Balancing the anionic framework polarity for enhanced thermoelectric performance in YbMg2Sb2 Zintl compounds

Zongwei Zhang; Xinyu Wang; Yijie Liu; Chen Chen; Honghao Yao; Li Yin; Xiaofang Li; Shan Li; Fan Zhang; Fengxian Bai; Jiehe Sui; Bo Yu; Feng Cao; Xingjun Liu; Jun Mao; Guoqiang Xie; Qian Zhang

doi:10.1016/j.jmat.2019.08.002

Balancing the anionic framework polarity for enhanced thermoelectric performance in YbMg₂Sb₂ Zintl compounds

Zongwei Zhang, Xinyu Wang, Yijie Liu, Chen Chen, Honghao Yao, Li Yin, Xiaofang Li, Shan Li, Fan Zhang, Fengxian Bai, Jiehe Sui, Bo Yu, Feng Cao, Xingjun Liu, Jun Mao, Guoqiang Xie, Qian Zhang

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

34 Scopus citations

Abstract

1-2-2-type Zintl phase compound has aroused great interest for potential thermoelectric applications. However, YbMg₂Sb₂ is seldom studied due to the very low electrical conductivity resulting from the large difference in the electronegativity between Mg and Sb. In this paper, we adjust the covalently bonded network of Mg[sbnd]Sb by replacing part of the Mg with Zn which has the electronegativity closer to that of Sb. The decreased polarity in the anionic framework offers more free distance for electrons for the enhanced Hall mobility and electrical conductivity. Together with the increased point defect and the decreased lattice thermal conductivity by introduction of Zn, the maximum ZT value of ∼0.8 at 773 K is achieved in YbMg_0.9Zn_1.1Sb₂ which is ∼100% enhancement compared with that of YbMg₂Sb₂.

Original language	English
Pages (from-to)	583-589
Number of pages	7
Journal	Journal of Materiomics
Volume	5
Issue number	4
DOIs	https://doi.org/10.1016/j.jmat.2019.08.002
State	Published - Dec 2019
Externally published	Yes

Keywords

Electronegativity
Polarity
Thermoelectric
YbMgSb
Zintl phase

Access to Document

10.1016/j.jmat.2019.08.002

Cite this

@article{7fd14e5fe0a94d37ad2868adc9a07457,

title = "Balancing the anionic framework polarity for enhanced thermoelectric performance in YbMg2Sb2 Zintl compounds",

abstract = "1-2-2-type Zintl phase compound has aroused great interest for potential thermoelectric applications. However, YbMg2Sb2 is seldom studied due to the very low electrical conductivity resulting from the large difference in the electronegativity between Mg and Sb. In this paper, we adjust the covalently bonded network of Mg[sbnd]Sb by replacing part of the Mg with Zn which has the electronegativity closer to that of Sb. The decreased polarity in the anionic framework offers more free distance for electrons for the enhanced Hall mobility and electrical conductivity. Together with the increased point defect and the decreased lattice thermal conductivity by introduction of Zn, the maximum ZT value of ∼0.8 at 773 K is achieved in YbMg0.9Zn1.1Sb2 which is ∼100% enhancement compared with that of YbMg2Sb2.",

keywords = "Electronegativity, Polarity, Thermoelectric, YbMgSb, Zintl phase",

author = "Zongwei Zhang and Xinyu Wang and Yijie Liu and Chen Chen and Honghao Yao and Li Yin and Xiaofang Li and Shan Li and Fan Zhang and Fengxian Bai and Jiehe Sui and Bo Yu and Feng Cao and Xingjun Liu and Jun Mao and Guoqiang Xie and Qian Zhang",

note = "Publisher Copyright: {\textcopyright} 2019 The Chinese Ceramic Society",

year = "2019",

month = dec,

doi = "10.1016/j.jmat.2019.08.002",

language = "英语",

volume = "5",

pages = "583--589",

journal = "Journal of Materiomics",

issn = "2352-8478",

publisher = "Chinese Ceramic Society",

number = "4",

}

TY - JOUR

T1 - Balancing the anionic framework polarity for enhanced thermoelectric performance in YbMg2Sb2 Zintl compounds

AU - Zhang, Zongwei

AU - Wang, Xinyu

AU - Liu, Yijie

AU - Chen, Chen

AU - Yao, Honghao

AU - Yin, Li

AU - Li, Xiaofang

AU - Li, Shan

AU - Zhang, Fan

AU - Bai, Fengxian

AU - Sui, Jiehe

AU - Yu, Bo

AU - Cao, Feng

AU - Liu, Xingjun

AU - Mao, Jun

AU - Xie, Guoqiang

AU - Zhang, Qian

PY - 2019/12

Y1 - 2019/12

N2 - 1-2-2-type Zintl phase compound has aroused great interest for potential thermoelectric applications. However, YbMg2Sb2 is seldom studied due to the very low electrical conductivity resulting from the large difference in the electronegativity between Mg and Sb. In this paper, we adjust the covalently bonded network of Mg[sbnd]Sb by replacing part of the Mg with Zn which has the electronegativity closer to that of Sb. The decreased polarity in the anionic framework offers more free distance for electrons for the enhanced Hall mobility and electrical conductivity. Together with the increased point defect and the decreased lattice thermal conductivity by introduction of Zn, the maximum ZT value of ∼0.8 at 773 K is achieved in YbMg0.9Zn1.1Sb2 which is ∼100% enhancement compared with that of YbMg2Sb2.

AB - 1-2-2-type Zintl phase compound has aroused great interest for potential thermoelectric applications. However, YbMg2Sb2 is seldom studied due to the very low electrical conductivity resulting from the large difference in the electronegativity between Mg and Sb. In this paper, we adjust the covalently bonded network of Mg[sbnd]Sb by replacing part of the Mg with Zn which has the electronegativity closer to that of Sb. The decreased polarity in the anionic framework offers more free distance for electrons for the enhanced Hall mobility and electrical conductivity. Together with the increased point defect and the decreased lattice thermal conductivity by introduction of Zn, the maximum ZT value of ∼0.8 at 773 K is achieved in YbMg0.9Zn1.1Sb2 which is ∼100% enhancement compared with that of YbMg2Sb2.

KW - Electronegativity

KW - Polarity

KW - Thermoelectric

KW - YbMgSb

KW - Zintl phase

UR - http://www.scopus.com/inward/record.url?scp=85070548402&partnerID=8YFLogxK

U2 - 10.1016/j.jmat.2019.08.002

DO - 10.1016/j.jmat.2019.08.002

M3 - 文章

AN - SCOPUS:85070548402

SN - 2352-8478

VL - 5

SP - 583

EP - 589

JO - Journal of Materiomics

JF - Journal of Materiomics

IS - 4

ER -

Balancing the anionic framework polarity for enhanced thermoelectric performance in YbMg₂Sb₂ Zintl compounds

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this