Study on anisotropy of n-type Mg3Sb2-based thermoelectric materials

Song, Shaowei; Mao, Jun; Shuai, Jing; Zhu, Hangtian; Ren, Zhensong; Saparamadu, Udara; Tang, Zhongjia; Wang, Bo; Ren, Zhifeng

doi:10.1063/1.5000053

Study on anisotropy of n-type Mg₃Sb₂-based thermoelectric materials

Journal Article · Mon Feb 26 23:00:00 EST 2018 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5000053· OSTI ID:1540123

Song, Shaowei ^[1]; Mao, Jun ^[2]; Shuai, Jing ^[2]; Zhu, Hangtian ^[2]; ^[2]; Saparamadu, Udara ^[2]; Tang, Zhongjia ^[2]; Wang, Bo ^[3]; Ren, Zhifeng ^[2]

Xihua Univ., Chengdu (China); Univ. of Houston, Houston, TX (United States); DOE/OSTI
Univ. of Houston, Houston, TX (United States)
Xihua Univ., Chengdu (China)

The recent discovery of a high thermoelectric figure of merit (ZT) in an n-type Mg₃Sb₂-based Zintl phase triggered an intense research effort to pursue even higher ZT. Based on our previous report on Mg_3.1Nb_0.1Sb_1.5Bi_0.49Te_0.01, we report here that partial texturing in the (001) plane is achieved by double hot pressing, which is further confirmed by the rocking curves of the (002) plane. The textured samples of Mg_3.1Nb_0.1Sb_1.5Bi_0.49Te_0.01 show a much better average performance in the (00l) plane. Hall mobility is significantly improved to ~105 cm² V^-1 s^-1 at room temperature in the (00l) plane due to texturing, resulting in higher electrical conductivity, a higher power factor of ~18 μW cm^-1K^-2 at room temperature, and also higher average ZT. This work shows that texturing is good for higher thermoelectric performance, suggesting that single crystals of n-type Mg₃Sb₂-based Zintl compounds are worth pursuing.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0010831

OSTI ID:: 1540123

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 9 Vol. 112; ISSN 0003-6951

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

Country of Publication:: United States

Language:: English

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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
Achieving high room-temperature thermoelectric performance in cubic AgCuTe Jiang, Jing; Zhu, Hangtian; Niu, Yi Journal of Materials Chemistry A, Vol. 8, Issue 9 https://doi.org/10.1039/c9ta12954e	journal	January 2020

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