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.
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