a.c. Conductivity behavior of a hot pressed [PbTiO3–PbZrO3–PbCuNbO3] ferroelectric ceramic

The temperature dependence of electric parameters of the sintered compound PbZr0.5Ti0.44(Cu1/4Nb3/4)0.06O3 + 0.5 mol% MnO2 was investigated using a.c. measurements. The temperature dependence of the a.c. conductivity in the vicinity of Tc is highly non-linear with a local maximum in conductivity observed at that temperature. The total conductivity st(w), as a function of frequency, exhibits a power law dependence (s0 + Aw s ), whose exponent s is maximized at the ferro-paraelectric transition.  2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.