Abstract
Polycrystalline samples of Sm partially filled skutterudites Sm y Fe x Co 4 - x Sb 12 were prepared by melting and Spark Plasma Sintering technique. The results of Rietveld refinement showed that the obtained Sm y Fe x Co 4 - x Sb 12 samples possessed filled skutterudite structures. The thermal parameter ( B) of Sm is larger than that of Sb, Fe, and Co, indicating that Sm “rattled” in Sb-icosahedron voids. The effects of filling atom Sm on thermoelectric properties of these compounds were investigated. With the increase of Sm filling fraction ( y), electrical conductivity decreased, Seebeck coefficient increased and had a maximum value when y was 0.38; thermal conductivity reduced and had a minimum value when y was 0. 32. At 750 K, the highest figure of merit of 0.68 was obtained for Sm 0.32Fe 1.47Co 2.53Sb 12.
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