Study on Phase Transition of BiFeO_3 Powders Prepared by Hydrothermal Method

The perovskite BiFeO3 powders had been synthesized by a mild hydrothermal method,using Fe (NO3)3·9H2O and Bi (NO3)3·5H2O as raw materials,and KOH as the mineralizer,which changed in concentration from 4.5 mol/L to 12.0 mol/L.The perovskite BiFeO3 powders were characterized by XRD (scaning rate=0.008°/s) and the results were simulated by the Peakfit software.The results showed that the phase transition of the as-prepared BiFeO3 powders from rhombohedral phase to hexagonal phase is closely related to the concentration of the mineralizer.The phase transition of the BiFeO3 powders was confirmed by ferroelectric characteristics.