Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Electrical Properties of n-type Co-doped Fe-Si Alloy

Co 첨가 Fe-Si n형 반도체의 전기적 특성

  • Pai, Chul-Hoon (Department of Material Science and Engineering, University of Incheon) ;
  • Kim, Jeung-Gon (Division of Mechatronics, Incheon City College)
  • 배철훈 (인천대학교 공과대학 신소재공학과) ;
  • 김정곤 (인천전문대학 메카트로닉스계열)
  • Received : 2009.04.28
  • Published : 2009.12.20
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Abstract

The effect of Co additive on the electrical properties of Fe-Si alloys prepared by a RF inductive furnace was investigated. The electrical conductivity and Seebeck coefficient were measured as a function of the temperature under an Ar atmosphere to evaluate their applicability to thermoelectric energy conversion. The electrical conductivity of the specimens increased as the temperature increased, showing typical semiconducting behavior. The electrical conductivity of Co-doped specimens was higher than that of undoped specimens and increased slightly as the amount of Co additive increased. This is most likely due to the difference in the carrier concentration and the amount of residual metallic phase ${\varepsilon}$-FeSi (The ${\varepsilon}$-FeSi was detected in spite of an annealing treatment of 100 h at $830^{\circ}C$). Additionally, metallic conduction increased slightly as the amount of Co additive increased. On the other hand, Co-doped specimens showed a lower Seebeck coefficient due to the metallic phase. The power factor of Co-doped specimens was higher than that of undoped specimens. This would be affected more by the electrical conductivity compared to the Seebeck coefficient.

Keywords

Acknowledgement

Supported by : 인천대학교

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