Determination of the anisotropic elastic properties of rocksalt Ge2Sb2Te5 by XRD, residual stress and DFT
Journal of Physical Chemistry C
American Chemical Society
Copyright © 2016 American Chemical Society
Reason for embargo
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 non-melting processes on the performances of increasingly small phase change data bits.
We gratefully acknowledge funding from European FP6 framework program-EXCELL Project NoE 5157032, CSIC (NANO-CONTROL 201060E102), Spanish Ministry MICINN (Consolider FUNCOAT CSD2008-00023) and Junta de Andalucia (TEP217).
This is the author accepted manuscript. The final version is available from ACS via http://dx.doi.org/ 10.1021/acs.jpcc.5b09867