Oxygen self-diffusion in near stoichiometric (U,Pu)O2 at high temperatures of 1673-1873 K

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The oxygen self-diffusion coefficients in near stoichiometric (U,Pu)O2 at high temperatures were successfully measured by thermogravimetry combined with the oxygen isotope exchange method. The activation energy for oxygen diffusion in the stoichiometric composition of (U,Pu)O2 was evaluated from experimental data, and the value was determined to be 248 kJ/mol. In addition, the defect migration energies of (U,Pu)O2±x were derived, and the oxygen self-diffusion coefficients were evaluated using these. As a result, good agreement was found between the experimental data and the oxygen self-diffusion coefficients calculated using the defect migration energies.