Abstract
Almost all previous calculations of the thermodynamic properties of liquid UO2 were carried out in the single substance approximation (SSA), where vapour and liquid phases have the same elemental and molecular composition (FCE mode). In this Chapter, a preliminary account for non-congruent evaporation is presented, based on a relatively simple and easy manageable van der Waals-type EOS. The main problem is here the dependence of noncongruency of vaporisation on the particle interaction parameters, in particular, on the their relative sizes. This model can be first used to describe the gas-liquid phase transition in congruently evaporating uranium dioxide, and then extended, through a more complicated numerical procedure, to evaluate the non-congruent coexistence of vapour and liquid phases. The results of these calculations are described in the following sections.
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