가압소결온도에 따른 p형 (Bi_(0.2)Sb_(0.8)₂Te₃가압소결체의 열전특성
Thermoelectric Properties of the p-type (Bi_(0.2)Sb_(0.8)₂Te₃with Variation of the Hot-Pressing Temperature
1
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
p형 (Bi_(0.2)Sb_(0.8)₂Te₃분말을 기계적 합금화 공정으로 제조하여 가압소결 후 가압소결온도에 따른 열전특성을분석하였다. 가압소결온도를 350℃에서 550℃로 증가시킴에 따라 상온에서 측정한 Seebeck 계수가 237 μV/K에서210 μV/K로 감소하고 전기비저항이 2.25 mΩ-cm에서 1.34 mΩ-cm로 감소하였으며, power factor가 25.0×10^(-4)W/m-K²에서 32.9×10^(-4) W/m-K²로 증가하였다. 350~550℃의 온도범위에서 가압소결한 시편들 중에서, 500℃에서 가압소결한(Bi_(0.2)Sb_(0.8)₂Te₃가압소결체가 상온에서 1.09 및 75℃에서 1.2의 가장 높은 무차원 성능지수를 나타내었다.
Abstract
The p-type(Bi_(0.2)Sb_(0.8)₂Te₃powers were fabricated by mechanical alloying and hot-pressed at temperatures of 350~550℃. Themoelectric properties of the hot-pressed (Bi_(0.2)Sb_(0.8)₂Te₃were characterized as a function of the hotpressing temperature. With increasing the hot-pressing temperature from 350℃to 550℃, the Seebeck coefficient and the electrical resistivity decreased from 237 μV/K to 210 μV/K and 2.25 mΩ-cm to 1.34 mΩ-cm, respectively. The power factor of the hot-pressed (Bi_(0.2)Sb_(0.8)₂Te₃became larger from 25.0×10^(-4)W/m-K² to 32.9×10^(-4) W/m-K² with increasing the hot-pressing temperature from 350℃ to 550℃. Among the specimens hot-pressed at 350~550℃, the (Bi_(0.2)Sb_(0.8)₂Te₃hot-pressed at 500℃ exhibited the maximum dimensionless figure-of-merit of 1.09 at 25℃ and 1.2 at 75℃.
참고문헌 (11)
- A. J. Minnich, "Bulk Nanostructured Thermoelectric Materials: Current Research and Future Prospects", Energy Environ. Sci, (2), pp.466~ (2009)
- D. H. Park, "Thermoelectric Energyconversion Characteristics of the n-type Bi2(Te,Se)3 Nanocomposites Processed with Carbon Nanotube Dispersion", Current Appl. Phys, (11), pp.41~ (2011)
- 박동현, "n형 Bi2(Te,Se)3 가압소결체의 열전특성", 마이크로전자 및 패키징학회지, 17(2), pp.49~54 (2010), 한국마이크로전자및패키징학회
- 여용희, "ZrO2를 나노개재물로 첨가한 p형 (Bi,Sb)2Te3 나노벌크 가압소결체의 열전특성", 마이크로전자 및 패키징학회지, 17(3), pp.51~57 (2010), 한국마이크로전자및패키징학회
- M. S. Dresselhaus, "New Directions for Low-dimensional Thermoelectric Materials", Adv. Mater, (19), pp.1~ (2007)
- D. M. Rowe, "Thermoelectric Waste Heat Recovery as a Renewable Energy Source", Inter. J. Inno. Energy Sys. Power, 1(1), pp.13~ (2006)
- T. S. Oh, "Thermoelectric Characteristics of the p-type (Bi,Sb)2Te3", (Pb,Sn)Te Functional Gradient Materials with Variation of the Segment Ratio, 2009, pp.(38), 1041~
- B. Poudel, "High-thermoelectric Performance of Nanostructured Bismuth Antimony Telluride Bulk Alloys", Science, (320), pp.634~ (2008)
- X. B. Zhao, "Bismuth Telluride Nanotubes and the Effects on the Thermoelectric Properties of Nanotube-containing Nanocomposites", Appl. Phys. Lett, (86), pp.62111~ (2005)
- W. M. Yim, "Compound Telluride and Their Alloys for Peltier Cooling-A Review", J. Solid State Electron, (15), pp.1121~ (1972)
- J. Horak, "Energy Formation of Antisite Defects in Doped Sb2Te3 and Bi2Te3 Crystals", J. Phys. Chem. Solids, (47), pp.805~ (1986)