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The average and local structure of the hollandite series AxRu4O8 (A+ = K, Rb, Rb1−xNax) has been investigated through neutron total scattering techniques. Analysis reveals a larger degree of structural disorder in the form of enlarged anisotropic atomic displacement parameters for samples where A+ = Rb, Rb1−xNax. This is evidenced in electrical measurements as a weakened temperature dependence of the resistivity in the RbxRu4O8 sample.
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 AxRu4O8 (A+ = K, Rb, Rb1–xNax) through neutron total scattering techniques. Samples with A+ = Rb, Rb1–xNax 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 KxRu4O8. 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.
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