Abstract
Seven uranium–plutonium mixed oxides (MOX) comprising 10 and 20 mol% of solid simulated fission products (FPs) were prepared via powder metallurgy. Zirconium, neodymium, samarium, and gadolinium were selected as the FPs owing to their high fission yields and solubility within the uranium–plutonium fluorite structure. A laboratory-scale manufacturing process was developed to prepare solid solutions that are prerequisites for thermodynamical investigations. The microstructure and crystal structure of the specimens were analyzed. Furthermore, a mechanistic approach toward cation interdiffusion is proposed. Finally, our hybrid crystallographic model was employed to re-evaluate the ionic radii of the species constituting the FP-MOX samples.
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