Synthesis and thermoelectric properties of p-type- and n-type-filled skutterudite RyMxCo4−xSb12(R:Ce,Ba,Y;M:Fe,Ni)

Single-phase RyMxCo4−xSb12(x=0–3.0,y=0–0.7) compounds filled by Ce, Ba, and Y, and substituted by Fe and Ni are synthesized by using the solid-state reaction method and melting reaction method. The structure and the thermoelectric properties of RyMxCo4−xSb12 are investigated systematically. The thermal parameter (B) of Ba and Ce filled in Sb-icosahedron voids in the skutterudite structure is larger than that of Sb and Co (Fe). The maximum filling fraction of Ce and Ba (ymax) for RyFexCo4−xSb12 increases with the increasing Fe content, and it is found that the maximum filling fraction of Ba (ymax) is greater than that of CeyFexCo4−xSb12. The filling atoms Ba, Ce, and Y in Sb-icosahedron voids can reduce the lattice thermal conductivity of RyMxCo4−xSb12 compounds remarkably, and the lattice thermal conductivity decreases in the order of ionic radii decreasing of Ba2+, Ce3+, and Y3+. When Ce and Ba filing fraction is 0.3–0.4, the lattice thermal conductivity of RyFexCo4−xSb12 compounds reaches a minimum valu...

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