Beam induced dynamics in oxide glasses

Christoph Tietz, Tobias Michael Fritz, Katharina Holzweber, Michael Legenstein, Bogdan Sepiol

Atomic scale X-Ray Photon Correlation Spectroscopy (aXPCS) is a powerful technique to study the dynamics on an atomic scale by using high-intensity coherent X-ray radiation. Improvements on synchrotron sources give rise to ever increasing possibilities to study materials. Concomitantly the effects of the beam on the materials under investigation are of grand importance. While most studies of beam damages focus on structural changes, aXPCS presents the unique possibility to study the effect of high-flux X-rays on the dynamics in hard condensed matter. Such effects on the dynamics is termed beam-induced dynamics (BID) and was recently found [1] for some classes of materials [2]. aXPCS is a prime candidate for investigations of beam induced dynamics. On the other side BID opens up new opportunities for aXPCS research.
In this work the results of our recent studies of beam-induced dynamics on alkali borate glasses are presented. One of the most important results is that the dynamics acceleration is directly proportional to the X-ray flux. BID is further dependent on sample thickness and depends on the irradiation history in addition to the thermal history. Moreover, the beam-induced dynamics lack a significant temperature dependence on their own and indeed give rise to structural alterations, i.e. beam damage. First results indicate that both thermally activated dynamics and BID can occur at the same time. Finally, several possible explanations for BID will be presented as well as a short outline for the future of aXPCS measurements.
This work was funded by Austrian Science Fund (FWF): P28232-N36.

[1] B. Ruta, F. Zontone, Y. Chushkin, G. Baldi, G. Pintori, G. Monaco, B. Rufflè and W. Kob, Sci. Rep., 7, (2017)
[2] M. Leitner, M. Stana, M. Ross and B. Sepiol, arXiv:1510.01918v1

Dynamik Kondensierter Systeme
Externe Organisation(en)
Universität Wien
Anzahl der Seiten
ÖFOS 2012
Experimentalphysik, Festkörperphysik, Kondensierte Materie, Materialphysik
ASJC Scopus Sachgebiete
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