On the theory of spinodal decomposition in solid and liquid binary mixtures

摘要: The kinetics of phase separation is discussed with emphasis on the transition between spinodal decomposition and nucleation. A reanalysis theory Langer, Baron Miller shows that it exhibits a line somewhat closer to coexistence curve than meanfield spinodal. There same (as we think unphysical) critical singularities occur as in Cahn-Hilliard theory. precise location this depends cell size coarse graining. For concentrations less one structure factorS(k, t) converges then towards factor metastable onephase state, implying an infinite lifetime latter. In order include effects nucleation growth hence present alternative treatment, extending our previous work cluster dynamics. From simple approximation for radial concentration distribution function clustersS(k, computed numerically. Even at rather low time evolution ofS(k, similar what Langer et al. find high concentrations, very gradual from decomposition, least parameter values appropriate Ising model. This which consistent Lifshitz-Slyozov's coarsening law late times, extended early stages liquid mixtures.