ZrO2를 나노개재물로 첨가한 p형 (Bi,Sb)2Te3 나노벌크 가압소결체의 열전특성
Thermoelectric Characteristics of the p-type (Bi,Sb)2Te3 Nano-Bulk Hot-Pressed with Addition of ZrO2 as Nano Inclusions
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초록
p형 (Bi,Sb)2Te3 분말을 용해/분쇄법으로 제조하여 가압소결 후 가압소결조건에 따른 열전특성을 분석하였으며,나노개재물로서 ZrO2의 첨가에 따른 열전특성의 변화거동을 분석하였다. 가압소결온도를 350oC에서 550oC로 증가시킴에따라 가압소결체의 Seebeck 계수가 275 μV/K에서 230 μV/K로 감소하였으며, 전기비저항이 6.68 mΩ-cm에서 1.86 mΩ-cm 로 감소하였다. 1 vol% 이상의 ZrO2 함량 증가에 따라 power factor가 계속 감소하는 거동으로부터 (Bi,Sb)2Te3 가압소결체의 최대 power factor를 얻을 수 있는 ZrO2 나노개재물의 최적 함량은 1 vol% 미만으로 판단되었다.
Abstract
Thermoelectric properties of the p-type (Bi,Sb)2Te3, hot-pressed with the (Bi,Sb)2Te3 powders fabricated by melting/grinding method, were characterized with variation of the hot-pressing conditions. Thermoelectric characteristics of the hot-pressed (Bi,Sb)2Te3 were also analyzed with addition of ZrO2 as nano inclusions. With increasing the hotpressing temperature from 350oC to 550oC, Seebeck coefficient and electrical resistivity decreased from 275 μV/K to 230 μV/K and 6.68 mΩ-cm to 1.86 mΩ-cm, respectively. The power factor decreased with addition of ZrO2 nano powders more than 1 vol%, implying that the optimum amount of ZrO2 nano inclusions to get a maximum power factor would be less than 1 vol%.
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