Electric features of PZT 70/30-BiMnO3 solid solution ceramics

摘要

We sintered the new (1 - x)Pb(Zr0.70Ti0.30)O-3-xBiMnO(3) (x = 0, 0.055, and 0.11) ceramics. The XRD test has shown the rhombohedral R3m symmetry for the PZT sample. The (1 - x)PZT-xBiMnO(3) samples show the existence of two phases, the one with R3m and the second with orthorhombic Pbam symmetry. Scanning electron microscopy test have shown a lack of bismuth oxide and manganese oxides precipitation. The density of states was calculated for a 40-atom supercell which corresponds to (Pb7Bi)(Zr4Ti3Mn)O-24 and (Pb7Bi)(Zr3MnTi4)O(24)d ceramic compositions. The dielectric spectroscopy was conducted for f = 100 Hz-1 MHz in the 85-705 K range. The electric permittivity test indicated the existence of PZT phase within the PZT-BiMnO3 ceramics. The addition of BiMnO3 caused dispersion of electric conductivity in the low temperature range and induced a relaxor state in the high temperature range. (C) 2015 Elsevier Ltd. All rights reserved.