Korean Journal of Crystallography (한국결정학회지)

Korean Crystallographic Association (한국결정학회)
권호 표지

Mechanical alloy and Thermoelectric Properties of $\beta-FeSi_2$ by Planetary Ball Milling

기계적 합금법에 의한 $\beta-FeSi_2$분말 합성 및 열전특성

  • Park Keunil (Department of Chemical Eng., Univ. of Seoul) ;
  • Cho Sung Il (Department of Chemical Eng., Univ. of Seoul)
  • 박권일 (서울시립대학교 화학공학과) ;
  • 조성일 (서울시립대학교 화학공학과)
  • Published : 2004.12.01
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Abstract

The mechanical synthesis of thermoelectric material $FeSi_2$ by planetary ball mill has been investigated. The homogeneous and amorphous mixture of Fe-Si has been obtained by mechanical alloying for 850 rpm-40 min. The $\beta-FeSi_2$ powder could be synthesized by 1123 K-3 hr annealing heat treatment after mechanical alloying for 850 rpm-10, 20, and 40 min. The ceramic samples doped with the maximum content up to $10\;at.\;\%$ Co have exhibited semiconduction phenomena and maximum thermoelectric powder at 440K.

유성형 볼밀을 이용하여 기계적으로 $\beta-FeSi_2$, 분말 합금을 합성하였다. 850rpm-40분 기계적 합금합성 결과 비정질, 균일한 합금분말을 얻을 수 있었으며 1123 K-3 hr분말 소결한 결과 10분, 20분, 40분 기계적 합금분말 모두 $\beta-FeSi_2$,를 전이됨을 알 수 있었다 Co를 n형 도펀트로 1423k에서 2 시간 소결 후 1123 K에서 25시간 열처리한 시편의 전기 전도도와 기전력을 측정한 결과 과잉 도핑된 $10\;at\;\%$ Co 시편도 반도체 현상을 나타내었으며 약 440k에서 최대 기전력을 나타내었다.

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References

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