Thermoelectric properties and phase transition of (ZnxCu2-x)V2O7

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  • Sotojima Kotaro
    Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University
  • Suzuki Ryosuke O.
    Department of Material Science, Graduate School of Engineering, Hokkaido University
  • Amezawa Koji
    Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University Graduate School of Human and Environmental Studies, Kyoto University
  • Tomii Yoichi
    Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University

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タイトル別名
  • Thermoelectric Properties and Phase Transition of (Zn<I><SUB>x</SUB></I>Cu<SUB>2−<I>x</I></SUB>)V<SUB>2</SUB>O<SUB>7</SUB>
  • Thermoelectric Properties and Phase Transition of (Zn<I><SUB>x</SUB></I>Cu<SUB>2&minus;<I>x</I></SUB>)V<SUB>2</SUB>O<SUB>7</SUB>

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The phase stability and thermoelectric properties of the layered structure of (ZnxCu2−x)V2O7 solid solutions were studied for x≥0.2. X-ray diffraction measurements, compositional studies, and thermal analysis verified that the low-temperature form of the (ZnxCu2−x)V2O7 solid solution (monoclinic structure, C2/c) was stable for 0.2≤x≤2 when heated below 863 K in air. On heating, phase transformation occurred at least at 0.2≤x≤2 at a nearly constant temperature of approximately 873 K; above this temperature, a high-temperature form of the (ZnxCu2−x)V2O7 solid solution was formed.<BR>The Seebeck coefficients of the low-temperature (ZnxCu2−x)V2O7 solid solution exhibited large negative values in the range of approximately −520 to −700 μV/K, and the electrical resistivity increased with Zn addition. The maximum power factor of 1.99×10−7 W/m K2 was obtained at 823 K for the low-temperature form of the (Zn0.2Cu1.8)V2O7 solid solution.

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