Structural and Physical Properties of the 6M BaIrO3: A New Metallic Iridate Synthesized under High Pressure

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• 作者：Jinggeng Zhao ; Liuxiang Yang ; Yong Yu ; Fengying Li ; Richeng Yu ; Changqing Jin
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：May 18, 2009
• 年：2009
• 卷：48
• 期：10
• 页码：4290-4294
• 全文大小：256K
• 年卷期：v.48,no.10(May 18, 2009)
• ISSN：1520-510X

文摘

The 6M BaIrO₃ with the distorted hexagonal BaTiO₃ structure was synthesized by high-pressure sintering. Through Rietveld refinement of the powder X-ray diffraction data, the lattice parameters of a = 5.7459(1) Å, b = 9.9289(2) Å, c = 14.3433(2) Å, and β = 91.340(1)° were obtained. In the Ir₂O₉ dioctahedron, the average Ir−O distance and direct Ir−Ir distance were equal to 2.067(19) and 2.719(1) Å, respectively. The temperature dependence of electrical resistivity shows that the 6M BaIrO₃ is a new metallic iridate. It is an abnormal metal, being deviated from the Fermi liquid behavior, following a linear relationship of ρ versus T below 20 K. Both magnetic susceptibility and specific heat data indicate that it is an exchange-enhanced Pauli paramagnet, because of the electron−electron correlation effect.