Sr2OsO5 and Sr7Os4O19, Two Structurally Related, Mott Insulating Osmates(VI) Exhibiting Substantially Reduced Spin Paramagnetic Response

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• 作者：Shrikant A. Mohitkar ; Walter Schnelle ; Claudia Felser ; Martin Jansen
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：August 15, 2016
• 年：2016
• 卷：55
• 期：16
• 页码：8201-8206
• 全文大小：424K
• 年卷期：0
• ISSN：1520-510X

文摘

The new osmates(VI), Sr₂OsO₅ and Sr₇Os₄O₁₉, feature quasi-1-D polyoxo anions, consisting of corner sharing [OsO₆] octahedra. In both compounds, the magnetic moment at T = 300 K is significantly lower (1.2–1.3 μ_B/Os-atom) than the value expected for S = 1. For neither of the new osmates(VI) is any evidence for long-range magnetic order found. For Sr₇Os₄O₁₉, magnetic susceptibility suggests an antiferromagnetic ordering at T_N = 43(3) K; however, no corresponding anomaly is visible in specific heat. Both compounds are semiconductors.