DIELECTRIC LOSSES AND CONDUCTIVITY OF ZR-RICH PZT

The temperature and frequency dependence of the dielectric constant an d the conductivity of Zr-rich PZT (95/5 Zr/Ti ratio) has been investig ated. In the paraelectric region (T>520 K) the effect of the conductiv ity, probably due to oxygen vacancies becomes predominant at low frequ encies. At the ferro-paraelectric transition temperature, T-FP, a stra ightforward analysis of the frequency dependence of the dielectric los ses peak allows the characterization of the intrinsic relaxation time temperature dependence in the vicinity of the transition temperature.