Higher thermoelectric performance of Zintl phases (Eu 0.5 Yb 0.5 ) 1−x Ca x Mg 2 Bi 2 by band engineering and strain fluctuation

Shuai, Jing; Geng, Huiyuan; Lan, Yucheng; Zhu, Zhuan; Wang, Chao; Liu, Zihang; Bao, Jiming; Chu, Ching-Wu; Sui, Jiehe; Ren, Zhifeng

doi:10.1073/pnas.1608794113

Higher thermoelectric performance of Zintl phases (Eu _0.5 Yb _0.5 ) _1−x Ca _x Mg ₂ Bi ₂ by band engineering and strain fluctuation

Journal Article · Wed Jul 06 00:00:00 EDT 2016 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1608794113· OSTI ID:1260848

Shuai, Jing ^[1]; Geng, Huiyuan ^[2]; Lan, Yucheng ^[3]; Zhu, Zhuan ^[4]; Wang, Chao ^[5]; Liu, Zihang ^[6]; Bao, Jiming ^[4]; Chu, Ching-Wu ^[7]; Sui, Jiehe ^[2]; Ren, Zhifeng ^[1]

Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204,
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China,
Department of Physics and Engineering Physics, Morgan State University, Baltimore, MD 21251,
Department of Mechanical Engineering, University of Houston, Houston, TX 77204,
State Key Lab of Electronic Thin Film and Integrated Device, University of Electric Science and Technology of China, Chengdu 611731, China,
Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204,, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China,
Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204,, Lawrence Berkeley National Laboratory, Berkeley, CA 94720

Significance

The search for high-efficiency thermoelectric materials encompasses many classes of semiconductors. Zintl phases are attractive thermoelectric materials for thermoelectric applications. Here, we report the high thermoelectric performance of the rarely studied bismuth (Bi)-based Zintl phases (Eu _0.5 Yb _0.5 ) _1−x Ca _x Mg ₂ Bi ₂ with the record figure-of-merit ZT as high as 1.3 at 873 K. This ZT value is, to our knowledge, the highest ever reported in CaAl ₂ Si ₂ -based structures, especially compared with the best antimony (Sb)-based YbZn _0.4 Cd _1.6 Sb ₂ compound. Because Sb-based Zintl compounds have been studied for many decades, this Bi-based Zintl phase with high thermoelectric properties could be a good thermoelectric material candidate in the future.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0010831

OSTI ID:: 1260848

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 29 Vol. 113; ISSN 0027-8424

Publisher:: Proceedings of the National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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