Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 38, Issue 7, Pages 1224-1228Publisher
SPRINGER
DOI: 10.1007/s11664-009-0776-5
Keywords
Filled skutterudites; melt spinning; nanostructure; thermoelectric properties
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Single-phase nanostructured bulk Yb(0.2)Co(4)Sb(12) skutterudites have been prepared by combining a melt spinning technique with spark plasma sintering. The effects of a pre-annealing process on the microstructure and phase composition of ribbon samples and bulk materials are investigated. After the pre-annealing process, average grain size increases from 200 nm to 300 nm for ribbon samples and from 250 nm to 350 nm for bulk materials, and nearly single-phase skutterudites have formed. Because of the nanostructure, the thermal conductivity of bulk skutterudites notably decreases 25% at 800 K. Asa a pound result, the ZT values are improved compared with starting material prepared by the traditional method.
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