Enhanced thermoelectric performance of p-type Mg3Sb2 by lithium doping and its tunability in an anionic framework

Chen Chen; Xiaofang Li; Shan Li; Xinyu Wang; Zongwei Zhang; Jiehe Sui; Feng Cao; Xingjun Liu; Qian Zhang

doi:10.1007/s10853-018-2555-2

Enhanced thermoelectric performance of p-type Mg₃Sb₂ by lithium doping and its tunability in an anionic framework

Chen Chen, Xiaofang Li, Shan Li, Xinyu Wang, Zongwei Zhang, Jiehe Sui, Feng Cao, Xingjun Liu, Qian Zhang

Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

57 Scopus citations

Abstract

Mg₃Sb₂-based Zintl compounds are considered as promising thermoelectric materials due to their low thermal conductivity and high Seebeck coefficient. In this paper, we studied the thermoelectric properties of p-type lithium (Li)-doped Mg₃Sb₂ prepared by ball milling and hot pressing. A maximum ZT value ~ 0.6 at about 773 K was achieved in Mg_2.975Li_0.025Sb₂, which was ascribed to the increased carrier concentration by Li doping. Mixed scattering mechanism is dominated at lower temperature, yielding higher carrier mobility. Isoelectronic substitution of Zn on the Mg site further increased the electrical conductivity by narrowing the band gap and decreased the lattice thermal conductivity by double substitution, contributing to an enhanced average ZT in Mg_2.475Zn_0.5Li_0.025Sb₂.

Original language	English
Pages (from-to)	16001-16009
Number of pages	9
Journal	Journal of Materials Science
Volume	53
Issue number	23
DOIs	https://doi.org/10.1007/s10853-018-2555-2
State	Published - 1 Dec 2018
Externally published	Yes

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title = "Enhanced thermoelectric performance of p-type Mg3Sb2 by lithium doping and its tunability in an anionic framework",

abstract = "Mg3Sb2-based Zintl compounds are considered as promising thermoelectric materials due to their low thermal conductivity and high Seebeck coefficient. In this paper, we studied the thermoelectric properties of p-type lithium (Li)-doped Mg3Sb2 prepared by ball milling and hot pressing. A maximum ZT value ~ 0.6 at about 773 K was achieved in Mg2.975Li0.025Sb2, which was ascribed to the increased carrier concentration by Li doping. Mixed scattering mechanism is dominated at lower temperature, yielding higher carrier mobility. Isoelectronic substitution of Zn on the Mg site further increased the electrical conductivity by narrowing the band gap and decreased the lattice thermal conductivity by double substitution, contributing to an enhanced average ZT in Mg2.475Zn0.5Li0.025Sb2.",

author = "Chen Chen and Xiaofang Li and Shan Li and Xinyu Wang and Zongwei Zhang and Jiehe Sui and Feng Cao and Xingjun Liu and Qian Zhang",

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T1 - Enhanced thermoelectric performance of p-type Mg3Sb2 by lithium doping and its tunability in an anionic framework

AU - Chen, Chen

AU - Li, Xiaofang

AU - Li, Shan

AU - Wang, Xinyu

AU - Zhang, Zongwei

AU - Sui, Jiehe

AU - Cao, Feng

AU - Liu, Xingjun

AU - Zhang, Qian

PY - 2018/12/1

Y1 - 2018/12/1

N2 - Mg3Sb2-based Zintl compounds are considered as promising thermoelectric materials due to their low thermal conductivity and high Seebeck coefficient. In this paper, we studied the thermoelectric properties of p-type lithium (Li)-doped Mg3Sb2 prepared by ball milling and hot pressing. A maximum ZT value ~ 0.6 at about 773 K was achieved in Mg2.975Li0.025Sb2, which was ascribed to the increased carrier concentration by Li doping. Mixed scattering mechanism is dominated at lower temperature, yielding higher carrier mobility. Isoelectronic substitution of Zn on the Mg site further increased the electrical conductivity by narrowing the band gap and decreased the lattice thermal conductivity by double substitution, contributing to an enhanced average ZT in Mg2.475Zn0.5Li0.025Sb2.

AB - Mg3Sb2-based Zintl compounds are considered as promising thermoelectric materials due to their low thermal conductivity and high Seebeck coefficient. In this paper, we studied the thermoelectric properties of p-type lithium (Li)-doped Mg3Sb2 prepared by ball milling and hot pressing. A maximum ZT value ~ 0.6 at about 773 K was achieved in Mg2.975Li0.025Sb2, which was ascribed to the increased carrier concentration by Li doping. Mixed scattering mechanism is dominated at lower temperature, yielding higher carrier mobility. Isoelectronic substitution of Zn on the Mg site further increased the electrical conductivity by narrowing the band gap and decreased the lattice thermal conductivity by double substitution, contributing to an enhanced average ZT in Mg2.475Zn0.5Li0.025Sb2.

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Enhanced thermoelectric performance of p-type Mg₃Sb₂ by lithium doping and its tunability in an anionic framework

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