Project A5:

Chalcogenides: Vibrational properties and the role of temperature and pressure
(since 2015)

In the current period of this project, further investigations of the bonding properties and lattice dynamics of chalcogenides and their relation to functional properties are planned based on the methods developed in the first period. Several more compositions will be in the focus of interest, and those compounds will be chosen carefully regarding to chemical relationships and microscopical criteria, where as an additional parameter pressure will be incorporated. The aim of the project is to reach a more general picture of the relation between vibrational, electronic and functional properties.




Chalcogenides: Vibrational properties and the role of temperature
(2011 - 2015)

This project is dedicated to a combined theoretical and experimental study of the vibrational and thermal properties of chalcogenide-based phase change materials. Latest investigations of the lattice dynamics of the amorphous and crystalline phases in the Ge-Sb-Te system reveal peculiarities, for the higher energy vibrational modes, that are suspected to be related to the functionality, in particular the large optical contrast between these phases. The combination of a theoretical approach with both a micro- and macroscopic experimental study of the lattice dynamics will yield an advanced model of the specific vibrational properties that characterize the amorphous and crystalline phases in phase change materials, and it will provide insight into the relation between these (functional) properties, such as resistivity and optical contrast.

Principal investigators:

Prof. Dr. rer. nat. R. Dronskowski
Institute für Anorganische Chemie
RWTH Aachen University
Phone: +49 (0)241 80 93642
E-mail: drons@HAL9000.ac.rwth-aachen.de

(since 2015)
Dr. rer. nat. habil. K. Friese
Jülich Center for Neutron Science (JCNS-2) and
Peter Grünberg Institut (PGI-4)
Forschungszentrum Jülich GmbH
Phone: +49 (0)2461 61 3826
E-mail: k.friese@fz-juelich.de

(2011 - 2015)
Prof. Dr. rer. nat. R. Hermann
Jülich Center for Neutron Science (JCNS-2) and
Peter Grünberg Institut (PGI-4)
Forschungszentrum Jülich GmbH
Phone: +49 (0)2461 61 4786
E-mail: r.hermann@fz-juelich.de

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