The present work considers a change in the momentum under the transfer of a solution through the interface. It is shown that pressure related to the partial volumes of the components arises as a result of the kinetics of the addition of particles to a new phase in the solution. In contrast to the description of one-dimensional interphase mass transfer using the convective diffusion problem, the proposed model provides the stationary exponential distributions of components in both phases. It is shown that generalized Fick’s law provides the condition for the conservation of the momentum of a component at the interface. The model describes component segregation by the interface.

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Here we show the results of experimental observation of decomposition of the solution components into the neighboring cells. The liquid solution under crystallization first gets into the unstable state and then decomposes. The decomposition result is fixed in the solid phase as inhomogeneous component distribution. Our experimental results enable to argue that the eutectic pattern forms due to interface instability and spinodal decomposition of non-equilibrium solution forming in front of the interface.