Моделирование зависимости гистерезисных кривых кристаллических сегнетоэлектриков от частоты и амплитуды управляющего поля

Description of switching processes in crystalline ferroelectrics by means of relaxation type equations with account of variable external electric field influence is proposed. The exact analytical solutions of these equations at arbitrary dependence of relaxation function on electric field and its derivative are obtained. The condition for periodicity of the solutions with respect to time is found out. Numerical analysis of the hysteresis loops shapes for case of sinusoidal controlling field is carried out. The calculations results are in qualitative agreement with experimental data.