- Thermoelectric Properties of Half-Heusler ZrNiSn1-xSbx Synthesized by Mechanical Alloying Process and Vacuum Hot Pressing
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Soon-Chul Ur
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J Korean Powder Metall Inst. 2011;18(5):401-405.
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DOI: https://doi.org/10.4150/KPMI.2011.18.5.401
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 Abstract
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- Half-heusler phase ZrNiSn is one of the potential thermoelectric materials for high temperature application. In an attempt to investigate the effect of Sb doping on thermoelectric properties, half-heusler phase ZrNiSn_1-xSb_x (0leqxleq0.08) was synthesized by mechanical alloying of stoichiometric elemental powder compositions, and consolidated by vacuum hot pressing. Phase transformations during mechanical alloying and hot consolidation were investigated using XRD. Sb doped ZrNiSn was successfully produced in all doping ranges by vacuum hot pressing using as-milled powders without subsequent annealing. Thermoelectric properties as functions of temperature and Sb contents were evaluated for the hot pressed specimens. Sb doping up to x=0.04 in ZrNiSn_1-xSb_x was shown to be effective on thermoelectric properties and the figure of merit (ZT) was shown to reach to the maximum at x=0.02 in this study.
- Thermoelectric Properties of Skutterudite FexCo4-xSb12 Synthesized by Mechanical Alloying Process
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Joon-Chul Kwon, Il-Ho Kim, Soon-Chul Ur
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J Korean Powder Metall Inst. 2005;12(5):357-361.
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DOI: https://doi.org/10.4150/KPMI.2005.12.5.357
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Abstract
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- Fe-doped skutterudite CoSb_3 with a nominal composition of Fe_xCo_4-xSb_12(0;le;x;le;2.5) has been synthesized by mechanical alloying (MA) of elemental powders, followed by hot pressing. Phase transformations during mechanical alloying and 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 in the form of marcasite structure FeSb_2 was found to exist in case of x;ge;2, 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 substitution up to x=1.5 with Co in Fe_xCo_4-xSb_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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