Influence of Structural Disorder on Hollandites AxRu4O8 (A+ = K, Rb, Rb1‿i>xNax)

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• 作者：Geneva Laurita ; Rosa Grajczyk ; Matthew Stolt ; Italo Coutinho ; Arthur W. Sleight ; M. A. Subramanian
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：April 4, 2016
• 年：2016
• 卷：55
• 期：7
• 页码：3462-3467
• 全文大小：444K
• ISSN：1520-510X

文摘

Structural disorder can play an important role in the electrical properties of correlated materials. In this work we examine the average and local disorder in hollandites A_xRu₄O₈ (A⁺ = K, Rb, Rb_1–xNa_x) through neutron total scattering techniques. Samples with A⁺ = Rb, Rb_1–xNa_x exhibit the largest amount of local disorder as evidenced by higher atomic displacement parameters, and as a result, a weakened temperature dependence of the resistivity is observed upon cooling as compared to K_xRu₄O₈. All samples exhibit anisotropic resistivity that is dominated by metallic conductivity at lower temperatures, and this is corroborated by Pauli paramagnetic behavior throughout the measured temperature regime.