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Vol.35, No.1, 153 ~ 162, 1997
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| Title |
| Research Paper - Electronic . Magnetic & Optical Materials : Thermoelectric Properties of p - Type ( Bi0.25 Sb0.75)2 Te3 Fabricated by Mechanical Alloying Process |
| 정부양 , 오태성 , 남등의 , 현도빈 , 심재동 B . Y . Jung , T . S . Oh , S . E . Nam , D . B . Hyun , J . D . Shim |
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| Abstract |
| Formation of (Bi_(0. 25)Sb_(0. 75))₂Te₃ alloy was completed by mechanical alloying of the as-mixed Bi, Sb, and Te granules of ∼5 ㎜ size for 5 hours at ball-to-material ration of 5:1. When hot pressed at temperatures ranged from 300℃ to 550℃ for 30 minutes, figure of merit of (Bi_(0. 25)Sb_(0. 75))₂Te₃ increased with increasing hot pressing temperature and maximum value of 2.8×10^(-3)/K could be obtained by hot pressing at 550℃. When hot pressed at 400℃, figure of merit was increased from 2.0×10^(-3)/K to 2.37×10^(-3)/K with addition of 1.25 wt% Sb as an acceptor dopant. With further addition of Sb, however, figure of merit was abruptly decreased. When hot pressed at 550℃, figure of merit(∼2.8×10^(-3)/K) was little changed with addition of Sb up to 2 wt%, and then decreased abruptly below 0.5×10^(-3)/K with further addition of Sb. |
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