Nonuniform States in Ferroelectrics and Antiferroelectrics. States with Negative Interphase Energy

Abstract: Results of detailed investigations of stability of phases in substances with the small difference in the energies of the ferroelectric and the antiferroelectric types of dipole ordering are presented. It is shown that interaction of locally separated domains of the ferroelectric and antiferroelectric phases stabilizes a nonuniform state of the samples. The analysis of physical phenomena caused by the presence of domains of coexisting ferroelectric and antiferroelectric phases in different dipole ordered substances is presented. The consideration of peculiarities of behavior of systems with nonuniform state of coexisting phases under the action of changing external thermodynamic parameters (temperature, pressure, electric field, and chemical composition) is given.