Peculiarities of dielectric properties of some compositions of PZT-based ferroceramics

In PZT-based (Ti/Zr approximate to 0.94) ferroceramics compositions the add itional 'low-temperature' anomalies on the temperature dependences of the c omplex dielectric permittivity epsilon(ef)*(T) have been found under interm ediate and strong ac-fields of low and infralow frequencies. The temperatur e hysteresis of epsilon(ef)*(T) has been found in the region of the 'low-te mperature' maximum of epsilon(ef)*(T) It is supposed that two phase transit ions take place for investigated compositions. The 'low-temperature' phase transition is held with changing of the concentration ratio of two polar ph ases. So it was analysed the influence of concentrations of some components of ferroceramics on the dielectric properties and on the situation of the morphotropic phase boundary. (C) 1999 Elsevier Science Limited. All rights reserved.