Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Fe Doping on Thermoelectric Properties of Mechanically Alloyed $CoSb_3$

  • Ur, Soon-Chul (Dept. of MSE/ Research Center for Sustainable ECo-Devices and Materials(ReSEM) Chungju National University) ;
  • Kwon, Joon-Chul (Dept. of MSE/ Research Center for Sustainable ECo-Devices and Materials(ReSEM) Chungju National University) ;
  • Kim, Il-Ho (Dept. of MSE/ Research Center for Sustainable ECo-Devices and Materials(ReSEM) Chungju National University)
  • Published : 2006.09.24
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Abstract

Fe doped skutterudite $CoSb_3$ with a nominal composition of $Fe_xCo_{1-x}Sb_{12}(0{\leq}x{\leq}2.5)$ have been synthesized by mechanical alloying (MA) of elemental powders, followed by vacuum hot pressing. Phase transformations during mechanical alloying and vacuum hot pressing were systematically investigated using XRD. Single phase skutterudite was successfully produced by vacuum hot pressing using as-milled powders without subsequent annealing. However, second phase of $FeSb_2$ was found to exist in case of $x\geq2$, suggesting the solubility limit of Fe with Co in this system. Thermoelectric properties as functions of temperature and Fe contents were evaluated for the hot pressed specimens. Fe doping up to x=1.5 with Co in $Fe_xCo_{4-x}Sb_{12}$ appeared to increase thermoelectric figure of merit (ZT) and the maximum ZT was found to be 0.78 at 525K in this study.

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