Poling induced dielectric anomalies in a PZT ceramic

Dielectric properties of Pb0.99375(Zr0.52Ti0.48)0.9875Nb0.0125O3 (PZTN) ceramics were measured during heating and cooling processes before and after poling. A dielectric anomaly from 220 K to 290 K was only observed in poled PZTN samples. The frequency dependence of the ε′′ peaks was fitted using the Vogel-Fulcher law, which indicated that this dielectric anomaly could be associated with the poling induced monoclinic distortion. Meanwhile, the existence of the low-temperature transformation involving rotations of the octahedra was confirmed by the broadening peaks in ε′′-T curves and the variation of slopes in ε′-T curves in both unpoled and poled samples.