Physics – Chemical Physics
Scientific paper
2009-05-16
Journal de Physique IV 10, Pr5, 363-367 (2000)
Physics
Chemical Physics
5 pages, no figures, 2 tables, Proceedings of Int. Conf. "Strongly Coupled Coulomb Systems", Sent-Malo, France, 1999
Scientific paper
The paper presents a model for liquid uranium dioxide, obtained by improving a simplified ionic model, previously adopted to describe the equation of state of this substance [1]. A "chemical picture" is used for liquid UO2 of stoichiometric and non-stoichiometric composition. Several ionic species are considered here: U(5+), U(4+), U(3+), O(2-) and O(-). The ions are described as charged hard-spheres of different diameters. Coulomb interaction of ions is taken into account according to the modified Mean Sphere Approximation (MSA). The main result of the new model is the appearance of natural "plasma" equivalent, which, from the theory, is directly related to the definition of oxygen potential in liquid UO(2+x). The features of the model make it possible to describe non-congruent phase equilibrium (and evaporation) in uranium dioxide, as well as other relevant phenomena characterising the phase equilibrium in chemically active matter. First calculation results are discussed.
Fortov Vladimir
Gryaznov Victor
Hyland Gerard J.
Iosilevski Igor
Ronchi Claudio
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