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|Title:||Diffusion of Helium in Non-stoichiometric Uranium Dioxide|
|Authors:||YAKUB E.; RONCHI C.; STAICU Dragos|
|Citation:||JOURNAL OF NUCLEAR MATERIALS vol. 400 no. 3 p. 189-195|
|Publisher:||ELSEVIER SCIENCE BV|
|Type:||Articles in periodicals and books|
|Abstract:||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.|
|JRC Directorate:||Nuclear Safety and Security|
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