Abstract
Effects of doping on ABO3 perovskite PZT compounds were studied. We determined effects of doping with Na ions (0.5–2.5 at.%) in A sublattice of Pb(Zr,Ti)O3 and (Pb,La)(Zr,Ti)O3 ceramics. The phase transition between ferro- and paraelectric phase was shifted, the dielectric losses decreased, and the piezoelectric coefficients, Kp and d33, were improved. The properties of bismuth manganite doped to PZT ceramics, (1-x)PZT-(x)BiMn2O5 (x = 0.055, 0.11), were studied. The effects of Bi doping in A sublattice and Mn doping in B sublattice were determined. The PZT-BiMn2O5 formed a composite of two solid solutions, one the ferroelectric rhombohedral R3m phase related to PZT, and the orthorhombic Pbam phase originated from bismuth manganite. Composition was estimated by using the scanning electron microscopy. Electrical impedance was measured in 100 Hz–1 MHz and 85–705 K ranges. Two types of the relaxations, manifested in the impedance spectra, were determined. One was attributed to charge transfer in B sublattice and/or polaronic mechanism. Second was fitted by using Vogel-Fulcher law that verified relaxor-like state for 0.89PZT-0.11BiMn2O5 compound. The epoxy-glue/bismuth-manganite composite was obtained. Vogel-Fulcher law confirmed glassy features for this material. Effective role of 0-3 connectivity in suppression of dielectric losses and transient currents was verified.
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