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Synthesis and Thermoelectric Properties of Co4-XFeXSb12-YSnY Skutterudites

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Abstract:

Co4-xFexSb12-ySny skutterudites were synthesized by mechanical alloying and hot pressing, and thermoelectric properties were examined. The carrier concentration increased by doping and thereby the electrical conductivity increased compared with intrinsic CoSb3. Every specimen had a positive Seebeck coefficient. Fe doping caused a decrease in the Seebeck coefficient but it could be enhanced by Fe/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 improved remarkably by Fe/Sn doping, and a maximum figure of merit, ZT = 0.5 was obtained at 723 K in the Co3FeSb11.2Sn0.8 specimen.

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Periodical:

Materials Science Forum (Volume 695)

Pages:

65-68

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.695.65

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Online since:

July 2011

Authors:

Kwan Ho Park, Il Ho Kim

Keywords:

Double Doping, Hot-Pressing, Mechanical Alloying (MA), Skutterudite, Thermoelectric

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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