Dresden 2020 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session I

MM 18.8: Poster

Monday, March 16, 2020, 18:15–20:00, P4

Glass Dynamics and Crystallization Kinetics of the System GeSe:GeTe — •Maximilian Müller, Julian Pries, and Matthias Wuttig — I. Institute of Physics (IA), RWTH Aachen University, Aachen, 52074, Germany

To optimize the application potential of phase-change materials (PCM) as random access memory switching speed from amorphous to crystalline phase has to be minimized. For a better understanding of the crystallization process of different materials it is important to clarify if crystallization occurs from the undercooled liquid phase or from a glassy phase and would be thereby depending on aging processes.

Because the glass transition of most phase change materials can not be observed in standard differential scanning calorimetric (DSC) measurements, a system of GeSe:GeTe was used to trace the stoichiometry dependence of glass transition from GeSe (non-PCM) for which glass transition is observable to GeTe (PCM) for which it is not. Additionally, ultra-fast DSC and standard DSC were used to explore the interplay of the glass transition and crystallization for heating rates in a range of more than 6 orders of magnitude.

From these data a lower boundary of the glass transition temperature of GeTe could be determined for a wide range of heating rates, especially for the standard glass transition heating rate of 20 K/min. The resulting dataset is also a promising starting point for further studies of glass dynamics and crystallization kinetics of GeTe.