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	Effect of mixed grain sizes on thermoelectric performance of Bi2Te3 compound
	Zhao, Li-Dong ; Zhang, Bo-Ping ; Liu, Wei-Shu ; Li, Jing-Feng
	2010-10-12 ; 2010-10-12
关键词	bismuth compounds electrical resistivity grain size nanocomposites nanoparticles percolation Seebeck effect thermal conductivity N-TYPE PBTE ALLOYS Physics, Applied
中文摘要	Coarse (about 1 mu m) and fine (about 100 nm) Bi2Te3 particles were synthesized by mechanical alloying for different times, respectively. Their mixtures at different ratios were consolidated by spark plasma sintering to produce nano-/microstructured composites with the same chemical compositions. The Seebeck coefficient was significantly enhanced by addition of fine particles through the potential barrier scattering. The electrical resistivity increased rapidly when the weight fraction of fine particles exceeded about 60%, probably due to an effect similar to percolation phenomenon. However, the thermal conductivity was reduced almost linearly with increasing fraction of fine particles. Because of the combined effects of the potential barrier scattering, nonlinear change in electrical property and linear change in thermal transport property, a peak value of dimensionless figure of merit (ZT) was achieved for the sample containing 60% fine particles. This study demonstrated the possibility to enhance ZT value by introducing nonuniform microstructures even without changing chemical compositions.
语种	英语 ; 英语
出版者	AMER INST PHYSICS ; MELVILLE ; CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/78286]
专题	清华大学
推荐引用方式 GB/T 7714	Zhao, Li-Dong,Zhang, Bo-Ping,Liu, Wei-Shu,et al. Effect of mixed grain sizes on thermoelectric performance of Bi2Te3 compound[J],2010, 2010.
APA	Zhao, Li-Dong,Zhang, Bo-Ping,Liu, Wei-Shu,&Li, Jing-Feng.(2010).Effect of mixed grain sizes on thermoelectric performance of Bi2Te3 compound..
MLA	Zhao, Li-Dong,et al."Effect of mixed grain sizes on thermoelectric performance of Bi2Te3 compound".(2010).

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