In-situ observation of the continuous phase transition in determining the high thermoelectric performance of polycrystalline Sn0.98Se
Article
Article Title | In-situ observation of the continuous phase transition in determining the high thermoelectric performance of polycrystalline Sn0.98Se |
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ERA Journal ID | 122857 |
Article Category | Article |
Authors | Dargusch, Matthew (Author), Shi, Xiao-Lei (Author), Tran, Xuan Quy (Author), Feng, Tianli (Author), Somidin, Flora (Author), Tan, Xin (Author), Liu, Weidi (Author), Jack, Kevin (Author), Venezuela, Jeffrey (Author), Maeno, Hiroshi (Author), Toriyama, Takaaki (Author), Matsumura, Syo (Author), Pantelides, Sokrates T. (Author) and Chen, Zhi-Gang (Author) |
Journal Title | Journal of Physical Chemistry Letters |
Journal Citation | 10 (21), pp. 6512-6517 |
Number of Pages | 6 |
Year | 2019 |
Place of Publication | Washington, United States |
ISSN | 1948-7185 |
Digital Object Identifier (DOI) | https://doi.org/10.1021/acs.jpclett.9b02818 |
Abstract | We report a comprehensive in-situ phase-change study on polycrystalline Sn0.98Se via high-temperature X-ray diffraction and in-situ high-voltage transmission electron microscopy from room temperature to 843 K. The results clearly demonstrate a continuous phase transition from Pnma to Cmcm starting from 573 to 843 K, rather than a sudden transition at 800 K. We also find that the thermal-conductivity rise at high temperature after the phase transition, as commonly seen in pristine SnSe, does not occur in Sn0.98Se, leading to a high thermoelectric figure of merit. Density functional theory calculations reveal the origin to be the suppression of bipolar thermal conduction in the Cmcm phase of Sn0.98Se due to the enlarged bandgap. This work fills the gap of in-situ characterization on polycrystalline Sn0.98Se and provides new insights into the outstanding thermoelectric performance of polycrystalline Sn0.98Se. |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Queensland |
Kyushu University, Japan | |
Vanderbilt University, United States | |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5960/in-situ-observation-of-the-continuous-phase-transition-in-determining-the-high-thermoelectric-performance-of-polycrystalline-sn0-98se
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