LAUSR

Abstract Several (U1-xPux)O2±δ powders with different morphologies and different plutonium contents were synthetized using a sol-gel route. All the powders were fully characterized to quantify their structural parameters. After understanding and verification of the morphological effects on mixed oxide dissolution, this study consists of quantification of effect of plutonium content on dissolution kinetics using nitric acid 8.5 M at 95 °C. Significant differences in dissolution kinetics were observed. Indeed, the plutonium content is a key parameter that has to be considered in studies of (U1-xPux)O2±δ dissolution kinetics. A kinetics law was established and validated for dissolutions within these particular experimental conditions.