0.5 vol% TiO2 나노분말을 분산시킨 n형 Bi2(Te0.9Se0.1)3 가압소결체의 열전특성
Thermoelectric Properties of the n-type Bi2(Te0.9Se0.1)3 Processed by Hot Pressing with Dispersion of 0.5 vol% TiO2 Nanopowders
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초록
용해/분쇄법으로 제조한 n형 Bi2(Te0.9Se0.1)3 분말에 0.5 vol% TiO2 나노분말을 분산시켜 가압소결 후, TiO2나노분말의 분산이 Bi2(Te0.9Se0.1)3 가압소결체의 열전특성에 미치는 영향을 분석하였다. Bi2(Te0.9Se0.1)3 가압소결체는2.93×10-3 /K의 최대 성능지수 및 1.02의 최대 무차원 성능지수의 우수한 열전특성을 나타내었다. 0.5 vol% TiO2 나노분말의 첨가에 의해 Bi2(Te0.9Se0.1)3 가압소결체의 최대 성능지수가 2.09×10-3 /K로 감소하였으며, 최대 무차원 성능지수는0.68로 저하하였다.
Abstract
The n-type Bi2(Te0.9Se0.1)3 powders, which were fabricated by melting/grinding method and dispersed with 0.5 vol% TiO2 nanopowders, were hot-pressed in order to investigate the effects of TiO2 dispersion on the thermoelectric properties of the hot-pressed Bi2(Te0.9Se0.1)3. Excellent thermoelectric properties such as a maximum figure-of-merit of 2.93×10-3 /K and a maximum dimensionless figure-of-merit of 1.02 were obtained for the hot-pressed Bi2(Te0.9Se0.1)3. With dispersion of 0.5 vol% TiO2 nanopowders, the maximum figure-of-merit and the maximum dimensionless figure-of-merit decreased to 2.09×10-3 /K and 0.68, respectively.
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