Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 44, Issue 6, Pages 1890-1895Publisher
SPRINGER
DOI: 10.1007/s11664-014-3582-7
Keywords
Filled skutterudites; microstructure; peritectic segregation; thermoelectric properties; genomic
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Funding
- National Basic Research Program of China [2013CB632504]
- National Science Foundation of China [51372261]
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This study systematically examines the traditional melting-quenching-annealing fabrication method for filled skutterudite Yb0.3Co4Sb12 to clarify which gene most influences the phase composition, microstructure, and thermoelectric properties of the final products. X-ray diffraction, electron energy dispersive spectroscopy, scanning electron microscopy, and thermoelectric measurements suggest that the Co-Sb peritectic segregation occurring during the quenching process-which can be inherited in the following ensuing fabrication process-shows a very important genomic effect on the microstructure evolution. Severe Co-Sb peritectic segregation would increase the diffusion paths of the composed elements (Yb, Co, and Sb) during the annealing process, making it significantly more difficult to form high-performance single filled skutterudites. The traditional fabrication process can be optimized by introducing a stirring step to accelerate the cooling rate, effectively suppressing the Co-Sb peritectic segregation and consequently improving thermoelectric performance; this result has been achieved in the large-scale Yb0.3Co4Sb12 sample. Our results suggest that the control of Co-Sb peritectic segregation is critical when developing the mass production process for filled skutterudites in the future.
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