Abstract
The increase in weight of uranium dioxide with time in the presence of 6–7 torr of oxygen at 66°C and 80°C was measured with a recording microbalance. At 80°C the composition of the uranium oxide was UO 2·33 after 2650 hr. At 66°C the composition reached UO 2·28 after 7400 hr. The kinetics of oxidation were described approximately by an equation for diffusion of O atoms into UO 2 spheres with diffusion coefficients of 4 × 10 −19 cm 2/sec at 66°C and 1·5 × 10 −8 cm 2/sec at 80°C. The coefficients are close to the values obtained by extrapolation from published data.
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