텅스텐 분말을 분산시킨 Bi_2(Te_(0.9)Se_(0.1))₃가압소결체의 열전특성
Thermoelectric Properties of the Hot-pressed Bi_2(Te_(0.9)Se_(0.1))₃with Dispersion of Tungsten Powders
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초록
n형Bi_2(Te_(0.9)Se_(0.1))₃분말을 기계적 합금화 공정으로 제조하고 텅스텐 분말을 분산시켜 550℃에서 30분간 가압소결 후, 텅스텐 함량에 따른 열전특성을 분석하였다. 텅스텐 분말을 분산시키지 않은 Bi_2(Te_(0.9)Se_(0.1))₃ 가압소결체의 상온 출력인자는 21.9×10^(-4) W/m-K² 이었으며, 1 vol% 텅스텐 분말의 분산에 의해 상온 출력인자가 30.5×10^(-4) W/m-K²로증가하였다. 텅스텐 분말을 분산시키지 않은 Bi_2(Te_(0.9)Se_(0.1))₃가압소결체는 상온에서 0.52의 무차원 성능지수를 나타내었으며, 1 vol% 텅스텐 분말의 분산에 의해 무차원 성능지수가 0.95로 크게 향상되었다.
Abstract
The n-type Bi_2(Te_(0.9)Se_(0.1))₃powers were fabricated by mechanical alloying, mixed with tungsten(W) powders,and hot-pressed at 550oC for 30 minutes. Thermoelectric properties of the hot-pressed Bi_2(Te_(0.9)Se_(0.1))₃were characterized as a function of the volume percent of tungsten-powder addition. The power factor of the hot-pressed Bi_2(Te_(0.9)Se_(0.1))₃was 21.9×10^(-4) W/m-K², and was improved to 30.5×10^(-4) W/m-K² by dispersion of 1 vol% W powders. While the dimensionless figure-of-merit of the Bi_2(Te_(0.9)Se_(0.1))₃ hot-pressed without dispersion of W powders was measured as 0.52 at room temperature, it became substantially enhanced to 0.95 with addition of 1 vol% W powders.
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