Structural transition of partially Ba-filled thermoelectric CoSb{sub 3} investigated by positron annihilation spectroscopy
- School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044 (China)
Microstructure of unfilled and Ba-filled CoSb{sub 3} has been studied by positron lifetime measurements together with theoretical calculation. Positron trapping in intrinsic voids is observed in the CoSb{sub 3}, which contributes a positron lifetime of 263 ± 2 ps. After filling Ba atoms with content up to x = 0.4, the positron lifetime shows continuous increase. By comparing the experimental results with calculation following the phase diagram of Ba{sub x}Co{sub 4}Sb{sub 12} with x in the range of 0–0.5, it is found that when the Ba content is lower than 0.16, the filling of Ba atoms is in a phase of solid solution. At x = 0.2, γ phase is formed, which is mixed with solid solution. At x > 0.25, transition from γ phase to a mixture of γ and α phases is confirmed.
- OSTI ID:
- 22413063
- Journal Information:
- Journal of Applied Physics, Vol. 117, Issue 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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