한국분말재료학회지 (Journal of Powder Materials)

  • 제18권5호
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  • Pages.437-442
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  • 2011
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  • 2799-8525(pISSN)
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  • 2799-8681(eISSN)
한국분말재료학회 (*구 분말야금학회) (The Korean Powder Metallurgy & Materials Institute)
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산화물 환원공정에 의해 제조된 Bi2Te2.7Se0.3 분말의 열전특성

Thermoelectric Properties of Bi2Te2.7Se0.3 Powder Synthesized by an Oxide-Reduction Process

  • Park, Bae-Gun (Division of Materials Science and Engineering, Pukyong National University) ;
  • Lee, Gil-Geun (Division of Materials Science and Engineering, Pukyong National University) ;
  • Kim, Woo-Yeol (Division of Materials Science and Engineering, Pukyong National University) ;
  • Ha, Gook-Hyun (Korea Institute of Materials Science)
  • 투고 : 2011.07.27
  • 심사 : 2011.09.02
  • 발행 : 2011.10.28
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초록

The present study focused on the synthesis of Bi-Te-Se-based powder by an oxide-reduction process, and analysis of the thermoelectric properties of the synthesized powder. The phase structure, chemical composition, and morphology of the synthesized powder were analyzed by XRD, EPMA and SEM. The synthesized powder was sintered by spark plasma sintering. The thermoelectric properties of the sintered body were evaluated by measuring its Seebeck coefficient, electrical resistivity, and thermal conductivity. $Bi_2Te_{2.7}Se_{0.3}$ powder was synthesized from a mixture of $Bi_2O_3$, $TeO_2$, and $SeO_2$ powders by mechanical milling, calcination, and reduction. The sintered body of the synthesized powder exhibited n-type thermoelectric characteristics. The thermoelectric properties of the sintered bodies depend on the reduction temperature. The Seebeck coefficient and electrical resistivity of the sintered body were increased with increasing reduction temperature. The sintered body of the $Bi_2Te_{2.7}Se_{0.3}$ powder synthesized at $360^{\circ}C$ showed about 0.5 of the figure of merit (ZT) at room temperature.

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