Reversible permittivity of multicomponent PMN-PT-based ceramics

The reversible permittivity of Ba-doped ceramics of the multicomponent system mPMN-nPNN-yPZN-xPT (m = 0.1298–0.4844, n = 0.1266–0.4326, y = 0.0842–0.130, x = 0.25–0.40) is studied. The reversible permittivities of cubic, heterophase, and tetragonal ceramics are analyzed under various experimental conditions, such as the measuring ac electric field frequency and the time of residence in a dc bias electric field. The transformation of permittivity minima into a plateau and the subsequent disappearance of all anomalies as the lead titanate concentration decreases are assumed to be related to a change in the initial domain structure of the material. A diagram illustrating the dependence of the tunability coefficient on the lead titanate concentration is plotted, and the ceramic compositions that correspond to the characteristic dependences of reversible permittivity are determined.