| Autor: |
Zhang, Long, Duan, Fenfen, Li, Xiaodong, Yan, Xinlin, Hu, Wentao, Wang, Limin, Liu, Zhongyuan, Tian, Yongjun, Xu, Bo |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; Aug2013, Vol. 114 Issue 8, p083715, 6p, 1 Color Photograph, 1 Black and White Photograph, 1 Chart, 8 Graphs |
| Abstrakt: |
The best p-type skutterudites are all Fe-rich and show larger coefficient of thermal expansion than CoSb3-based n-type skutterudites, which deteriorate the reliability of thermoelectric couples constituted by p- and n-skutterudites. In this study, we synthesize Nd0.6Fe2Co2Sb12-xGex (0≤x≤1) with equal amounts of Fe and Co. Microstructure analysis reveals a unique microstructure of precipitate phases, including nanoprecipitates in skutterudite matrix, structurally imperfect nanoparticles (less than 100 nm), and unprecedented thin-layer coverings about 10 nm thick. Such rich microstructures dominate the scattering of phonons with full-length scale and remarkably suppress the lattice thermal conductivity. As a result, ZT for Nd0.6Fe2Co2Sb11.7Ge0.3 is 50% improved compared with that of a Ge free sample even with a moderately decreased power factor. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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