Abstract
Multiferroic 0.4 mol%- MnO 2-doped 0.78 BiFeO 3–0.22 BaTiO 3 ceramics were prepared by a traditional ceramic process. The effects of doping and annealing on the dielectric and ferroelectric properties were intensively investigated. Dielectric dispersion like relaxor ferroelectrics was observed in the oxygen annealed sample, but disappeared in the vacuum annealed sample. Modification of the BiFeO 3– BaTiO 3 with MnO 2 and annealing in vacuum improved DC resistivity obviously. The spontaneous polarization, remnant polarization, and coercive field are 65.2 μC/cm2, 59.5 μC/cm2 and 21.9 kV/cm, respectively under an applied field of 35 kV/cm.
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