Diffusion of Helium in Non-stoichiometric Uranium Dioxide
Diffusion coefficients of helium in solid UO2+x at high temperature and various stoichiometric compositions are evaluated by using molecular dynamics simulations based on a partly-ionic model in conjunction with a polaron ¿Free Hopping Approximation¿ proposed earlier. The results are compared with existing experimental and simulation data. A strong dependence of the apparent diffusion activation
energy on stoichiometry is found and the mechanisms of He migration in non-stoichiometric solid UO2+x are discussed.
YAKUB E.;
RONCHI C.;
STAICU Dragos;
2010-07-26
ELSEVIER SCIENCE BV
JRC52626
0022-3115,
www.elsevier.com/locate/jnucmat,
https://publications.jrc.ec.europa.eu/repository/handle/JRC52626,
10.1016/j.jnucmat.2010.03.002,
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