We previously reported that IrSb 3 -based ternary compounds showed good electrical properties and that relatively high thermal conductivity prevented the enhancement of the efficiency of these compounds. 1 Recently, we have investigated the high-temperature thermoelectric properties of La-filled IrSb 3 -based skutterudite compounds from the viewpoint of a decrease in lattice thermal conductivity. It has been confirmed from Rietveld analysis that the La ions are partially placed in cages of La-filled and Ge-charge-compensated La Y Ir 4 Ge 3Y Sb 12-3Y compounds and 53% filling of La ions is obtained. Owing to the rattling effect of La ions in cages, the La-filled and Ge-charge-compensated La Y Ir 4 Ge 3Y Sb 12-3Y compounds exhibit tremendously decreased lattice thermal conductivity at room temperature, 1.8 W/mK from 10.2 W/mK of binary IrSb 3 .
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