Excellent performance stability of Ba and In double-filled skutterudite thermoelectric materials
| Autor: | Xuan Yang, Jian Yu, Wenyu Zhao, Chun-Lei Dong, Qingjie Zhang, Ping Wei |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Quenching
Materials science Polymers and Plastics Period (periodic table) Metallurgy Metals and Alloys Analytical chemistry engineering.material Microstructure Thermoelectric materials Electronic Optical and Magnetic Materials Thermal conductivity Thermoelectric effect Ceramics and Composites engineering Grain boundary Skutterudite |
| Zdroj: | Acta Materialia. 59:3244-3254 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2011.01.064 |
| Popis: | The microstructure and thermoelectric properties of Ba and In double-filled Ba0.3In0.2Co3.95Ni0.05Sb12 materials with a figure-of-merit (ZT) of 1.2 at 800 K were carefully investigated by periodic quenching from 723 K to room temperature. The quenching treatment caused enrichment of Ba and loss of Sb and Co on the grain boundaries but had no effect on In and Ni. The enhancement in |α| in the starting period is due to the reduction in σ induced by the secondary precipitates. The reductions in σ, κ and κE are attributed to the secondary precipitates. The increase in κL is assumed to be due to the separation of Ba filler from the Sb-icosahedron voids. A promising ZT value of ∼1.0 remained after quenching 2000 times. It is concluded that the double-filled skutterudite materials have excellent performance stability under periodically fluctuating environmental temperature. |
| Databáze: | OpenAIRE |
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