₃ oxides with calcium hydride. Under the reaction conditions examined, a hydride content of x = 0.1鈥?.3 was obtained for all compositions. Compared to our previous result with BaTiO_3鈥?i>xH_x, the larger particle size in this study (20鈥?0 渭m vs 170 nm) resulted in a somewhat lower hydride amount despite prolonged reaction times. We examined changes in cell volume, octahedral tilt angle, and site occupancy of different anion sites after conversion to oxyhydrides; it appears that these oxyhydrides fit the geometrical descriptions typical for regular ABO₃ perovskites quite well. The hydrogen release temperature, previously shown to be indicative of the hydride exchange temperature, however, does not scale linearly with the A-site composition, indicating a potential effect of chemical randomness.