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

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    18 Citations (Scopus)

    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.

    Original languageEnglish
    Article number062107
    JournalApplied Physics Letters
    Volume99
    Issue number6
    DOIs
    Publication statusPublished - Aug 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)

    Cite this

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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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