TITLE

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

AUTHOR(S)
Cheng, Y. Q.; Xu, M.; Sheng, H. W.; Meng, Y.; Han, X. D.; Ma, E.
PUB. DATE
September 2009
SOURCE
Applied Physics Letters;9/28/2009, Vol. 95 Issue 13, p131904
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
44449128

 

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