Crystal Structure and Thermoelectric Properties of β-Pyrochlore-Type Alkali Iron Tungsten Oxides with Cage-Like Structure

Kohei Mizuta, Michitaka Ohtaki

    研究成果: ジャーナルへの寄稿記事

    1 引用 (Scopus)

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    We report the electrical and thermal properties of β-pyrochlore (defect pyrochlore) oxides AFe0.33W1.67O6 (A = K, Rb, Cs) with a crystal structure having a small cation surrounded by oversized cage-like framework. The thermal conductivity, κ, of CsFe0.33W1.67O6 and RbFe0.33W1.67O6 showed extremely low values as oxides (below 1.0 W/mK) similar to those of ATaWO6 (A = K, Rb, Cs) which we have already reported. These low κ values are ascribed to a “rattling” motion of the A cations, evidenced by their crystal structure refinement and the Raman spectra. Their electrical conductivity, σ, was in the order of 10−3 S/cm, and the Seebeck coefficient, S, was −500 to −600 μV/K. The electrical conductivity of AFe0.33W1.67O6 (A = Rb, Cs) was much higher than those of ATaWO6 (A = Rb, Cs), suggesting that an appropriate selection of the framework composition enables us to have better thermoelectric performance.

    元の言語英語
    ページ(範囲)1695-1699
    ページ数5
    ジャーナルJournal of Electronic Materials
    45
    発行部数3
    DOI
    出版物ステータス出版済み - 3 1 2016

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    tungsten oxides
    Alkalies
    iron oxides
    Oxides
    Tungsten
    Cations
    alkalies
    Iron
    Crystal structure
    Positive ions
    cations
    electrical resistivity
    crystal structure
    Seebeck coefficient
    oxides
    Seebeck effect
    Raman scattering
    Thermal conductivity
    Electric properties
    thermal conductivity

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Electrical and Electronic Engineering
    • Materials Chemistry

    これを引用

    Crystal Structure and Thermoelectric Properties of β-Pyrochlore-Type Alkali Iron Tungsten Oxides with Cage-Like Structure. / Mizuta, Kohei; Ohtaki, Michitaka.

    :: Journal of Electronic Materials, 巻 45, 番号 3, 01.03.2016, p. 1695-1699.

    研究成果: ジャーナルへの寄稿記事

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    abstract = "We report the electrical and thermal properties of β-pyrochlore (defect pyrochlore) oxides AFe0.33W1.67O6 (A = K, Rb, Cs) with a crystal structure having a small cation surrounded by oversized cage-like framework. The thermal conductivity, κ, of CsFe0.33W1.67O6 and RbFe0.33W1.67O6 showed extremely low values as oxides (below 1.0 W/mK) similar to those of ATaWO6 (A = K, Rb, Cs) which we have already reported. These low κ values are ascribed to a “rattling” motion of the A cations, evidenced by their crystal structure refinement and the Raman spectra. Their electrical conductivity, σ, was in the order of 10−3 S/cm, and the Seebeck coefficient, S, was −500 to −600 μV/K. The electrical conductivity of AFe0.33W1.67O6 (A = Rb, Cs) was much higher than those of ATaWO6 (A = Rb, Cs), suggesting that an appropriate selection of the framework composition enables us to have better thermoelectric performance.",
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