Condensed Matter Physics, 2019, vol. 22, No. 4, 43606
DOI:10.5488/CMP.22.43606
arXiv:1912.01943
Title:
X-rays induced atomic dynamics in a lithium-borate glass
Author(s):
 
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F. Dallari
(University of Trento, Department of Physics, Via Sommarive, 14, 38123 Povo (TN), Italy; Deutsches Elektronen-Synchrotron (DESY), Notkestraße, 85, 22607 Hamburg, Germany)
,
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G. Pintori
(University of Trento, Department of Physics, Via Sommarive, 14, 38123 Povo (TN), Italy; University of Trento, Department of Industrial Engineering, Via Sommarive, 9, 38123 Trento, Italy)
,
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G. Baldi
(University of Trento, Department of Physics, Via Sommarive, 14, 38123 Povo (TN), Italy)
,
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A. Martinelli
(University of Trento, Department of Physics, Via Sommarive, 14, 38123 Povo (TN), Italy)
,
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B. Ruta
(ESRF-European Synchrotron Radiation Faculty, 38043 Grenoble, France; Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France)
,
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M. Sprung
(Deutsches Elektronen-Synchrotron (DESY), Notkestraße, 85, 22607 Hamburg, Germany)
,
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G. Monaco
(University of Trento, Department of Physics, Via Sommarive, 14, 38123 Povo (TN), Italy)
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The continuous development of synchrotron-based experimental techniques in the X-ray range provides new possibilities to probe the structure and the dynamics of bulk materials
down to inter-atomic distances. However, the interaction of intense X-ray beams with matter can also induce changes in the structure and dynamics of materials. A reversible and
non-destructive beam induced dynamics has recently been observed in X-ray photon correlation spectroscopy experiments in some oxide glasses at sufficiently low absorbed doses,
and is here investigated in a (Li2O)0.5(B2O3)0.5 glass. The characteristic time of this induced dynamics is inversely proportional to the
intensity of the X-ray beam, with a coefficient that depends on the chemical composition and local structure of the probed glass, making it a potentially new tool to investigate
fundamental properties of a large class of disordered systems. While the exact mechanisms behind this phenomenon are yet to be elucidated, we report here on the measurement of the
exchanged wave-vector (and thus length-scale) dependence of the characteristic time of this induced dynamics, and show that it follows the same power-law observed in vitreous silica.
This supports the idea that a unique explanation for this effect in different oxide glasses should be looked for.
Key words:
glasses, glass transition, X-ray photon correlation spectroscopy, coherent X-ray scattering
PACS:
61.05.cf, 61.43.Fs, 61.80.Cb
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