High performance composite thermoelectric material with dispersed amorphous phase

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The relationship between the microscopic structure and thermoelectric properties of half-Heusler ZrNiSn intermetallic compound was investigated. ZrNiSn_<0.98>Sb_<0.02>, which was partially substituted by Sb for Sn in ZrNiSn, was mechanically milled. The crystal grain size of the sintered body prepared from the milled powder decreased with an increase of the milling time, and the sample with a longer milling time showed a smaller thermal conductivity resulting in higher figure of merit. The reduction of the thermal conductivity was also observed in the composite sample with ZrNiSn crystal grain and ZrNi amorphous grain, and a slight increase of the figure of merit was observed. It became clear that there was a possibility of the enhancement of the figure of merit in the sample with dispersed amorphous phase.