High-temperature thermoelectric properties of ln2O3-based mixed oxides and their applicability to thermoelectric power generation

Michitaka Ohtaki, Daisuke Ogura, Koichi Eguchi, Hiromichi Arai

    研究成果: ジャーナルへの寄稿学術誌査読

    83 被引用数 (Scopus)

    抄録

    The thermoelectric properties of mixed oxides ln2O3-MOx(MOx=Cr2O3, Mn2O3, NiO, ZnO, Y2O3, Nb2O5, SnO2) are investigated in terms of the thermoelectric materials at high temperature. The Seebeck coefficients, S, of all the samples have negative values, and those of ln2O3•SnO2 and ln2O3•ZnO increase linearly with temperature, attaining values of -90 and -210 μV K-1 at 1000 °C, respectively. The electrical conductivities, σ, of these oxides are significantly high. The power factor S2σ of the oxides has constantly positive temperature coefficients up to over 1000 °C. Rather low thermal conductivities, k, of the sintered bodies of the oxides, ca. 1.7 W m-1 K-1 at room temperature, lead to the largest value of the thermoelectric figure of merit Z=0.4 × 10-4 K-1 for M = Sn at 1000 °C, and the Z value increases toward higher temperatures.

    本文言語英語
    ページ(範囲)653-656
    ページ数4
    ジャーナルJournal of Materials Chemistry
    4
    5
    DOI
    出版ステータス出版済み - 1994

    !!!All Science Journal Classification (ASJC) codes

    • 化学 (全般)
    • 材料化学

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