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(a) Model for in the (distorted) fcc structure with Ge (light gray/green), Sb (dark gray/red), Te (black), and structural vacancy (white). (b) Three-dimensional representation of Young’s modulus, as calculated with GGA. The surface gives the value of the Young’s modulus for a given direction (maximum value, on-axis is 112 GPa).
Summary of elastic properties of GST124 and GST225 published in literature and in this study. For bulk modulus, “stiffness” refers to computation from elastic constants as opposed to “direct” measurement or calculation. Values in brackets are inferred by us.
Elastic constants of the seven-atom GST124 structure in GPa.
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