Acoustic and dielectric relaxation in ferroelectrics with diffuse phase transition

Abstract
The data on the dielectric and acoustic relaxation in the ferroelectrics with the diffuse phase transition (relaxors) are discussed. It is shown that behavior of the considered compounds (mainly the lead magnesium niobate) in the different regimes of applying of the external electric field indicates the analogy with the behavior of the definite compositions of KTaO3:Li. Such analogy corresponds to the likeness of the low-temperature phase nature of the discussed materials.