Ferroelectrics in the para phase in a homogeneous,intense vhf field

Conclusion Investigation of the behavior of ferroelectrics in an intense variable electric field has revealed a number of significant features. The choice of models explaining the observed effects requires that the interaction between the electric field and the acoustic vibrations of the crystal lattice of the material be taken into account, demonstrates the role of static charged defects, and reveals features of charge-carrier kinetics.The main interest centers on investigations in the vhf range, which is distinguished by high information content. Here, primarily, the small wavelength of the acoustic vibrations ( l m) at frequencies of the intense excitation comparable with the film thickness and the crystallite size must be noted, together with the small duration of the vibration period, comparable with the charge-carrier relaxation time.The next problem is the creation of a model combining both the nonlinear effects and the charge-carrier kinetics determining the redistribution of the static internal field and the charge transfer. The development of such a model will have a decisive influence in improving the characteristics of ferroelectric devices.The development of microscopic models explaining the noted features of the ferroelectric properties is also very urgent. One of the interesting trends in this field is the use of the interband theory of ferroelectricity.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 59–80, August, 1981.