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DOI	10.1039/c8ee03374a
	Exceptional thermoelectric performance in Mg3Sb0.6Bi1.4 for low-grade waste heat recovery
	Imasato K.; Kang S.D.; Snyder G.J.
发表日期	2019
ISSN	17545692
起始页码	965
结束页码	971
卷号	12 期号:3
英文摘要	Bi2Te3 alloys have been the most widely used n-type material for low temperature thermoelectric power generation for over 50 years, thanks to the highest efficiency in the 300-500 K temperature range relevant for low-grade waste-heat recovery. Here we show that n-type Mg3Sb0.6Bi1.4, with a thermoelectric figure-of-merit zT of 1.0-1.2 at 400-500 K, finally surpasses n-type Bi2Te3. This exceptional performance is achieved by tuning the alloy composition of Mg3(Sb1-xBix)2. The two primary mechanisms of the improvement are the band effective-mass reduction and grain size enhancement as the Mg3Bi2 content increases. The benefit of the effective-mass reduction is only effective up to the optimum composition Mg3Sb0.6Bi1.4, after which a different band dominates charge transport. The larger grains are important for minimizing grain-boundary electrical resistance. Considering the limited choice for low temperature n-type thermoelectric materials, the development of Mg3Sb0.6Bi1.4 is a significant advancement towards sustainable heat recovery technology. © 2019 The Royal Society of Chemistry.
英文关键词	Binary alloys; Bismuth compounds; Grain boundaries; Magnesium alloys; Temperature; Thermoelectric equipment; Thermoelectric power; Thermoelectricity; Waste heat; Waste heat utilization; Alloy compositions; Electrical resistances; Low-grade waste heat; Optimum composition; Recovery technology; Thermo-Electric materials; Thermoelectric figure of merit; Thermoelectric performance; Bismuth alloys; efficiency measurement; electrical power; inorganic compound; low temperature; performance assessment; power generation; technological development
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189967
作者单位	Northwestern University, Evanston, IL 60208, United States; California Institute of Technology, Pasadena, CA 91125, United States
推荐引用方式 GB/T 7714	Imasato K.,Kang S.D.,Snyder G.J.. Exceptional thermoelectric performance in Mg3Sb0.6Bi1.4 for low-grade waste heat recovery[J],2019,12(3).
APA	Imasato K.,Kang S.D.,&Snyder G.J..(2019).Exceptional thermoelectric performance in Mg3Sb0.6Bi1.4 for low-grade waste heat recovery.Energy & Environmental Science,12(3).
MLA	Imasato K.,et al."Exceptional thermoelectric performance in Mg3Sb0.6Bi1.4 for low-grade waste heat recovery".Energy & Environmental Science 12.3(2019).