n형 Bi2(Te,Se)3 가압소결체의 열전특성
Thermoelectric Properties of the n-type Bi2(Te,Se)3 Processed by Hot Pressing
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초록
n형 Bi2(Te,Se)3 분말을 용해/분쇄법으로 제조하여 가압소결 후, 가압소결체의 열전특성을 Bi2(Te,Se)3 잉곳과 비교하였으며, Bi2(Te,Se)3 열전분말의 기계적 밀링처리가 가압소결체의 열전특성에 미치는 영향을 분석하였다. Bi2(Te,Se)3 잉곳은 24.2×10-4W/m-K2의 power factor를 나타내었으며, 이를 가압소결함으로써 power factor가 27.3~32.3×10-4 W/m-K2로향상되었다. 기계적 밀링처리한 분말로 제조한 Bi2(Te,Se)3 가압소결체는 100oC에서 1.02의 무차원 성능지수를 나타내었으며, 130oC에서 외인성-내인성 천이거동을 나타내었다.
Abstract
The n-type Bi2(Te,Se)3 powders were fabricated by melting/grinding method and were hot-pressed in order to compare thermoelectric properties of the hot-pressed specimens with those of the Bi2(Te,Se)3 ingot. Effects of mechanical milling treatment of the Bi2(Te,Se)3 powders on thermoelectric characteristics of a hot-pressed specimen were also examined. The hot-pressed Bi2(Te,Se)3 exhibited power factors of 27.3~32.3×10-4 W/m-K2 which were superior to 24.2×10-4 W/m-K2 of the ingot. The Bi2(Te,Se)3, hot-pressed after mechanical milling treatment of the powders, possessed a non-dimensional figure-of-merit of 1.02 at 100oC and exhibited extrinsic-intrinsic transition at 130oC.
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