期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 19, 期 36, 页码 25180-25185出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp04240j
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资金
- Department of Atomic Energy, Board of Research in Nuclear Sciences, Government of India [37(3)/14/22/2016-BRNS]
- BSC
- BRNS
SiGe is one of the most widely used thermoelectric materials for radioisotope thermoelectric generator applications for harnessing waste-heat at high temperatures. In the present study, we report a simple experimental strategy for enhancing the thermoelectric and mechanical properties of n-type SiGe nanoalloys by dispersing SiC nanoparticles in a SiGe nanoalloy matrix. This strategy yielded a high value of figure-of-merit (ZT) of similar to 1.7 at 900 degrees C in the SiGe/SiC nanocomposite, which is nearly twice that reported for its pristine bulk counterpart and similar to 15% higher than that of pristine SiGe nanoalloys. This significant enhancement in the ZT primarily originates from a reduction in the lattice thermal conductivity, owing to a high density of nano-scale interfaces, lattice-scale modulations and mass fluctuations, which lead to extensive scattering of heat-carrying phonons. The dispersion of SiC nanoparticles also significantly enhances the mechanical properties of the resulting SiGe/SiC nanocomposite, including fracture toughness and hardness. The enhancement in the thermoelectric and mechanical properties of the SiGe/SiC nanocomposites has been correlated with their microstructural features, elucidated employing X-ray diffraction, and scanning and transmission electron microscopy.
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