期刊
JOURNAL OF NUCLEAR MATERIALS
卷 458, 期 -, 页码 45-55出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2014.11.120
关键词
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资金
- AWE
- EPSRC [EP/I03601X/1]
- EPSRC
- HPC resources (Aquila) at the University of Bath
- Engineering and Physical Sciences Research Council [EP/L000202/1, EP/I03601X/1] Funding Source: researchfish
- EPSRC [EP/I03601X/1, EP/L000202/1] Funding Source: UKRI
We apply atomistic simulation techniques to address whether oxygen shows higher diffusivity at the grain boundary region compared to that in bulk UO2, and whether the relative diffusivity is affected by the choice of the grain boundary. We consider coincident site lattice grain boundaries, Sigma 3, Sigma 5, Sigma 9, Sigma 11 and Sigma 19, expressing the {n n 1}, {n 1 1}, and {n 1 0} surfaces, and evaluate the extent that the grain boundary structures affect the diffusion of oxygen. We found that oxygen diffusion is enhanced at all boundaries and in the adjacent regions, with strong dependence on the temperature and local structure. Crown Copyright (C) 2014 Published by Elsevier B.V.
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