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Determination of the anisotropic elastic properties of rocksalt Ge2Sb2Te5 by XRD, residual stress, and DFT

Cecchini, Raimondo; Kohary, Krisztian; Fern�ndez, Asunci�n; Cabibbo, Marcello; Marmier, Arnaud

Determination of the anisotropic elastic properties of rocksalt Ge2Sb2Te5 by XRD, residual stress, and DFT Thumbnail


Authors

Raimondo Cecchini

Krisztian Kohary

Asunci�n Fern�ndez

Marcello Cabibbo

Arnaud Marmier Arnaud.Marmier@uwe.ac.uk
Senior Lecturer in Mechanical Engineering



Abstract

© 2016 American Chemical Society. The chalcogenide material Ge2Sb2Te5 is the prototype phase-change material, with widespread applications for optical media and random access memory. However, the full set of its independent elastic properties has not yet been published. In this study, we determine the elastic constants of the rocksalt Ge2Sb2Te5, experimentally by X-ray diffraction (XRD) and residual stress and computationally by density functional theory (DFT). The stiffnesses (XRD-stress/DFT) in GPa are C11 = 41/58, C12 = 7/8, and C44 = 8/12, and the Zener ratio is 0.46/0.48. These values are important to understand the effect of elastic distortions and nonmelting processes on the performances of increasingly small phase change data bits.

Citation

Cecchini, R., Kohary, K., Fernández, A., Cabibbo, M., & Marmier, A. (2016). Determination of the anisotropic elastic properties of rocksalt Ge2Sb2Te5 by XRD, residual stress, and DFT. Journal of Physical Chemistry C, 120(10), 5624-5629. https://doi.org/10.1021/acs.jpcc.5b09867

Journal Article Type Article
Acceptance Date Feb 16, 2016
Online Publication Date Feb 16, 2016
Publication Date Mar 17, 2016
Deposit Date Jun 16, 2016
Publicly Available Date Mar 29, 2024
Journal Journal of Physical Chemistry C
Print ISSN 1932-7447
Electronic ISSN 1932-7455
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 120
Issue 10
Pages 5624-5629
DOI https://doi.org/10.1021/acs.jpcc.5b09867
Keywords films, phase change, optical storage, random access memory, elasticity
Public URL https://uwe-repository.worktribe.com/output/917649
Publisher URL http://dx.doi.org/10.1021/acs.jpcc.5b09867

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