Pipe diffusion at dislocations in UO2

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 structure influences the rate of O2− and U4+ diffusion along the dislocation (i.e. pipe diffusion). In the r...

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Bibliographic Details
Published in:Journal of nuclear materials 2014-04, Vol.447 (1-3), p.143-149
Main Authors: Murphy, Samuel T., Jay, Eleanor E., Grimes, Robin W.
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fission nuclear power plants
Installations for energy generation and conversion: thermal and electrical energy
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Summary: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 structure influences the rate of O2− and U4+ diffusion along the dislocation (i.e. pipe diffusion). In the region immediately surrounding the dislocations there is a significant reduction in the activation energies and diffusion coefficients for O2− and U4+ diffusion, however only out to a cylindrical radius of ≈20Å from the dislocation centre. The contribution of pipe diffusion to the overall O2− and U4+ diffusion is also discussed.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2013.12.029