Abstract
Kinetics of the oxygen-to-metal ratio change in (U 0.8Pu 0.2)O 2− x and (U 0.7Pu 0.3)O 2− x was evaluated in the temperature range of 1523–1623 K using a thermo-gravimetric technique. The oxygen chemical diffusion coefficients were decided as a function of temperature from the kinetics of the reduction process under a hypo-stoichiometric composition. The diffusion coefficient of (U 0.7Pu 0.3)O 2− x was smaller than that of (U 0.8Pu 0.2)O 2− x . No strong dependence was observed for the diffusion coefficient on the O/M variation of samples.
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