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Title: Revelation of Inherently High Mobility Enables Mg 3Sb 2 as a Sustainable Alternative to n-Bi 2Te 3 Thermoelectrics

Abstract

Over the past years, thermoelectric Mg 3Sb 2 alloys particularly in n-type conduction, have attracted increasing attentions for thermoelectric applications, due to the multivalley conduction band, abundance of constituents, and less toxicity. However, the high vapor pressure, causticity of Mg, and the high melting point of Mg 3Sb 2 tend to cause the inclusion in the materials of boundary phases and defects that affect the transport properties. In this work, a utilization of tantalum-sealing for melting enables n-type Mg 3Sb 2 alloys to show a substantially higher mobility than ever reported, which can be attributed to the purification of phases and to the coarse grains. Importantly, the inherently high mobility successfully enables the thermoelectric figure of merit in optimal compositions to be highly competitive to that of commercially available n-type Bi 2Te 3 alloys and to be higher than that of other known n-type thermoelectrics at 300-500 K. This work reveals Mg 3Sb 2 alloys as a top candidate for near-room-temperature thermoelectric applications.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2]; ORCiD logo [1]
  1. Tongji Univ., Shanghai (China). School of Materials Science and Engineering, Interdisciplinary Materials Research Center
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1560221
Alternate Identifier(s):
OSTI ID: 1560224; OSTI ID: 1560607
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Advanced Science
Additional Journal Information:
Journal Volume: 6; Journal Issue: 16; Journal ID: ISSN 2198-3844
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Shi, Xuemin, Sun, Cheng, Bu, Zhonglin, Zhang, Xinyue, Wu, Yixuan, Lin, Siqi, Li, Wen, Faghaninia, Alireza, Jain, Anubhav, and Pei, Yanzhong. Revelation of Inherently High Mobility Enables Mg3Sb2 as a Sustainable Alternative to n-Bi2Te3 Thermoelectrics. United States: N. p., 2019. Web. doi:10.1002/advs.201802286.
Shi, Xuemin, Sun, Cheng, Bu, Zhonglin, Zhang, Xinyue, Wu, Yixuan, Lin, Siqi, Li, Wen, Faghaninia, Alireza, Jain, Anubhav, & Pei, Yanzhong. Revelation of Inherently High Mobility Enables Mg3Sb2 as a Sustainable Alternative to n-Bi2Te3 Thermoelectrics. United States. doi:10.1002/advs.201802286.
Shi, Xuemin, Sun, Cheng, Bu, Zhonglin, Zhang, Xinyue, Wu, Yixuan, Lin, Siqi, Li, Wen, Faghaninia, Alireza, Jain, Anubhav, and Pei, Yanzhong. Tue . "Revelation of Inherently High Mobility Enables Mg3Sb2 as a Sustainable Alternative to n-Bi2Te3 Thermoelectrics". United States. doi:10.1002/advs.201802286.
@article{osti_1560221,
title = {Revelation of Inherently High Mobility Enables Mg3Sb2 as a Sustainable Alternative to n-Bi2Te3 Thermoelectrics},
author = {Shi, Xuemin and Sun, Cheng and Bu, Zhonglin and Zhang, Xinyue and Wu, Yixuan and Lin, Siqi and Li, Wen and Faghaninia, Alireza and Jain, Anubhav and Pei, Yanzhong},
abstractNote = {Over the past years, thermoelectric Mg3Sb2 alloys particularly in n-type conduction, have attracted increasing attentions for thermoelectric applications, due to the multivalley conduction band, abundance of constituents, and less toxicity. However, the high vapor pressure, causticity of Mg, and the high melting point of Mg3Sb2 tend to cause the inclusion in the materials of boundary phases and defects that affect the transport properties. In this work, a utilization of tantalum-sealing for melting enables n-type Mg3Sb2 alloys to show a substantially higher mobility than ever reported, which can be attributed to the purification of phases and to the coarse grains. Importantly, the inherently high mobility successfully enables the thermoelectric figure of merit in optimal compositions to be highly competitive to that of commercially available n-type Bi2Te3 alloys and to be higher than that of other known n-type thermoelectrics at 300-500 K. This work reveals Mg3Sb2 alloys as a top candidate for near-room-temperature thermoelectric applications.},
doi = {10.1002/advs.201802286},
journal = {Advanced Science},
number = 16,
volume = 6,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1002/advs.201802286

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