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Pipe diffusion at dislocations in UO2

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<mark>Journal publication date</mark>2014
<mark>Journal</mark>Journal of Nuclear Materials
Volume447
Number of pages7
Pages (from-to)143-149
Publication StatusPublished
<mark>Original language</mark>English

Abstract

We present the results of a combination of static and dynamic simulations employing empirical potentials, investigating the structures of dislocations in UO2 and show how the dislocation core structureinfluences the rate of O2- and U4+ diffusion along the dislocation (i.e. pipe diffusion). In the region imme-diately surrounding the dislocations there is a significant reduction in the activation energies and diffu-sion coefficients for O2- and U4+ diffusion, however only out to a cylindrical radius of 20 Å from thedislocation centre. The contribution of pipe diffusion to the overall O2- and U4+ diffusion is also discussed.