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Results of detailed investigations of stability of phases in substances withthe small difference in the energies of the ferroelectric and theantiferroelectric types of dipole ordering are presented. It is shown thatinteraction of locally separated domains of the ferroelectric andantiferroelectric phases stabilizes a nonuniform state of the samples. Theanalysis of physical phenomena caused by the presence of domains of coexistingferroelectric and antiferroelectric phases in different dipole orderedsubstances is presented. The consideration of peculiarities of behavior ofsystems with nonuniform state of coexisting phases under the action of changingexternal thermodynamic parameters (temperature, pressure, electric field, andchemical composition) is given.

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