Real-time observation of the thermally-induced phase transformation in GeTe and its thermal expansion properties

Tran, Xuan Quy and Hong, Min and Maeno, Hiroshi and Kawami, Youichirou and Toriyama, Takaaki and Jack, Kevin and Chen, Zhi-Gang and Zou, Jin and Matsumura, Syo and Dargusch, Matthew S. (2019) Real-time observation of the thermally-induced phase transformation in GeTe and its thermal expansion properties. Acta Materialia, 165. pp. 327-335. ISSN 1359-6454

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.


Statistics for USQ ePrint 36052
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 04 Sep 2019 00:03
Last Modified: 10 Sep 2019 04:36
Uncontrolled Keywords: GeTe, in-situ high voltage transmission electron microscopy, thermal expansion tensor, CTE ellipsoids, ferroelectric domains
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Funding Details:
Identification Number or DOI: 10.1016/j.actamat.2018.11.059
URI: http://eprints.usq.edu.au/id/eprint/36052

Actions (login required)

View Item Archive Repository Staff Only