Extremely low thermal conductivity in oxides with cage-like crystal structure

Michitaka Ohtaki, So Miyaishi

    研究成果: ジャーナルへの寄稿記事

    8 引用 (Scopus)

    抄録

    Although successful examples of thermoelectric materials with the "rattler-in-a-cage" structure include filled skutterudites and clathrate compounds, there has been no report on "rattling" oxides. Here we report the thermal properties of defect pyrochlore (β-pyrochlore) oxides with smaller cations in an oversized cage-like crystal structure. It is clearly shown that the thermal diffusivity, α and the thermal conductivity, κ, are lower for the oxides containing lighter A-site cations, contradicting the conventional prediction of the phonon thermal conductivity, in which lighter comprising atoms must give higher α and hence κ. These results strongly suggest that the smaller A-site cations with larger size mismatch to the surrounding cage structure enhance the phonon scattering and thereby reduce α and κ. These findings directly evidence the "rattling" effect of the loosely bound cations on the thermal transport properties of oxide materials.

    元の言語英語
    ページ(範囲)1299-1302
    ページ数4
    ジャーナルJournal of Electronic Materials
    42
    発行部数7
    DOI
    出版物ステータス出版済み - 7 1 2013

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    Oxides
    Cations
    Thermal conductivity
    thermal conductivity
    Crystal structure
    Positive ions
    cations
    crystal structure
    oxides
    Skutterudites
    Phonon scattering
    thermoelectric materials
    Thermal diffusivity
    clathrates
    thermal diffusivity
    Transport properties
    Thermodynamic properties
    thermodynamic properties
    transport properties
    Atoms

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Electrical and Electronic Engineering
    • Materials Chemistry

    これを引用

    Extremely low thermal conductivity in oxides with cage-like crystal structure. / Ohtaki, Michitaka; Miyaishi, So.

    :: Journal of Electronic Materials, 巻 42, 番号 7, 01.07.2013, p. 1299-1302.

    研究成果: ジャーナルへの寄稿記事

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