플라즈마 아크 방전법에 의한 Bi-Sb-Te 나노 열전분말 제조
Synthesis of Bi-Sb-Te Thermoelectric Nanopowder by the Plasma Arc Discharge Process
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초록
The present study focused on the synthesis of a bismuth-antimony-tellurium-based thermoelectric nanopowders using plasma arc discharge process. The chemical composition, phase structure, particle size of the synthesized powders under various synthesis conditions were analyzed using XRF, XRD and SEM. The powders as synthesized were sintered by the plasma activated sintering. The thermoelectric properties of sintered body were analyzed by measuring Seebeck coefficient, specific electric resistivity and thermal conductivity. The chemical composition of the synthesized Bi-Sb-Te-based powders approached that of the raw material with an increasing DC current of the arc plasma. The synthesized Bi-Sb-Te-based powder consist of a mixed phase structure of the Bi0.5Sb1.5Te3, Bi2Te3 and Sb2Te3 phases. This powder has homogeneous mixing state of two different particles in an average particle size; about 100 nm and about 500 nm. The figure of merit of the sintered body of the synthesized 18.75 wt.%Bi-24.68 wt.%Sb-56.57 wt.%Te nanopowder showed higher value than one of the sintered body of the mechanically milled 12.64 wt.%Bi-29.47 wt.%Sb-57.89 wt.%Te powder.
Abstract
The present study focused on the synthesis of a bismuth-antimony-tellurium-based thermoelectric nanopowders using plasma arc discharge process. The chemical composition, phase structure, particle size of the synthesized powders under various synthesis conditions were analyzed using XRF, XRD and SEM. The powders as synthesized were sintered by the plasma activated sintering. The thermoelectric properties of sintered body were analyzed by measuring Seebeck coefficient, specific electric resistivity and thermal conductivity. The chemical composition of the synthesized Bi-Sb-Te-based powders approached that of the raw material with an increasing DC current of the arc plasma. The synthesized Bi-Sb-Te-based powder consist of a mixed phase structure of the Bi0.5Sb1.5Te3, Bi2Te3 and Sb2Te3 phases. This powder has homogeneous mixing state of two different particles in an average particle size; about 100 nm and about 500 nm. The figure of merit of the sintered body of the synthesized 18.75 wt.%Bi-24.68 wt.%Sb-56.57 wt.%Te nanopowder showed higher value than one of the sintered body of the mechanically milled 12.64 wt.%Bi-29.47 wt.%Sb-57.89 wt.%Te powder.
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