Enhanced Thermoelectric Performance in N-Type Mg3.2Sb1.5Bi0.5 by La or Ce Doping into Mg

Fan Zhang; Chen Chen; Shan Li; Li Yin; Bo Yu; Jiehe Sui; Feng Cao; Xingjun Liu; Zhifeng Ren; Qian Zhang

doi:10.1002/aelm.201901391

Enhanced Thermoelectric Performance in N-Type Mg_3.2Sb_1.5Bi_0.5 by La or Ce Doping into Mg

Fan Zhang, Chen Chen, Shan Li, Li Yin, Bo Yu, Jiehe Sui, Feng Cao, Xingjun Liu, Zhifeng Ren, Qian Zhang

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

27 Scopus citations

Abstract

N-type Mg_3.2Sb_1.5Bi_0.5 materials are prepared by cation-site doping with lanthanides (La, Ce). Both La- and Ce-doped samples exhibit a higher doping limit and greater efficiency than those of chalcogen (Te, Se, S)-doped n-type Mg_3.2Sb_1.5Bi_0.5 samples. High electron carrier concentration ≈9 × 10¹⁹ cm⁻³ is obtained in Mg_3.18La_0.02Sb_1.5Bi_0.5 and Mg_3.185Ce_0.015Sb_1.5Bi_0.5, which is close to the theoretical doping-concentration limit and induces contributions from more electron bands. A higher electrical conductivity was thus obtained and is beneficial to the enhanced ZT values for lanthanide-doped Mg_3.2Sb_1.5Bi_0.5. The highest ZT value ≈1.6 is achieved in Mg_3.19La_0.01Sb_1.5Bi_0.5 at 693 K, along with a ZT ≈1.50 in Mg_3.19Ce_0.01Sb_1.5Bi_0.5 at 693 K, indicating that lanthanides provide a promising doping strategy for Mg_3.2Sb_1.5Bi_0.5-based materials.

Original language	English
Article number	1901391
Journal	Advanced Electronic Materials
Volume	6
Issue number	3
DOIs	https://doi.org/10.1002/aelm.201901391
State	Published - 1 Mar 2020
Externally published	Yes

Keywords

Mg Sb
Seebeck coefficient
thermal conductivity
thermoelectrics

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10.1002/aelm.201901391

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title = "Enhanced Thermoelectric Performance in N-Type Mg3.2Sb1.5Bi0.5 by La or Ce Doping into Mg",

abstract = "N-type Mg3.2Sb1.5Bi0.5 materials are prepared by cation-site doping with lanthanides (La, Ce). Both La- and Ce-doped samples exhibit a higher doping limit and greater efficiency than those of chalcogen (Te, Se, S)-doped n-type Mg3.2Sb1.5Bi0.5 samples. High electron carrier concentration ≈9 × 1019 cm−3 is obtained in Mg3.18La0.02Sb1.5Bi0.5 and Mg3.185Ce0.015Sb1.5Bi0.5, which is close to the theoretical doping-concentration limit and induces contributions from more electron bands. A higher electrical conductivity was thus obtained and is beneficial to the enhanced ZT values for lanthanide-doped Mg3.2Sb1.5Bi0.5. The highest ZT value ≈1.6 is achieved in Mg3.19La0.01Sb1.5Bi0.5 at 693 K, along with a ZT ≈1.50 in Mg3.19Ce0.01Sb1.5Bi0.5 at 693 K, indicating that lanthanides provide a promising doping strategy for Mg3.2Sb1.5Bi0.5-based materials.",

keywords = "Mg Sb, Seebeck coefficient, thermal conductivity, thermoelectrics",

author = "Fan Zhang and Chen Chen and Shan Li and Li Yin and Bo Yu and Jiehe Sui and Feng Cao and Xingjun Liu and Zhifeng Ren and Qian Zhang",

note = "Publisher Copyright: {\textcopyright} 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2020",

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doi = "10.1002/aelm.201901391",

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T1 - Enhanced Thermoelectric Performance in N-Type Mg3.2Sb1.5Bi0.5 by La or Ce Doping into Mg

AU - Zhang, Fan

AU - Chen, Chen

AU - Li, Shan

AU - Yin, Li

AU - Yu, Bo

AU - Sui, Jiehe

AU - Cao, Feng

AU - Liu, Xingjun

AU - Ren, Zhifeng

AU - Zhang, Qian

PY - 2020/3/1

Y1 - 2020/3/1

N2 - N-type Mg3.2Sb1.5Bi0.5 materials are prepared by cation-site doping with lanthanides (La, Ce). Both La- and Ce-doped samples exhibit a higher doping limit and greater efficiency than those of chalcogen (Te, Se, S)-doped n-type Mg3.2Sb1.5Bi0.5 samples. High electron carrier concentration ≈9 × 1019 cm−3 is obtained in Mg3.18La0.02Sb1.5Bi0.5 and Mg3.185Ce0.015Sb1.5Bi0.5, which is close to the theoretical doping-concentration limit and induces contributions from more electron bands. A higher electrical conductivity was thus obtained and is beneficial to the enhanced ZT values for lanthanide-doped Mg3.2Sb1.5Bi0.5. The highest ZT value ≈1.6 is achieved in Mg3.19La0.01Sb1.5Bi0.5 at 693 K, along with a ZT ≈1.50 in Mg3.19Ce0.01Sb1.5Bi0.5 at 693 K, indicating that lanthanides provide a promising doping strategy for Mg3.2Sb1.5Bi0.5-based materials.

AB - N-type Mg3.2Sb1.5Bi0.5 materials are prepared by cation-site doping with lanthanides (La, Ce). Both La- and Ce-doped samples exhibit a higher doping limit and greater efficiency than those of chalcogen (Te, Se, S)-doped n-type Mg3.2Sb1.5Bi0.5 samples. High electron carrier concentration ≈9 × 1019 cm−3 is obtained in Mg3.18La0.02Sb1.5Bi0.5 and Mg3.185Ce0.015Sb1.5Bi0.5, which is close to the theoretical doping-concentration limit and induces contributions from more electron bands. A higher electrical conductivity was thus obtained and is beneficial to the enhanced ZT values for lanthanide-doped Mg3.2Sb1.5Bi0.5. The highest ZT value ≈1.6 is achieved in Mg3.19La0.01Sb1.5Bi0.5 at 693 K, along with a ZT ≈1.50 in Mg3.19Ce0.01Sb1.5Bi0.5 at 693 K, indicating that lanthanides provide a promising doping strategy for Mg3.2Sb1.5Bi0.5-based materials.

KW - Mg Sb

KW - Seebeck coefficient

KW - thermal conductivity

KW - thermoelectrics

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ER -

Enhanced Thermoelectric Performance in N-Type Mg_3.2Sb_1.5Bi_0.5 by La or Ce Doping into Mg

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