Low-Temperature Vacuum Reduction of BiMnO3

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• 作者：Alexei A. Belik ; Yoshitaka Matsushita ; Masahiko Tanaka ; Eiji Takayama-Muromachi
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：August 15, 2011
• 年：2011
• 卷：50
• 期：16
• 页码：7685-7689
• 全文大小：794K
• 年卷期：v.50,no.16(August 15, 2011)
• ISSN：1520-510X

文摘

Low-temperature vacuum reduction was used for the preparation of the oxygen-deficient BiMnO_2.81 sample in a bulk form from stoichiometric BiMnO₃. The transformation occurs in vacuum better than 10^鈥? Pa at a narrow temperature range of 570鈥?00 K. The structure of the new phase was analyzed using synchrotron X-ray powder diffraction data. BiMnO_2.81 crystallizes in a perovskite-type cubic structure (space group I鈥?3d) with a = 15.88552(5) 脜 corresponding to a 4a_p superstructure, where a_p is the parameter of the cubic perovskite subcell. Oxygen vacancies are ordered, and one oxygen site in BiMnO_2.81 is completely vacant, resulting in MnO₅ pyramids. BiMnO_2.81 is rather unstable in air and slowly restores its oxygen content even at room temperature.