Se-alloying reducing lattice thermal conductivity of Ge0.95Bi0.05Te
Article
Article Title | Se-alloying reducing lattice thermal conductivity of Ge0.95Bi0.05Te |
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ERA Journal ID | 4724 |
Article Category | Article |
Authors | Wang, De-Zhuang (Author), Liu, Wei-Di (Author), Shi, Xiao-Lei (Author), Gao, Han (Author), Wu, Hao (Author), Yin, Liang-Cao (Author), Zhang, Yuewen (Author), Wang, Yifeng (Author), Wu, Xueping (Author), Liu, Qingfeng (Author) and Chen, Zhi-Gang (Author) |
Journal Title | Journal of Materials Science and Technology |
Journal Citation | 106, pp. 249-256 |
Number of Pages | 8 |
Year | 2022 |
Publisher | Elsevier |
Place of Publication | China |
ISSN | 1005-0302 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.jmst.2021.08.020 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S1005030221008045 |
Abstract | High lattice thermal conductivity of intrinsic GeTe limits the wide applicaion of GeTe-based thermoelectrics. Recently, the optimization of GeTe-based thermoelectric materials has been focusing on reducing lattice thermal conductivity via strengthening phonon scattering. In this study, we systematically studied thermoelectric properties of Se-alloyed Ge0.95Bi0.05Te via theoretical calculations, structural characterizations, and performance evaluations. Our results indicate that Se-alloying can induce dense point defects with mass/radius fluctuations and correspondingly enhance point defect phonon scatteirng of the Ge0.95Bi0.05Te matrix. Se-alloying might also change chemical bonding strength to introduce resonant states in the base frequency of Ge0.95Bi0.05Te matrix, which can strengthen Umklapp phonon scattering. Finally, a decreased lattice thermal conductivity from ∼1.02 W m−1 K−1 to ∼0.65 W m−1 K−1 at 723 K is obtained in Ge0.95Bi0.05Te1-xSex pellets with increasing the Se content from 0 to 0.3. A peak figure of merit value of ∼1.6 at 723 K is achieved in Ge0.95Bi0.05Te0.7Se0.3 pellet, which is ∼77% higher than that of pristine GeTe. This study extends the understanding on the thermoelectric performance of GeTe. |
Keywords | thermoelectric; GeTe; Se-alloying; lattice thermal 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 | Nanjing Tech University, China |
Centre for Future Materials | |
Zhengzhou University, China | |
Hefei University of Technology, China | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6qxz/se-alloying-reducing-lattice-thermal-conductivity-of-ge0-95bi0-05te
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