Filled skutterudite compounds, YyFexCo4-xSb12 (x = 0 to approximately 1.0, y = 0 to approximately 0.4), were synthesized by solid state reaction and melting methods using Co, Fe, Sb, YCl3·nH2O powders and Y ingot as source materials. The Rietveld analysis suggests that Y3+ ions were filled in the Sb-icosahedron voids of skutterudite structure. The rattling effect of Y3+ ions filling in the voids were stronger than that of Ce3+ or La3+ ions. The lattice thermal conductivity decreased with increasing Y filling fraction, and reached the minimum values at y = 0.3. With increasing Y filling fraction, the electrical conductivity decreased and the Seebeck coefficient increased. The maximum ZT value of 0.7 at 750 K was obtained for Y0.08Fe0.8Co3.2Sb12.
|ジャーナル||Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy|
|出版ステータス||Published - 2000 9|
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