Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Thermoelectric Properties of Sb Deficiency N-Type Skutterudite Co4Sb12

Sb가 결핍된 N형 Skutterudite Co4Sb12의 열전 특성

  • Tak, Jang-Yeul (Energy & Environment Devision, Korea Institute of Ceramic Engineering and Technology) ;
  • Van Du, Nguyen (Energy & Environment Devision, Korea Institute of Ceramic Engineering and Technology) ;
  • Jeong, Min Seok (Energy & Environment Devision, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, NaYoung (Energy & Environment Devision, Korea Institute of Ceramic Engineering and Technology) ;
  • Nam, Woo Hyun (Energy & Environment Devision, Korea Institute of Ceramic Engineering and Technology) ;
  • Seo, Won-Seon (Energy & Environment Devision, Korea Institute of Ceramic Engineering and Technology) ;
  • Cho, Jung Young (Energy & Environment Devision, Korea Institute of Ceramic Engineering and Technology)
  • 탁장렬 (한국세라믹기술원 에너지환경본부) ;
  • ;
  • 정민석 (한국세라믹기술원 에너지환경본부) ;
  • 이나영 (한국세라믹기술원 에너지환경본부) ;
  • 남우현 (한국세라믹기술원 에너지환경본부) ;
  • 서원선 (한국세라믹기술원 에너지환경본부) ;
  • 조중영 (한국세라믹기술원 에너지환경본부)
  • Received : 2019.01.09
  • Accepted : 2019.01.13
  • Published : 2019.11.01
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Abstract

In this study, we investigate the effect of an Sb-deficiency on the thermoelectric properties of double-filled n-type skutterudite ($In_{0.05}Yb_{0.15}Co_4Sb_{12-x}$). Samples were prepared by encapsulated induction melting, consecutive long-time annealing, and finally spark plasma sintering processes. The Sb-deficient sample contained a $CoSb_2$ secondary phase. Both the double-filled n-type skutterudite pristine and Sb-deficient samples showed metallic behavior in electrical conductivity with increasing temperature. The carrier concentration of the Sb-deficient sample decreased compared with that of the pristine sample. Due to a decrease in carrier concentration, the Sb deficient sample showed decreased electrical conductivity and an increased Seebeck coefficient compared with the conductivity and coefficient of the pristine sample. Furthermore, the Sb deficient sample showed an increase in the power factor (${\sigma}{\cdot}S^2$); the power factor maximum shifted to athe lower temperature side than ones of the pristine sample. As a result, the Sb-deficient sample represents an improved average figure of merit (ZT) and a $ZT_{max}$ temperature lower than that of the pristine sample. Therefore, we propose that Sb-deficient double-filled n-type skutterudite thermoelectric material ($In_{0.05}Yb_{0.15}Co_4Sb_{12-x}$) be used in the 573~673 K temperature range.

Keywords

References

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