Synthesis, Crystal Structure, and Electronic Properties of High-Pressure PdF2-Type Oxides MO2 (M = Ru, Rh, Os, Ir, Pt)

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• 作者：Yuichi Shirako ; Xia Wang ; Yoshihiro Tsujimoto ; Kie Tanaka ; Yanfeng Guo ; Yoshitaka Matsushita ; Yoshihiro Nemoto ; Yoshio Katsuya ; Youguo Shi ; Daisuke Mori ; Hiroshi Kojitani ; Kazunari Yamaura ; Yoshiyuki Inaguma ; Masaki Akaogi
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：November 3, 2014
• 年：2014
• 卷：53
• 期：21
• 页码：11616-11625
• 全文大小：696K
• ISSN：1520-510X

文摘

The polycrystalline MO₂鈥檚 (HP-PdF₂-type MO₂, M = Rh, Os, Pt) with high-pressure PdF₂ compounds were successfully synthesized under high-pressure conditions for the first time, to the best of our knowledge. The crystal structures and electromagnetic properties were studied. Previously unreported electronic properties of the polycrystalline HP-PdF₂-type RuO₂ and IrO₂ were also studied. The refined structures clearly indicated that all compounds crystallized into the HP-PdF₂-type structure, M⁴⁺O^{2鈥?/sup>₂, rather than the pyrite-type structure, Mn+(O₂)n鈭?/sup> (n < 4). The MO₂ compounds (M = Ru, Rh, Os, Ir) exhibited metallic conduction, while PtO₂ was highly insulating, probably because of the fully occupied t_2g band. Neither superconductivity nor a magnetic transition was detected down to a temperature of 2 K, unlike the case of 3d transition metal chalcogenide pyrites.}