Theory of improper decay of binary solid solutions
A. Yu. Gufan, O. V. Kukin, Yu. M. Gufan · Bulletin of the Russian Academy of Sciences Physics · 2008
A phenomenological theory of improper decay of solid solutions has been developed for the first time. This theory differs from the previous versions by consideration of three- and four-particle interactions. One of possible two-dimensional cross sections of the complete phase diagram is presented, which includes all possible versions of improper decay at the one-component order parameter, describing the proper ordering that leads to decay. This cross section makes it possible to understand the dissolution of ordered nanoregions in PbMg 1/3 Nb 2/3 O 3 with a decrease in temperature.