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Article Dans Une Revue Condensed Matter Physics Année : 2019

X-rays induced atomic dynamics in a lithium-borate glass

Résumé

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.
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Dates et versions

hal-02412938 , version 1 (10-12-2020)

Identifiants

Citer

F. Dallari, G. Pintori, G. Baldi, A. Martinelli, Beatrice Ruta, et al.. X-rays induced atomic dynamics in a lithium-borate glass. Condensed Matter Physics, 2019, 22 (4), pp.43606. ⟨10.5488/CMP.22.43606⟩. ⟨hal-02412938⟩
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