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Pure BiFeO3 powders were synthesized by homogeneous coprecipitation method,and BiFeO3 ceramics were prepared in O2 atmosphere by the method of pressureless sintering.It was analyzed that the influences of the stress on ferroelectric and ferromagnetic domains in BiFeO3 ceramics.The influences of impurities and defects were observed in ferroelectric domains of BiFeO3 ceramics,through methods of scanning electron microscopy(SEM),and transmission electron microscopy ferroelectric(TEM).