High-Pressure Synthesis, Structure, and Characterization of a Post-perovskite CaPtO3 with CaIrO3-Type Structure

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• 作者：Yoshiyuki Inaguma ; Ken-ichiro Hasumi ; Masashi Yoshida ; Tomonori Ohba ; Tetsuhiro Katsumata
• 刊名：Inorganic Chemistry
• 出版年：2008
• 出版时间：March 17, 2008
• 年：2008
• 卷：47
• 期：6
• 页码：1868 - 1870
• 全文大小：370K
• 年卷期：v.47,no.6(March 17, 2008)
• ISSN：1520-510X

文摘

A new ternary platinum oxide, CaPtO₃ was synthesized under a pressure of 7 GPa and a temperature of 1000 °C. The crystal structure of CaPtO₃ was determined by Rietveld analysis of the X-ray powder diffraction data. CaPtO₃ has a layered CaIrO₃-type structure (orthorhombic, space group: Cmcm), which is the same as that of a post-perovskite MgSiO₃ in the Earth’s lower mantle. The magnetic susceptibility data indicate that the Pt ion in CaPtO₃ is tetravalent in the low spin state with an electron configuration of t_2g⁶e_g⁰ (S = 0). This finding is consistent with the insulating behavior.