STABILITY OF MECHANICAL AND DIELECTRIC PARAMETERS IN PZT BASED CERAMICS

The (Pb0.9Ba0.1)(Zr0.53Ti0.47)O3 + 2 % mol. Nb2O5 ceramics were prepared from high purity synthesized ceramic powders by a classical sintering method. Internal friction Q-1 and Young’s modulus E were measured as a function of temperature for the sample in the initial state and after γ irradiation 5 R dose. Two internal friction peaks P1 and P2, related to oxygen vacancies and domain walls, respectively, were observed in all measurements. In addition, a minimum in modulus E associated with a phase transition internal friction peak P3 appearing at curie temperature was observed. The internal friction results indicate the changes of concentration of oxygen vacancies and the domain structure, which will be helpful in the utilities of the PZT ceramics in transducers, ultrasonic generators, wave filters, etc