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Applied Physics Letters / Volume 95 / Issue 13 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 95, 131904 (2009); http://dx.doi.org/10.1063/1.3240885 (3 pages)

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

Y. Q. Cheng1, M. Xu1, H. W. Sheng2, Y. Meng3, X. D. Han4, and E. Ma1

1Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
2Department of Computational and Data Sciences, George Mason University, Fairfax, Virginia 22030, USA
3High Pressure Collaborative Access Team, Carnegie Institution of Washington, Argonne, Illinois 60439, USA
4Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, People's Republic of China

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(Received 18 August 2009; accepted 9 September 2009; published online 1 October 2009)

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.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

ab initio calculations, amorphisation, antimony compounds, bonds (chemical), chalcogenide glasses, germanium compounds, high-pressure solid-state phase transformations, phase change materials, tellurium compounds, X-ray diffraction

PACS

  • 64.70.kg

    Semiconductors

  • 62.50.-p

    High-pressure effects in solids and liquids

  • 61.50.Lt

    Crystal binding; cohesive energy

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3240885

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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