Regularities of phase equilibria in the binary uranium tetrachloride systems and their thermodynamic interpretation

• Published in: Journal of nuclear materials 1997-08, Vol.247, p.301-303
• Main Author: Gaweł, Wiesław
• Format: Article
• Language: English
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/S0022-3115(97)00078-0

The author's phase and thermodynamic studies on the binary salt systems with common anion have shown that there is a quantitative relation between the phase diagram type and the ionic potentials of component cations of the system. The relation may be clearly presented using the binary uranium tetrachloride systems MCl n − UCl 4 as an example. When all the systems whose phase diagrams are known are listed in sequence of decreasing values of the ionic potentials ratio of both component cations, a certain regularity may be observed: the phase diagram types change suddenly at some precise values of the ratio. Considering the thermodynamic characteristics of the liquid phases of some of the systems, we can observe that the dependence of the excess partial molar Gibbs energy of a component (and molar Gibbs energy of solution as well) on the cation potentials ratio, is linear within the limits of the group of systems of any definite type.