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Abstract
The behavior of uranium dioxide in an oxidative medium in air and a neutral medium in argon for several thousands of hours was studied. Negligible additional oxidation of pellets occurred at room temperature; this was indicated by an increase of the stoichiometric mixture ratio of uranium dioxide near the surface. The oxidation rate constant at 295 K was k = 2.77·10–7 in air and 5·10–8 g/(cm2·h) in argon. For oxidation in air at 295–503 K only solid solutions of oxygen in uranium dioxide were formed. The temperature dependence of the oxidation rate constant was determined. The threshold temperature above which higher oxides of uranium form was determined. The stoichiometric mixture ratio has no effect on the oxidation rate constant of uranium dioxide in air. 1 figure, 3 tables, 9 references.
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