Rare earth compounds with a cage-like structure have been actively studied as potentially useful thermoelectric material because the compounds are believed to have low lattice conductivity due to a local anharmonic vibration of guest ions inside the cage. We have synthesized new skutterudite compounds, which are typical materials with a cage?like structure, and investigate their crystallographic, transport, thermoelectric properties in order to elucidate the mechanism of thermal conductivity reduction by local anharmonic phonons (rattling effect). We report some experimental evidences about rattling motion in skutterudite compounds and discuss the mechanism.
カゴ状希土類化合物におけるラットリング効果による熱伝導率低減機構の解明
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