Chemical thermodynamic analysis of americium-containing UO2 and (U,Pu)O2

Oxygen potentials of americium-containing UO2 and (U,Pu)O2 were analyzed and represented with the chemical thermodynamic model proposed by Lindemer et al. New mass parameters were decided, considering valence states of pentavalent U and trivalent Am in the oxides; i.e., [Am2/3O] or [Am2O3] and [Am4/3U4/3O16/3]. Interactions and elemental compositions for the mass parameters were optimized for better representation of the experimental data. Thermodynamic parameters were also obtained thorough the present analyses. Finally, the experimental data were successfully represented by the present model.