The application of amorphous chalcogenide alloys as phase change materials in data-storage media rests on their ability to undergo an extremely fast (10-100 ns) crystallization upon heating. What makes these materials so special in this respect is, however, still a matter of debate. By means of large scale molecular dynamics simulations, we demonstrate that the phase change compound GeTe shows a high atomic mobility in the amorphous phase overheated just above the glass transition temperature. This behavior leads to a breakdown of the Stokes-Einstein relation between the selfdiffusion coefficient and the viscosity which is one of the keys to understand the fast crystallization of materials in this class.

Sosso, G., Behler, J., Bernasconi, M. (2013). Atomic mobility and fast crystallization of the phase change compound GeTe. In Abstract Book.

Atomic mobility and fast crystallization of the phase change compound GeTe

BERNASCONI, MARCO
2013

Abstract

The application of amorphous chalcogenide alloys as phase change materials in data-storage media rests on their ability to undergo an extremely fast (10-100 ns) crystallization upon heating. What makes these materials so special in this respect is, however, still a matter of debate. By means of large scale molecular dynamics simulations, we demonstrate that the phase change compound GeTe shows a high atomic mobility in the amorphous phase overheated just above the glass transition temperature. This behavior leads to a breakdown of the Stokes-Einstein relation between the selfdiffusion coefficient and the viscosity which is one of the keys to understand the fast crystallization of materials in this class.
abstract + slide
phase change materials, molecular dynamics simulations, crystallization
English
European\Phase Change and Ovonics Symposium 2013
2013
Abstract Book
2013
none
Sosso, G., Behler, J., Bernasconi, M. (2013). Atomic mobility and fast crystallization of the phase change compound GeTe. In Abstract Book.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/50213
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