Pipe diffusion at dislocations in UO2

Murphy, Samuel and Jay, Eleanor and Grimes, Robin (2014) Pipe diffusion at dislocations in UO2. Journal of Nuclear Materials, 447. pp. 143-149. ISSN 0022-3115

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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.

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Journal Article
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Journal of Nuclear Materials
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08 Apr 2019 11:35
Last Modified:
22 Nov 2022 07:18