• extremely low thermal conductivity in oxides with cage-like crystal structure

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 741
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    • شماره تماس دبیرخانه رویداد: -
     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 reduceα and κ. these findings directly evidence the “rattling” effect of the loosely bound cations on the thermal transport properties of oxide materials.

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