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

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

Journal Article · Tue Feb 27 00:00:00 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)
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.

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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, Vol. 112, Issue 9; ISSN 0003-6951

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

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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