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Journal of Materials Science
Published in: Journal of Materials Science 6/2019

04-12-2018 | Electronic materials

Attaining reduced lattice thermal conductivity and enhanced electrical conductivity in as-sintered pure n-type Bi2Te3 alloy

Authors: Xiao-yu Wang, Hui-juan Wang, Bo Xiang, Hong-jing Shang, Bin Zhu, Yuan Yu, Hui Jin, Run-fei Zhao, Zhong-yue Huang, Lan-jun Liu, Fang-qiu Zu, Zhi-gang Chen

Published in: Journal of Materials Science | Issue 6/2019

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Abstract

Undoped n-type Bi2Te3 bulks were prepared via the liquid state manipulation (LSM) with subsequent ball milling and spark plasma sintering processes. The sample with LSM obtains higher carrier concentration and larger effective mass compared with that without LSM, exhibiting favourable electrical transport properties. More importantly, a much reduced lattice thermal conductivity ~ 0.47 W m−1 K−1 (decreased by 43%) is obtained, due to the enhanced multiscale phonon scattering from hierarchical microstructures, including boundaries, nanograins and lattice dislocations. Additionally, due to the increased carrier concentration and enlarged band gap, the bipolar effect is effectively suppressed in sample BT-LSM. Consequently, zTmax ~ 0.66 is achieved in the sample with LSM at higher temperature of 475 K, almost 22% improvement compared with that of the contrast.
previous article Highly conductive two-dimensional electron gas at the interface of Al2O3/SrTiO3
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Appendix
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Metadata
Title
Attaining reduced lattice thermal conductivity and enhanced electrical conductivity in as-sintered pure n-type Bi2Te3 alloy
Authors
Xiao-yu Wang
Hui-juan Wang
Bo Xiang
Hong-jing Shang
Bin Zhu
Yuan Yu
Hui Jin
Run-fei Zhao
Zhong-yue Huang
Lan-jun Liu
Fang-qiu Zu
Zhi-gang Chen
Publication date
04-12-2018
Publisher
Springer US
Published in
Journal of Materials Science / Issue 6/2019
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-018-3172-9

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