Publikationen

Beam-induced atomic motion in alkali borate glasses

Autor(en)
Katharina Holzweber, Christoph Tietz, Tobias Michael Fritz, Michael Leitner, Bogdan Sepiol
Abstrakt

Applying coherent x rays using the method of atomic-scale x-ray photon correlation spectroscopy results in beam-induced dynamics in a number of oxide glasses. Here these studies are extended to rubidium and cesium borates with varying alkali contents. While no effect due to cumulative beam damage is observed, the observed rate of structural rearrangements shows a linear relation to the instantaneous dose rate. In agreement with the increasing glass transition temperature, the rate of dynamics at a given dose rate decreases with increasing alkali content, while the shape of the decay of correlations becomes progressively stretched. This behavior is explained in terms of faster dynamics of the alkali positions compared to the borate network. Finally, the q-dependent behavior of the correlation decay rate implies that the observed dynamics proceeds via small-scale atomic displacements subject to de Gennes narrowing.

Organisation(en)
Dynamik Kondensierter Systeme
Externe Organisation(en)
Technische Universität München, Heinz Meier-Leibnitz Zentrum (MLZ), Universität Wien
Journal
Physical Review B
Band
100
Anzahl der Seiten
9
ISSN
2469-9950
DOI
https://doi.org/10.1103/PhysRevB.100.214305
Publikationsdatum
12-2019
Peer-reviewed
Ja
ÖFOS 2012
Experimentalphysik, Festkörperphysik, Kondensierte Materie
Schlagwörter
ASJC Scopus Sachgebiete
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/beaminduced-atomic-motion-in-alkali-borate-glasses(65901d14-1bef-4734-a261-a66327c81002).html