Real-time observation of the thermally-induced phase transformation in GeTe and its thermal expansion properties
Article
Article Title | Real-time observation of the thermally-induced phase transformation in GeTe and its thermal expansion properties |
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ERA Journal ID | 4742 |
Article Category | Article |
Authors | Tran, Xuan Quy (Author), Hong, Min (Author), Maeno, Hiroshi (Author), Kawami, Youichirou (Author), Toriyama, Takaaki (Author), Jack, Kevin (Author), Chen, Zhi-Gang (Author), Zou, Jin (Author), Matsumura, Syo (Author) and Dargusch, Matthew S. (Author) |
Journal Title | Acta Materialia |
Journal Citation | 165, pp. 327-335 |
Number of Pages | 9 |
Year | 2019 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 1359-6454 |
1873-2453 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.actamat.2018.11.059 |
Abstract | The GeTe-based system has long been considered as a promising candidate system for various functional applications; many of which are directly related to the polymorphic phase transformation in their crystalline forms. Consequently, the microstructure underlying their intriguing phase transition has been the subject of numerous studies. Here we provide real-time observation of the microstructural changes associated with the reversible pseudo-cubic (or rhombohedral) to cubic GeTe phase transition using high-voltage transmission electron microscopy (HV-TEM) operating at 1,250 kV and complementary high-temperature X-ray diffraction (XRD). As a result of the phase transition, the pseudo-cubic GeTe domain's configuration significantly changes from its original band-like to a spike-like morphology with a different orientation after a heating/cooling cycle. The coefficients of thermal expansion (CTE) properties as a function of temperature are also explored in relation to the GeTe phase transition. |
Keywords | GeTe, in-situ high voltage transmission electron microscopy, thermal expansion tensor, CTE ellipsoids, ferroelectric domains |
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 |
Centre for Future Materials | |
Kyushu University, Japan | |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) |
https://research.usq.edu.au/item/q5269/real-time-observation-of-the-thermally-induced-phase-transformation-in-gete-and-its-thermal-expansion-properties
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