Thermoelectric properties of the brownmillerite oxide Ca2-yLayCo2-xAlxO5

Wataru Kobayashi, Akira Satake, Ichiro Terasaki*

*この研究の対応する著者

    研究成果: Article査読

    12 被引用数 (Scopus)

    抄録

    We prepared the brownmillerite oxide Ca2-yLayCo2-xAlxO5 and found that it was an n-type conductor. The thermopower and the resistivity of the single crystal are respectively -90 μ V/K and 68 mΩcm along the ab direction at 440 K, which suggest relatively good thermoelectrical properties, compared with other transition-metal oxides. Their temperature dependences are of activation type, and the activation energies are 0.2 eV for the resistivity and 0.04 eV for the thermopower. These energies differ by one order in magnitude, which implies that a polaron dominates the charge transport. The sign of the thermopower of the polycrystals changes from negative to positive at 500 K, indicating that holes are excited thermally to decrease the magnitude of thermopower.

    本文言語English
    ページ(範囲)3025-3028
    ページ数4
    ジャーナルJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
    41
    5 A
    出版ステータスPublished - 2002 5

    ASJC Scopus subject areas

    • 物理学および天文学(その他)

    フィンガープリント

    「Thermoelectric properties of the brownmillerite oxide Ca<sub>2-y</sub>La<sub>y</sub>Co<sub>2-x</sub>Al<sub>x</sub>O<sub>5</sub>」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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