Attaining reduced lattice thermal conductivity and enhanced electrical conductivity in as-sintered pure n-type Bi2Te3 alloy
Article
Article Title | Attaining reduced lattice thermal conductivity and enhanced electrical conductivity in as-sintered pure n-type Bi2Te3 alloy |
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ERA Journal ID | 4930 |
Article Category | Article |
Authors | Wang, Xiao-yu (Author), Wang, Hui-juan (Author), Xiang, Bo (Author), Shang, Hong-jing (Author), Zhu, Bin (Author), Yu, Yuan (Author), Jin, Hui (Author), Zhao, Run-fei (Author), Huang, Zhong-yue (Author), Liu, Lan-jun (Author), Zu, Fang-qiu (Author) and Chen, Zhi-gang (Author) |
Journal Title | Journal of Materials Science |
Journal Citation | 54, pp. 4788-4797 |
Number of Pages | 10 |
Year | 2019 |
Place of Publication | New York |
ISSN | 0022-2461 |
1573-4803 | |
Digital Object Identifier (DOI) | https://doi.org/10.1007/s10853-018-3172-9 |
Web Address (URL) | https://link.springer.com/article/10.1007%2Fs10853-018-3172-9 |
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. |
Keywords | conductivity; liquid state manipulation; electrical conductivity |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Hefei University of Technology, China |
University of Science and Technology of China, Hefei, China | |
Anhui Key Laboratory of Advanced Functional Materials and Devices, China | |
Chinese Academy of Sciences, China | |
University of Queensland | |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) |
https://research.usq.edu.au/item/q5267/attaining-reduced-lattice-thermal-conductivity-and-enhanced-electrical-conductivity-in-as-sintered-pure-n-type-bi2te3-alloy
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