Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Thermoelectric Properties of PbTe Prepared by Spark Plasma Sintering of Nano Powders

나노 분말을 Spark Plasma 소결해 제조한 PbTe의 열전 특성

  • Jun, Eun-Young (L&F Co. ltd.) ;
  • Kim, Ho-Young (Magnet Controlled Materials Research Group, DGIST) ;
  • Kim, Cham (Magnet Controlled Materials Research Group, DGIST) ;
  • Oh, Kyung-Sik (School of Advanced Materials Engineering, Industrial Technology Center for Environment-friendly Materials, Andong National University) ;
  • Chung, Tai-Joo (School of Advanced Materials Engineering, Industrial Technology Center for Environment-friendly Materials, Andong National University)
  • 전은영 (엘앤에프) ;
  • 김호영 ;
  • 김참 ;
  • 오경식 (국립안동대학교 신소재공학부, 친환경신소재산업지원센터) ;
  • 정태주 (국립안동대학교 신소재공학부, 친환경신소재산업지원센터)
  • Received : 2018.09.28
  • Accepted : 2018.10.11
  • Published : 2018.10.28
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Abstract

Nanoparticles of PbTe are prepared via chemical reaction of the equimolar aqueous solutions of $Pb(CH_3COO)_2$ and Te at $120^{\circ}C$. The size of the obtained particles is 100 nm after calcination in a hydrogen atmosphere. Dense specimens for the thermoelectric characterization are produced by spark plasma sintering of prepared powders at $400^{\circ}C$ to $500^{\circ}C$ under 80 MPa for 5 min. The relative densities of the prepared specimens reach approximately 97% and are identified as cubic based on X-ray diffraction analyses. The thermoelectric properties are evaluated between $100^{\circ}C$ and $300^{\circ}C$ via electrical conductivity, Seebeck coefficient, and thermal conductivity. Compared with PbTe ingot, the reduction of the thermal conductivities by more than 30% is verified via phonon scattering at the grain boundaries, which thus contributes to the increase in the figure of merit.

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