Thermodynamic modeling of the UO2-CaO phase diagram

Abstract

A thermodynamic modeling of the UO2-CaO phase diagram was performed with experimental data available in the literature. A relatively simple approach is used to model the solution phases, which are treated as the regular and the sub-regular solutions of the end-members. A consistent set of optimized interaction parameters was derived for describing the Gibbs energy of each phase in this system leading to a good fit between calculation and experimental data. A tentative phase diagram was presented by calculating the liquidus, solidus, and solvus curves. Also, the lattice stabilities and the activities of each component were evaluated from the present thermodynamic modeling. (C) 2014 Elsevier B.V. All rights reserved.