Abstract
Enhanced comprehensive performances of piezoelectric and temperature stability are obtained in 0.725Bi1.05FexO3-0.275BaTiO3-0.3%MnO2 ceramics via tuning nonstoichiometric Fe content. The Fe content strongly affects the phase structure of ceramics, which possess rhombohedral-pseudocubic coexistence structure, boosting the high piezoelectricity in this system. The optimal comprehensive performances of ceramics are obtained at x = 0.98 with a relatively large piezoelectricity (d33 ∼158 pC/N) as well as a high Curie temperature (TC ∼523 °C). We found that the deficiency of Fe content gives rise to diffused phase boundary and oxygen vacancies, which induces strong thermal stability over a wide temperature range in the composition. This work discloses the Fe content play an important role in the crystal structure of BF-based materials. We expect that the investigation on nonstoinchiometry of Fe will lead an effective method to develop high-performance BiFeO3-based ceramics for lead-free electronic applications.
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