Abstract
Abstract Bismuth ferrite crystallites were prepared by the hydrothermal method. The phase evolution in the process of hydrothermal reactions was investigated for different conditions. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis indicates that sillenite Bi 25 FeO 40 could be the intermediate products, while perovskite BiFeO 3 was the target crystallite. The phase evolution could be controlled by adjusting KOH concentration, reaction temperature and duration time et al. The dissolution of Fe(OH) 3 plays an important role to control the phase formation of bismuth ferrites. Bi 25 FeO 40 and BiFeO 3 crystallites have the cubic and sphere-like morphologies respectively. The formation of perovskite BiFeO 3 crystallites was based on the dissolution of sillenite Bi 25 FeO 40 .
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