The earlier-suggested generalized Gibbs distribution approach to the configurational kinetics of non-equilibrium alloys is extended to the case of many-component alloys and the realistic vacancy-mediated atomic exchange mechanism is incorporated. Exact and approximate equations for the temporal evolution of atomic distributions as well as for the free energy of a non-equilibrium alloy are presented. It is shown that the evolution of the main alloy component distribution for the nearest-neighbour vacancy exchange model can usually be described in terms of an equivalent direct exchange model. This conclusion is illustrated with the computer simulation of decomposition and ordering via the vacancy exchange mechanism for a twodimensional alloy model. The simulation also reveals the localized ordering phenomenon at very early stages of ordering, in agreement with previous experiments and Monte Carlo simulation, but with no interfacial vacancy trapping which was suggested in previous works in order to explain this phenomenon.
The statistics of ferroelectrics of the KDP family is investigated on the basis of Blinc and Svetina's model. Tables and graphes for various thermodynamic quantities connected with the transition are presented which permit a comparison with the experiment and an estimation of parameters of the theory for any crystal of the family. An attempt of such a fit of parameters is made and gives a satisfactory description of all the experimental data except the differences between the Curie and Curie‐Weiss temperatures which are too small in the theory. Some trends in variations of the found parameters with composition are observed and discussed.
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