A body-centered-cubic polymorph of the Ge2Sb2 Te 5 phase change alloy

Y. Q. Cheng; M. Xu; H. W. Sheng; Y. Meng; X. D. Han; E. Ma

doi:10.1063/1.3240885

A body-centered-cubic polymorph of the Ge₂Sb₂ Te ₅ phase change alloy

Y. Q. Cheng, M. Xu, H. W. Sheng, Y. Meng, X. D. Han, E. Ma

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

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.

Original language	English
Article number	131904
Journal	Applied Physics Letters
Volume	95
Issue number	13
DOIs	https://doi.org/10.1063/1.3240885
State	Published - 2009
Externally published	Yes

Funding

This work was supported by U.S. DOE-BES under Contract No. DE-FG02-09ER46056. Experiment work of this study was performed at HPCAT (Sector 16IDB), APS, Argonne National Laboratory. HPCAT is supported by DOE-BES, DOE-NNSA, NSF, and the W. M. Keck Foundation. APS is supported by DOE-BES, under Contract No. DE-AC02-06CH11357.

Funders	Funder number
DOE-BES
DOE-NNSA
U.S. DOE-BES	DE-FG02-09ER46056
National Science Foundation
W. M. Keck Foundation	DE-AC02-06CH11357

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AU - Ma, E.

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A body-centered-cubic polymorph of the Ge₂Sb₂ Te ₅ phase change alloy

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