RELAXATION EFFECTS IN PEROVSKITE FERROELECTRIC CERAMICS WITH SMEARED PHASE-TRANSITION

In solid solutions with a perovskite structure PbZrO3-K0.5Bi0.5TiO3 an d PbZrO3-PbTiO3 the behaviours of low-frequency internal friction, die lectric permittivity and dielectric losses have been investigated at a change of temperature, bias electric field, as well as at isothermal annealing of samples. In structures, close to morphotropic phase trans ition, anomalous thermal hysteresis of dielectric losses, which is cha racterised by a long-term relaxation of metastable states is found out .