Enhanced thermoelectric performance in p-type Mg3Sb2 via lithium doping

doi:10.1088/1674-1056/27/4/047212

Abstract The Zintl compound Mg₃Sb₂ has been recently identified as promising thermoelectric material owing to its high thermoelectric performance and cost-effective, nontoxicity and environment friendly characteristics. However, the intrinsically p-type Mg₃Sb₂ shows low figure of merit (zT=0.23 at 723 K) for its poor electrical conductivity. In this study, a series of Mg_3-xLi_xSb₂ bulk materials have been prepared by high-energy ball milling and spark plasma sintering (SPS) process. Electrical transport measurements on these materials revealed significant improvement on the power factor with respect to the undoped sample, which can be essentially attributed to the increased carrier concentration, leading to a maximum zT of 0.59 at 723 K with the optimum doping level x=0.01. Additionally, the engineering zT and energy conversion efficiency are calculated to be 0.235 and 4.89%, respectively. To our best knowledge, those are the highest values of all reported p-type Mg₃Sb₂-based compounds with single element doping.

Keywords: p-type Mg₃Sb₂ Zintl compounds lithium doping carrier concentration enhanced thermoelectric properties

Received: 22 January 2018
Revised: 05 March 2018
Accepted manuscript online:

PACS:	72.20.Pa	(Thermoelectric and thermomagnetic effects)
	73.50.Lw	(Thermoelectric effects)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. U1601213 and 51572287) and the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-SLH013).

Corresponding Authors: †Jun Liu: liujun4982004@csu.edu.cn; ‡Huaizhou Zhao:Hzhao@iphy.ac.cn

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Hao Wang(王浩), Jin Chen(陈进), Tianqi Lu(陆天奇), Kunjie Zhu(朱坤杰), Shan Li(李珊), Jun Liu(刘军), Huaizhou Zhao(赵怀周) Enhanced thermoelectric performance in p-type Mg₃Sb₂ via lithium doping 2018 Chin. Phys. B 27 047212

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Enhanced thermoelectric performance in p-type Mg3Sb2 via lithium doping

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Enhanced thermoelectric performance in p-type Mg₃Sb₂ via lithium doping