Thermodynamics of binary Solutions of the eutectic type with intermediate phases of constant composition

A consistent method is proposed for calculating the phase diagrams of binary solutions with intermediate phases of constant composition. The proposed method is based on the nonlinear transformations of the concentration axes and makes it possible to correctly reduce the calculation of the phase diagrams with intermediate phases to a sequence of phase diagrams of individual subsystems. The thermodynamics of binary solutions of the eutectic type with intermediate phases of constant composition is described using the proposed method within the framework of the generalized lattice model. The results of the calculations performed are compared with a number of phase diagrams of real binary systems.