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Screening and Fabrication of Half-Heusler Phases for Thermoelectric Applications

Published online by Cambridge University Press:  01 February 2011

Wilfried Wunderlich  and
Yuichiro Motoyama
Wilfried Wunderlich
Affiliation:
wunderli@keyaki.cc.u-tokai.ac.jp, Tokai University, Fac. Eng.,, Mat. Sci.Dept.,, Hiratsuka-shi, Kanagawa-ken, Japan
Yuichiro Motoyama
Affiliation:
8AAZM023@mail.tokai-u.jp, Tokai University, Fac. Eng.,, Mat. Sci.Dept.,, Hiratsuka-shi, Kanagawa-ken, Japan
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Abstract

Half-Heusler phases have gained recently much interest as thermoelectric materials. Screening of possible systems was performed by drawing their stability region in a three-dimensional Pettifor map. The fabrication of Half-Heusler phases requires three steps, surface activation of the raw material by ball milling, arc-melting of pressed pellets and finally long-term annealing treatment in a vacuum furnace. On doped TiCoSb specimens, Seebeck coefficients of 0.1 mV/K, on NiNbSn 0.16 mV/K were measured, although the microstructure was not yet optimized.

Keywords

thermoelectricpowder metallurgycrystallographic structure

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