Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Thermal Stability of the Thermoelectric Skutterudite $In_{0.25}Co_3MnSb_{12}$

  • Park, Kwan-Ho (Energy and Environmental Materials Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Seo, Won-Seon (Energy and Environmental Materials Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Choi, Soon-Mok (School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education) ;
  • Kim, Il-Ho (Department of Materials Science and Engineering, Korea National University of Transportation)
  • Received : 2013.08.13
  • Published : 2014.01.15
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Abstract

The skutterudite $R_yCo_{4-x}T_xSb_{12}$ is a candidate material for thermoelectric power generation in the mid-temperature range (500 - 800 K) because its thermoelectric properties can be enhanced by doping (T: dopant) and filling (R: filler or rattler). The thermal stability of skutterudite-based thermoelectric modules is of great importance because they are used at elevated temperatures. This study examined the high-temperature stability of In-filled and Mn-doped skutterudites ($In_{0.25}Co_3MnSb_{12}$) as a function of the aging variables: atmosphere (vacuum and air), temperature and time. Sb-based oxides are produced preferentially when the skutterudites are exposed to high temperatures in air. The oxide layer produced during aging at 823 K in air was much thinner than that produced during aging at 723 K in air. The formation of InSb is believed to retard the oxidation of Sb and InSb is believed to act as an obstacle to the growth of the oxide layer. The $CoSb_3$-based skutterudites were stable at 823 K if they were not exposed to air, and no InSb phases were produced in the $In_{0.25}Co_3MnSb_{12}$ skutterudites.

Keywords

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