Abstract
Mn/Sn-doped CoSb3 (Co4-xMnxSb12−ySny) skutterudites were synthesized by mechanical alloying, and their thermoelectric properties were examined. A single δ-phase was obtained successfully by post-annealing and hot pressing; however, MnSb phase was observed in Co2.5Mn1.5Sb12 and Co3MnSb11.2Sn0.8 specimens. Temperature dependence of the electrical conductivity suggests that the Mn/Sn-doped specimens are degenerate semiconductors. Every specimen had a positive Seebeck coefficient, and a Co3MnSb11.6Sn0.4 specimen exhibited the highest value. Mn doping caused a decrease in the Seebeck coefficient, but it could be enhanced by Mn/Sn double doping, possibly due to charge compensation. The thermal conductivity was desirably very low, and this originated from ionized impurity-phonon scattering. Thermoelectric properties were remarkably improved by Mn/Sn doping, and a maximum figure of merit, ZT = 0.54 was obtained at 723 K in the Co3MnSb11.6Sn0.4 specimen.
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