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Abstract
Densed BiFeO3(BFO) ceramics were sintered by using soft chemical derived fine powders. The microstructures, polarization and dielectric properties were investigated by means of X-rays diffraction (XRD), Scanning electron microscope (SEM), ferroelectric test system and impedance analyzer. The XRD patterns indicate that BFO ceramics with a single distorted perovskite structure are formed and no secondary phase appears in the ceramics. Through the dielectric response investigated over a wide range of temperature and frequency, it is found that the BFO ceramic sintered at 800°C exhibited high dielectric permittivity and two dielectric relaxations. The remanent polarization and maximum polarizations were 0.232 and 0.443 μC/cm2, respectively (at 25 kV/cm).
Acknowledgments
This work was supported from funds from FEDER (Programa Operacional Factores de Competitividade COMPETE) and from FCT – Fundação para a Ciência e Tecnologia under the project PEst-C/FIC/UI0036/2011 and FCT R&D project of PTDC/FIS/116146/2009. This work was also finance supported by the FCT grant of SFRH/BPD/81745/2011.