Abstract: BiFeO3-based lead-free piezoelectric ceramics often had poor piezoelectric properties due to large leakage currents. However, the methods of improving its insulating and electrical properties were more complicated, limiting its industrial production and application. In this work, the high insulating and high piezoelectric properties were achieved by simple raw material pretreatment (changing the drying time of Fe2O3 raw material) without component doping and atmosphere sintering of 0.7BiFeO3-0.3BaTiO3 ceramics. The results show that with the increase of the drying time of Fe2O3 raw materials, the grain sizes and insulating of 0.7BiFeO3-0.3BaTiO3 ceramics are significantly improved, and their electrical properties and temperature stability are also significantly enhanced. When the drying time of the raw material is increased to 192 h, the sample grain size is the largest, the insulating is the best, and the piezoelectric properties (d33=203 pC/N, kp=0.33) and Curie temperature (Tc=460 ℃) are also optimal. This provide a new idea for the future study of the piezoelectric properties of BiFeO3-based ceramics.
Key words: 0.7BiFeO3-0.3BaTiO3, lead-free piezoelectric ceramics, raw material pretreatment, insulating, piezoelectricity, Curie temperature, temperature stability
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