Abstract
The experimental data available on oxygen self-diffusion coefficients D ∗ in UO 2±x have been summarized. Their dependence on temperature and stoichiometry was described by a simple theoretical approach. The oxygen self-diffusion coefficients D ∗ (x, T) in UO 2+x were converted into oxygen chemical diffusion coefficients D(x, T) , using a thermodynamic relation which was derived from Darken's equation. The oxygen potentials of UO 2+x appearing in the thermodynamic relation between D ∗ and D have been calculated from existing Δ G O 2 - models . The calculated D values show good agreement with the few measured oxygen chemical diffusion coefficients in UO 2+x .
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