Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Thermoelectric Properties of Skutterudite CoSb3 Prepared by Arc Melting

아크용해법으로 제조된 Skutterudite CoSb3의 열전특성

  • Yu S.W. (Dept. of Materials Science and Engineering/NT Lab., Chungju National University) ;
  • Park J.B. (Dept. of Materials Science and Engineering/NT Lab., Chungju National University) ;
  • Cho K.W. (Dept. of Materials Science and Engineering/NT Lab., Chungju National University) ;
  • Jang K.W. (Dept. of Advanced Materials Engineering, Hanseo University) ;
  • Ur S.C. (Dept. of Materials Science and Engineering/NT Lab., Chungju National University) ;
  • Lee J.I. (Dept. of Materials Science and Engineering/NT Lab., Chungju National University) ;
  • Kim I.H. (Dept. of Materials Science and Engineering/NT Lab., Chungju National University)
  • 유신욱 (충주대학교 신소재공학과/나노기술연구소) ;
  • 박종범 (충주대학교 신소재공학과/나노기술연구소) ;
  • 조경원 (충주대학교 신소재공학과/나노기술연구소) ;
  • 장경욱 (한서대학교 신소재공학과) ;
  • 어순철 (충주대학교 신소재공학과/나노기술연구소) ;
  • 이정일 (충주대학교 신소재공학과/나노기술연구소) ;
  • 김일호 (충주대학교 신소재공학과/나노기술연구소)
  • Published : 2005.02.01
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Abstract

The arc melting was employed to prepare undoped $CoSb_3$ compounds and their thermoelectric properties were investigated. Specimen annealed at $400^{\circ}C$ for 24 hrs showed sound microstructure. However, considerable voids and cracks were found after annealing at above $500^{\circ}C$. It seems to be attributed to the phase dissociation and thermal expansion due to phase transitions during annealing and cooling. Single phase $\delta-CoSb_3$ was successfully obtained by annealing at $400^{\circ}C$ for 24 hrs. In the case of increasing annealing temperature, phase decompositions occurred. Undoped $CoSb_3$ showed p-type conduction and intrinsic semiconducting behavior at all temperatures examined. Thermoelectric properties were remarkably improved by annealing and they were closely related to phase transitions.

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References

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