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• W2044019663 abstract "The synthesis and physical properties of the K1–xIr4O8 (0 ≤ x ≤ 0.7) solid solution are reported. The structure of KIr4O8, solved with single-crystal X-ray diffraction at T = 110 K, is found to be tetragonal, space group I4/m, with a = 10.0492(3) Å and c = 3.14959(13) Å. A highly anisotropic displacement parameter is found for the potassium cation. Density functional theory calculations suggest that this anisotropy is due to a competition between atomic size and bond valence. KIr4O8 has a significant electronic contribution to the specific heat, γ = 13.9 mJ mol-Ir–1 K–2, indicating an effective carrier mass of m*/me ≈ 10. Further, there is a magnetic-field-dependent upturn in the specific heat at T < 3 K, suggestive of a magnetically sensitive phase transition below T < 1.8 K. Resistivity and magnetization measurements show that both end-members of the solid solution, KIr4O8 and K1–xIr4O8 (x ≈ 0.7), are metallic, with no significant trends in the temperature-independent contributions to the magnetization. These results are interpreted and discussed in the context of the importance of the variability of the oxidation state of iridium. The differences in physical properties between members of the K1–xIr4O8 (0 ≤ x ≤ 0.7) series are small and appear to be insensitive to the iridium oxidation state." @default.
• W2044019663 created "2016-06-24" @default.
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• W2044019663 date "2014-04-16" @default.
• W2044019663 modified "2023-10-16" @default.
• W2044019663 title "Control of the Iridium Oxidation State in the Hollandite Iridate Solid Solution K_1–<i>x</i>Ir₄O₈" @default.
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• W2044019663 doi "https://doi.org/10.1021/ic5001667" @default.
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