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Title: Study on anisotropy of n-type Mg 3Sb 2-based thermoelectric materials

Abstract

The recent discovery of a high thermoelectric figure of merit (ZT) in an n-type Mg 3Sb 2-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 cm 2 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 Mg 3Sb 2-based Zintl compounds are worth pursuing.

Authors:
 [1];  [2];  [2];  [2]; ORCiD logo [2];  [2];  [2];  [3];  [2]
  1. Xihua Univ., Chengdu (China); Univ. of Houston, Houston, TX (United States)
  2. Univ. of Houston, Houston, TX (United States)
  3. Xihua Univ., Chengdu (China)
Publication Date:
Research Org.:
Univ. of Houston, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1540123
Grant/Contract Number:  
SC0010831
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 9; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Physics

Citation Formats

Song, Shaowei, Mao, Jun, Shuai, Jing, Zhu, Hangtian, Ren, Zhensong, Saparamadu, Udara, Tang, Zhongjia, Wang, Bo, and Ren, Zhifeng. Study on anisotropy of n-type Mg3Sb2-based thermoelectric materials. United States: N. p., 2018. Web. doi:10.1063/1.5000053.
Song, Shaowei, Mao, Jun, Shuai, Jing, Zhu, Hangtian, Ren, Zhensong, Saparamadu, Udara, Tang, Zhongjia, Wang, Bo, & Ren, Zhifeng. Study on anisotropy of n-type Mg3Sb2-based thermoelectric materials. United States. doi:10.1063/1.5000053.
Song, Shaowei, Mao, Jun, Shuai, Jing, Zhu, Hangtian, Ren, Zhensong, Saparamadu, Udara, Tang, Zhongjia, Wang, Bo, and Ren, Zhifeng. Tue . "Study on anisotropy of n-type Mg3Sb2-based thermoelectric materials". United States. doi:10.1063/1.5000053. https://www.osti.gov/servlets/purl/1540123.
@article{osti_1540123,
title = {Study on anisotropy of n-type Mg3Sb2-based thermoelectric materials},
author = {Song, Shaowei and Mao, Jun and Shuai, Jing and Zhu, Hangtian and Ren, Zhensong and Saparamadu, Udara and Tang, Zhongjia and Wang, Bo and Ren, Zhifeng},
abstractNote = {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 Mg3.1Nb0.1Sb1.5Bi0.49Te0.01, 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 Mg3.1Nb0.1Sb1.5Bi0.49Te0.01 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.},
doi = {10.1063/1.5000053},
journal = {Applied Physics Letters},
number = 9,
volume = 112,
place = {United States},
year = {2018},
month = {2}
}

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