Domain wall splitting and creation of the fine domain structure

摘要

The study of the movement of the paraelectric-ferroelectric interphase boundary in (Ba,Sr)TiO_3 with concentration change is provided in the framework of the mean-field theory. The analytical solution for the parameters of motion of the interphase boundary is applied to the calculations of the splitting of domain walls in (Ba,Sr)TiO_3 for different concentrations of Sr. The calculations are based on the experimental data for the Curie-Weiss constant and for the parameters of the Landau-Ginzburg expression for the free energy.