A body-centered-cubic polymorph of the Ge2Sb2Te5 phase change alloy

Cheng, Y. Q.; Xu, M.; Sheng, H. W.; Meng, Y.; Han, X. D.; Ma, E.
September 2009
Applied Physics Letters;9/28/2009, Vol. 95 Issue 13, p131904
Academic Journal
In Ge2Sb2Te5 (GST), the prototype phase-change alloy for data storage, in situ x-ray diffraction experiments reveal a pressure-induced crystalline-amorphous-crystalline transition sequence, all at the same fixed composition and in one experimental cycle. A body-centered-cubic polymorph is discovered at high pressures; the formation of this phase is attributable to its high packing density rendered possible by the switch from covalent to metallic bonding as predicted by ab initio calculations.


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