Ultrafast diffusion of overpressurized gas filled nanobubbles in UO2

[Display omitted] Molecular dynamics modeling of diffusion of xenon nanobubbles in UO2 is carried out in this work in a wide range of gas concentrations. For small overpressurized nanobubbles emitted interstitials gather in a cluster near the bubble that significantly accelerates bubble diffusion an...

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Bibliographic Details
Published in:Journal of nuclear materials 2021-08, Vol.551, p.1, Article 152942
Main Authors: Antropov, Alexander, Stegailov, Vladimir
Format: Article
Language:English
Subjects:
Bubbles
Diffusion
Gas concentration
Interstitials
Molecular dynamics
Molecular dynamics simulation
Uranium dioxide
Xenon
Online Access:Get full text
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Summary:[Display omitted] Molecular dynamics modeling of diffusion of xenon nanobubbles in UO2 is carried out in this work in a wide range of gas concentrations. For small overpressurized nanobubbles emitted interstitials gather in a cluster near the bubble that significantly accelerates bubble diffusion and lowers its activation energy. This new diffusion mechanism could be a way towards an explanation of contradictory data for UO2 on bubble diffusivity and fission gas release rate.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2021.152942