Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Thermoelectric Properties of Binary Skutterudite CoSb3 Prepared by Encapsulated Induction Melting

밀폐유도용해로 제조된 2원계 Skutterudite CoSb3의 열전특성

  • You, Sin-Wook (Research Center for Sustainable ECo-Devices and Materials(ReSEM), Chungju National University) ;
  • Jung, Jae-Yong (Department of Materials Science and Engineering/ReSEM, Chungju National University) ;
  • Ur, Soon-Chul (Department of Materials Science and Engineering/ReSEM, Chungju National University) ;
  • Kim, Il-Ho (Department of Materials Science and Engineering/ReSEM, Chungju National University)
  • 유신욱 (충주대학교 친환경 에너지 변환.저장소재 및 부품개발 연구센터) ;
  • 정재용 (충주대학교 신소재공학과/친환경 에너지 변환.저장소재 및 부품개발 연구센터) ;
  • 어순철 (충주대학교 신소재공학과/친환경 에너지 변환.저장소재 및 부품개발 연구센터) ;
  • 김일호 (충주대학교 신소재공학과/친환경 에너지 변환.저장소재 및 부품개발 연구센터)
  • Published : 2006.05.27
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Abstract

Binary skutterudite $CoSb_3$ compounds were prepared by the encapsulated induction melting (EIM) process, and their thermoelectric, microstructural and mechanical properties were examined. Single-phase ${\delta}-CoSb_3$ was successfully produced by the EIM and subsequent heat treatment at 773 K-873 K for 24 hours in vacuum. Seebeck coefficient increased with increasing heat treatment temperature up to 673 K, showing the positive signs in the range of measuring temperature. However, the samples heat-treated at 773 K-873 K showed negative Seebeck coefficient from room temperature to 400 K, while it showed positive signs above 400 K. Electrical resistivity decreased with increasing temperature, showing typical semiconducting conductivity. Thermal conductivity decreased drastically with increasing heat-treatment temperature. This is closely related with the phase transition to ${\delta}-CoSb_3$.

Keywords

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