Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Synthesis and Characterization of (AgSbTe2)15(GeTe)85 Thermoelectric Powder by Gas Atomization Process

가스분무공정을 이용한 (AgSbTe2)15(GeTe)85 열전분말의 제조 및 특성평가

  • Kim, Hyo-Seob (Division of Advanced Materials Engineering and Institute for Rare Metals, Kongju National University) ;
  • Lee, Jin-Kyu (Division of Advanced Materials Engineering and Institute for Rare Metals, Kongju National University) ;
  • Koo, Jar-Myung (Division of Advanced Materials Engineering and Institute for Rare Metals, Kongju National University) ;
  • Chun, Byong-Sun (Korea Institute of Science and Technology Information) ;
  • Hong, Soon-Jik (Division of Advanced Materials Engineering and Institute for Rare Metals, Kongju National University)
  • 김효섭 (공주대학교 신소재공학부) ;
  • 이진규 (공주대학교 신소재공학부) ;
  • 구자명 (공주대학교 신소재공학부) ;
  • 천병선 (한국과학기술정보연구원) ;
  • 홍순직 (공주대학교 신소재공학부)
  • Received : 2011.08.23
  • Accepted : 2011.09.20
  • Published : 2011.10.28
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Abstract

In this study, p-type $(AgSbTe_2)_{15}(GeTe)_{85}$: TAGS-85 compound powders were prepared by gas atomization process, and then their microstructures and mechanical properties were investigated. The fabricated powders were of spherical shape, had clean surface, and illustrated fine microstructure and homogeneous $AgSbTe_2$ + GeTe solid solution. Powder X-ray diffraction results revealed that the crystal structure of the TAGS-85 sample was single rhombohedral GeTe phase, which with a space group $R_{3m}$. The grain size of the powder particles increased while the micro Vickers hardness decreased with increasing annealing temperature within the range of 573 K and 723 K due to grain growth and loss of Te. In addition, the crystal structure of the powder went through a phase transformation from rhombohedral ($R_{3m}$) at low-temperature to cubic ($F_{m-3m}$) at high-temperature with increasing annealing temperature. The micro Vickers hardness of the as-atomized powder was around 165 Hv, while it decreased gradually to 130 Hv after annealing at 673K, which is still higher than most other fabrication processes.

Keywords

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