Effect of Y (yttrium) filling fraction on thermoelectric properties ofp-type Y y Fe x Co4−x Sb12
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Yttrium-filled skutterudites YyFexCo4−xSb12 (y=0–0.40) were synthesized. The effect of Y filling fraction on thermoelectric properties of YyFexCo4−xSb12 was investigated. All samples showed p-type conduct. The electrical conductivity decreased with increasing filling fraction y. The Seebeck coefficient increased with increasing temperature. The lattice thermal conductivity decreased with increasing filling fraction y and showed the minimum value at a certain filling fraction y=0.3. The effect of different filling atoms M (M: Ba, Ce, Y) on the lattice thermal conductivity of MyFexCo4−xSb12 was discussed. The maximum ZT value of 0.7 was obtained for Y0.08Fe0.7Co3.3Sb12 at 750 K.
Key wordsfilled skutterudite compound filled fraction thermoelectric properties
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