Probing the dynamics of B2O3 across the glass transition: an X-ray photon correlation spectroscopy study

X-ray photon correlation spectroscopy is used to study the dynamics of the glass former across the glass transition temperature, . The obtained data confirm that while the structural relaxation drives the density rearrangements in the liquid phase, a beam-induced dynamics is the dominant effect arou...

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Bibliographic Details
Published in:Philosophical magazine (Abingdon, England) England), 2020-10, Vol.100 (20), p.2636-2645
Main Authors: Martinelli, A., Baldi, G., Dallari, F., Rufflé, B., Zontone, F., Monaco, G.
Format: Article
Language:English
Subjects:
beam-induced dynamics
Condensed Matter
Glass transition
Materials Science
oxide glasses
Physics
synchrotron radiation
X-ray photon correlation spectroscopy
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Summary:X-ray photon correlation spectroscopy is used to study the dynamics of the glass former across the glass transition temperature, . The obtained data confirm that while the structural relaxation drives the density rearrangements in the liquid phase, a beam-induced dynamics is the dominant effect around and below . The use of a hybrid photon counting detector allows us to obtain high-quality correlation functions with a characteristic decay time down to a second. The characteristic time of the induced dynamics displays a linear dependence on the inverse of the absorbed X-ray power over the whole observed range, i.e. up to powers of 0.2 eV/atom/s. Up to these values, then, an X-ray irradiated glass sample explores structurally equivalent configurations on a timescale dictated by the absorbed power.
ISSN:1478-6435
1478-6443
1478-6433
DOI:10.1080/14786435.2020.1757172