Dielectric and magnetic properties of BiFeO3 ceramics prepared by hydrothermal synthesis

Single-phase BiFeO3 powders were prepared at a temperature of 200 °C by a hydrothermal synthesis. BiFeO3 ceramics were prepared with the powders by a conventional ceramic process. The BiFeO3 ceramics with no impurity phase were prepared at the sintering temperature of 650–800 °C. The dense microstructure was observed in the BiFeO3 ceramics sintered at a temperature of 700 °C and higher. BiFeO3 ceramics show linear M–H curves in low H, which are antiferromagnetic behaviors. The dielectric dispersion was observed at the frequency range of 10 kHz to 1 MHz in the BiFeO3 ceramic sintered at 700 °C or lower. The dielectric constant and loss of the BiFeO3 ceramics sintered at 750 °C or higher were about 85 and 0.4 at 100 kHz, respectively.