Structural and semiconductor-to-metal transitions of double-perovskite cobalt oxide Sr 2-xLa xCoTiO 6-δ with enhanced thermoelectric capability

Tohru Sugahara, Michitaka Ohtaki

    研究成果: ジャーナルへの寄稿記事

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    抄録

    The thermoelectric properties of double-perovskite oxide Sr 2-xLa xCoTiO 6-δ were revealed to vary anomalously with the La concentration, plausibly due to a structural transition found in this study. Although the temperature dependence of the resistivity and thermopower of the present oxide showed a semiconductor-to-metal transition similar to those observed for other perovskite-related Co oxides such as Sr 1-xY xCoO 3-δ, the transition temperature was more than 350 K higher, implying considerable stabilization of the low-spin state of Co ions in the double-perovskite oxide. Consequently, the operating temperature range of the oxide for potential thermoelectric applications was significantly expanded toward higher temperatures.

    元の言語英語
    記事番号062107
    ジャーナルApplied Physics Letters
    99
    発行部数6
    DOI
    出版物ステータス出版済み - 8 8 2011

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    cobalt oxides
    transition metals
    oxides
    operating temperature
    stabilization
    transition temperature
    temperature dependence
    electrical resistivity
    ions

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy (miscellaneous)

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    abstract = "The thermoelectric properties of double-perovskite oxide Sr 2-xLa xCoTiO 6-δ were revealed to vary anomalously with the La concentration, plausibly due to a structural transition found in this study. Although the temperature dependence of the resistivity and thermopower of the present oxide showed a semiconductor-to-metal transition similar to those observed for other perovskite-related Co oxides such as Sr 1-xY xCoO 3-δ, the transition temperature was more than 350 K higher, implying considerable stabilization of the low-spin state of Co ions in the double-perovskite oxide. Consequently, the operating temperature range of the oxide for potential thermoelectric applications was significantly expanded toward higher temperatures.",
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    T1 - Structural and semiconductor-to-metal transitions of double-perovskite cobalt oxide Sr 2-xLa xCoTiO 6-δ with enhanced thermoelectric capability

    AU - Sugahara, Tohru

    AU - Ohtaki, Michitaka

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    N2 - The thermoelectric properties of double-perovskite oxide Sr 2-xLa xCoTiO 6-δ were revealed to vary anomalously with the La concentration, plausibly due to a structural transition found in this study. Although the temperature dependence of the resistivity and thermopower of the present oxide showed a semiconductor-to-metal transition similar to those observed for other perovskite-related Co oxides such as Sr 1-xY xCoO 3-δ, the transition temperature was more than 350 K higher, implying considerable stabilization of the low-spin state of Co ions in the double-perovskite oxide. Consequently, the operating temperature range of the oxide for potential thermoelectric applications was significantly expanded toward higher temperatures.

    AB - The thermoelectric properties of double-perovskite oxide Sr 2-xLa xCoTiO 6-δ were revealed to vary anomalously with the La concentration, plausibly due to a structural transition found in this study. Although the temperature dependence of the resistivity and thermopower of the present oxide showed a semiconductor-to-metal transition similar to those observed for other perovskite-related Co oxides such as Sr 1-xY xCoO 3-δ, the transition temperature was more than 350 K higher, implying considerable stabilization of the low-spin state of Co ions in the double-perovskite oxide. Consequently, the operating temperature range of the oxide for potential thermoelectric applications was significantly expanded toward higher temperatures.

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