Thermoelectric properties of Zintl compound Ca1-xNaxMg2Bi1.98

Shuai, Jing; Kim, Hee Seok; Liu, Zihang; He, Ran; Sui, Jiehe; Ren, Zhifeng

doi:10.1063/1.4948651

Title: Thermoelectric properties of Zintl compound Ca_1-xNa_xMg₂Bi_1.98

Journal Article · Tue May 03 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4948651· OSTI ID:1471077

Shuai, Jing ^[1]; Kim, Hee Seok ^[1]; Liu, Zihang ^[2]; He, Ran ^[1]; Sui, Jiehe ^[3]; Ren, Zhifeng ^[1]

Univ. of Houston, Houston, TX (United States). Dept. of Physics and TcSUH
Univ. of Houston, Houston, TX (United States). Dept. of Physics and TcSUH; Harbin Inst. of Technology, Harbin, Heilongjiang (China). National Key Lab. for Precision Hot Processing of Metals and School of Materials Science and Engineering
Harbin Inst. of Technology, Harbin, Heilongjiang (China). National Key Lab. for Precision Hot Processing of Metals and School of Materials Science and Engineering

Motivated by good thermoelectric performance of Bi-based Zintl compounds Ca_1-xYb_xMg₂Bi_y, we further studied the thermoelectric properties of Zintl compound CaMg₂Bi_1.98 by doping Na into Ca as Ca_1-xNa_xMg₂Bi_1.98 via mechanical alloying and hot pressing. We found that the electrical conductivity, Seebeck coefficient, power factor, and carrier concentration can be effectively adjusted by tuning the Na concentration. Transport measurement and calculations revealed that an optimal doping of 0.5 at.% Na achieved better average ZT and efficiency. The enhancement in thermoelectric performance is attributed to the increased carrier concentration and power factor. Finally, the low cost and nontoxicity of Ca_1-xNa_xMg₂Bi_1.98 makes it a potentially promising thermoelectric material for power generation in the mid-temperature range.

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Research Organization:: Univ. of Houston, TX (United States)

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

Grant/Contract Number:: SC0010831; FG02-13ER46917

OSTI ID:: 1471077

Alternate ID(s):: OSTI ID: 1250586

Journal Information:: Applied Physics Letters, Vol. 108, Issue 18; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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Insights into the design of thermoelectric Mg3Sb2 and its analogs by combining theory and experiment Zhang, Jiawei; Song, Lirong; Iversen, Bo Brummerstedt npj Computational Materials, Vol. 5, Issue 1 https://doi.org/10.1038/s41524-019-0215-y	journal	July 2019
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Achieving high-performance p-type SmMg ₂ Bi ₂ thermoelectric materials through band engineering and alloying effects Saparamadu, Udara; Tan, Xiaojian; Sun, Jifeng Journal of Materials Chemistry A, Vol. 8, Issue 31 https://doi.org/10.1039/c9ta13224d	journal	January 2020
High Power Factor vs. High zT—A Review of Thermoelectric Materials for High-Temperature Application Wolf, Mario; Hinterding, Richard; Feldhoff, Armin Entropy, Vol. 21, Issue 11 https://doi.org/10.3390/e21111058	journal	October 2019

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