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학술저널
저자정보
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대한금속·재료학회 Electronic Materials Letters Electronic Materials Letters Vol.7 No.1
발행연도
2011.1
수록면
39 - 43 (5page)

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Mn/Sn-doped CoSb_3 (Co_(4-x)Mn_xSb_(12-y)Sn_y) skutterudites were synthesized by mechanical alloying, and their thermoelectric properties were examined. A single d-phase was obtained successfully by post-annealing and hot pressing; however, MnSb phase was observed in Co_(2.5)Mn_(1.5)Sb_(12) and Co_3MnSb_(11.2)Sn_(0.8) 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 Co_3MnSb_(11.6)Sn_(0.4) 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 Co_3MnSb_(11.6)Sn_(0.4) specimen.

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