In this work, the process of reorientation of domains during the polarization was investigated in "pure" and Nb2O5 or Fe2O3 doped PZT ceramics through electrical current transient and ferroelectric hysteresis measurements. The experimental results enabled to identify the mechanisms responsible for the polarization and their contributions to the total polarization. The release of the polarization after removal of the dc electric field was calculated and compared with results of ageing in these ceramics. The process of domain reorientation showed to be highly influenced by the presence of impurities.
Ferroelectric domain; domain wall; polarization; current transient
