Thermoelectric Properties of the Brownmillerite Oxide Ca_<2-y>La_yCo_<2-x>Al_xO_5
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概要
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We prepared the brownmillerite oxide Ca_<2-y>La_yCO_<2-x>Al_xO_5 and found that it was an n-type conductor. The thermopower and the resistivity of the single crystal are respectively -90 μV/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.
- 社団法人応用物理学会の論文
- 2002-05-15
著者
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Kobayashi Wataru
Department of Biology,Faculty of Science, Hokkaido University
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TERASAKI Ichiro
Department of Applied Physics, Waseda University
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Terasaki Ichiro
Department Of Applied Physics. Waseda University:precursory Research For Embryonic Science And Techn
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Terasaki Ichiro
Department Of Applied Physics The University Of Tokyo
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SATAKE Akira
Department of Organ Reconstruction, Field of Clinical Application, Institute for Frontier Medical Sc
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Satake Akira
Department Of Applied Physics. Waseda University
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Kobayashi Wataru
Department Of Applied Physics. Waseda University
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Kobayashi Wataru
Department Of Applied Physics Waseda University
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