Revelation of Inherently High Mobility Enables Mg3Sb2 as a Sustainable Alternative to n-Bi2Te3 Thermoelectrics

Shi, Xuemin; Sun, Cheng; Bu, Zhonglin; Zhang, Xinyue; Wu, Yixuan; Lin, Siqi; Li, Wen; Faghaninia, Alireza; Jain, Anubhav; Pei, Yanzhong

doi:10.1002/advs.201802286

Title: Revelation of Inherently High Mobility Enables Mg₃Sb₂ as a Sustainable Alternative to n-Bi₂Te₃ Thermoelectrics

Journal Article · 10 June 2019 · Advanced Science

DOI: https://doi.org/10.1002/advs.201802286 · OSTI ID:1560221

Shi, Xuemin ^[1]; Sun, Cheng ^[1]; Bu, Zhonglin ^[1]; Zhang, Xinyue ^[1]; Wu, Yixuan ^[1]; Lin, Siqi ^[1]; Li, Wen ^[1]; Faghaninia, Alireza ^[2]; Jain, Anubhav ^[2];

^[1]

Interdisciplinary Materials Research CenterSchool of Materials Science and EngineeringTongji University 4800 Caoan Road Shanghai 201804 China
Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley CA 94720 USA

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.

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Sponsoring Organization:: USDOE Office of Science (SC); National Natural Science Foundation of China (NNSFC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1560221

Alternate ID(s):: OSTI ID: 1560224; OSTI ID: 1560607

Journal Information:: Advanced Science, Journal Name: Advanced Science Journal Issue: 16 Vol. 6; ISSN 2198-3844

Publisher:: WileyCopyright Statement

Country of Publication:: Germany

Language:: English

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