Korean Journal of Materials Research, Vol.16, No.10, 647-651, October, 2006
기계적 합금화법으로 제조된 나노 미세 구조 FexCo4-xSb12의 열전 특성 및 전자 이동 특성
Thermoelectric and Electronic Transport Properties of Nano-structured FexCo4-xSb12 Prepared by Mechanical Alloying Process
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A new class of compounds in the form of skutterudite structure, Fe doped with a nominal composition of (), were synthesized by mechanical alloying of elemental powders followed by vacuum hot pressing. Nanostructured, single-phase skutterudites were successfully produced by vacuum hot pressing using as-milled powders without subsequent heat-treatments for the compositions of . However, second phase was found to form in case of , suggesting the solubility limit of Fe with Co in this system. Thermoelectric properties including thermal conductivity from 300 to 600 K were measured and discussed. Lattice thermal conductivity was greatly reduced by introducing a dopant up to x=1.5 as well as by increasing phonon scattering in nanostructured skutterudite, leading to enhancement in the thermoelectric figure of merit. The maximum figure of merit was found to be 0.32 at 600 K in the composition of .
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