Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Thermoelectric Properties of the 0.05wt% $SbI_3$-Doped n-Type $Bi_2({Te_{0.95}}{Se_{0.05}})_3$ Alloy with Variation of the Annealing Time

0.05wt% $SbI_3$를 첨가한 n형 $Bi_2({Te_{0.95}}{Se_{0.05}})_3$ 가압소결체의 열처리 시간에 따른 열전특성

  • Lee, Sun-Kyong (Department of Metallurgical Engineering and Materials Science, Hong Ik University) ;
  • Oh, Tae-Sung (Dept. of Metallurgical Engineering and Materials Science, Hong Ik University) ;
  • Hyun, Dow-Bin (Metals Processing Research Center, Korea Institute of Science and Technology)
  • 이선경 (홍익대학교 공과대학 금속.재료공학과) ;
  • 오태성 (홍익대학교 공과대학 금속.재료공학과) ;
  • 현도빈 (한국과학기술연구원 금속공정연구센타)
  • Published : 2000.04.01
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Abstract

Thermoelectric properties of the 0.05wt% $SbI_3$-doped n-type $Bi_2(Te_{0.95}Se_{0.05})_3$ alloy, prepared by melting/grinding and hot pressing, were investigated with variation of the annealing time up to 36 hours. The electron concentration of the 0.05wt% SbI$_3$-doped n-type $Bi_2(Te_{0.95}Se_{0.05})_3$ alloy decreased with increasing the annealing time. The figure-of-merit of the 0.05wt% $SbI_3$-doped n-type $Bi_2(Te_{0.95}Se_{0.05})_3$ alloy was improved from $2.1{\times}10^{-3}/K$ to $2.35{\times}10^{-3}/K$ by annealing at $500^{\circ}C$ for 3 hours. When annealed longer than 12 hours, however, the figure-of-merit decreased substantially due to the increase of the electrical resistivity.

0.05wt% $SbI_3$를 첨가한 n형 $ Bi_2(Te(_{0.95}Se_{0.05})_3$ 합금분말을 용해/분쇄법으로 제조하여 가압소결 후, 36시간까지의 열처리 시간에 따른 열전특성의 변화 거동을 분석하였다. 열처리 시간이 증가함에 따라 0.05wt% $SbI_3$를 첨가한 n형 $ Bi_2(Te(_{0.95}Se_{0.05})_3$ 가압소결체의 전자 농도가 감소하였다. 0.05wt% $SbI_3$를 첨가한 $Bi_2(Te(_{0.95}Se_{0.05})_3$ 가압소결체는 $2.1{\times}10^{-3}/K$의 성능지수를 나타내었으며 $500^{\circ}C$에서 3시간 열처리 시 $2.35{\times}10^{-3}/K$로 성능지수가 향상되었으나, 12시간 이상 열처리 시에는 전기비저항의 증가에 기인하여 성능지수의 현저한 감소가 발생하였다.

Keywords

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