Thermoelectric properties of the brownmillerite oxide Ca2-yLayCo2-xAlxO5

Wataru Kobayashi, Akira Satake, Ichiro Terasaki*


    研究成果: Article査読

    14 被引用数 (Scopus)


    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.

    ジャーナルJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
    5 A
    出版ステータスPublished - 2002 5月

    ASJC Scopus subject areas

    • 物理学および天文学(その他)


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