Abstract

Mg와 Sb 분말을 사용하여 1173 K에서 결정성이 좋은 단일상의 <TEX>$Mg_3Sb_2$</TEX> 합금을 제조하였다. 이 합금의 열전성능지수 zT는 온도상승에 따라 크게 증가하였고 593 K에서 <TEX>$2.39{\times}10^{-2}$</TEX>의 값을 나타내었다. 얻어진 <TEX>$Mg_3Sb_2$</TEX> 합금을 planetary ball mill에서 12~48시간 볼밀링할 경우 주 결정상 <TEX>$Mg_3Sb_2$</TEX>는 유지가 되었으나 결정성이 나빠졌고 금속원소 Sb상이 나타났다. Mg와 Sb를 섞고 24시간 볼밀링에 의한 합금화 방법으로 합성할 경우 원소금속 Sb가 나타나지 않은 <TEX>$Mg_3Sb_2$</TEX> 결정상을 얻을 수 있었다. A single phase <TEX>$Mg_3Sb_2$</TEX> alloy was synthesized by melting the mixture of Mg and Sb metal powders at 1173 K. The figure of merit of the <TEX>$Mg_3Sb_2$</TEX> prepared by melting method increased with temperature and showed a value of <TEX>$2.39{\times}10^{-2}$</TEX> at 593 K. When the <TEX>$Mg_3Sb_2$</TEX> powders were milled at high speed in a planetary ball mill for 12~48 h, Zintle phase (<TEX>$Mg_3Sb_2$</TEX>) was maintained as a main phase, but its crystallinity became deteriorated and elemental Sb phase appeared. Sb phase free <TEX>$Mg_3Sb_2$</TEX> could be obtained by the mechanical alloying of high speed ball milling for 24 h using elemental Mg and Sb powder mixtures.

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