Thermodynamics of Rare-Metal Bearing Binaiy Substitutional Alloy Systems

A novel statistical thermodynamic approach, based on free volume theory, has recently been applied to the binary alloy systems of some important rare metals. The theoretically calculated values of properties of such solutions, obtained by making use of experimentally determined infinite dilution properties of both the components and expressions developed in this new approach, show excellent correspondence to selected empirical data of these systems over their entire range of composition. Asymmetric behaviour of several of these systems is also successfully explained. However, the general behaviour of solutes based on their fundamental characteristics cannot be predicted quantitatively in such solutions.