To the theory of phase transition of a binary solution into an inhomogeneous phase

In the framework of the theoretical model of the phase transition of binary solutions into spatially inhomogeneous states proposed earlier by the autors [1], which takes into account nonlinear effects, the role of the cubic in concentration term in the expansion of free energy was studied. It is shown that taking into account the cubic term contributions to the stabilization of a homogeneous state. The existence of two inhomogeneous phases in an isotropic medium, considered in [1], proves to be possible only at half the concentration of the solution. The contribution of inhomogeneity effects to thermodynamic quantities is calculated. Phase transitions from a homogeneous state and between inhomogeneous phases are second-order phase transitions.