The (1-x)BiFeO3-xBaTiO3-Bi(Zn0.5Ti0.5)O3 high-temperature lead-free piezoelectric ceramics with strong piezoelectric properties

The structure, microstructure, piezoelectric properties, ferroelectric properties and Curie temperature of (1 - x)BiFeO3-xBaTiO(3)-Bi(Zn0.5Ti0.5)O-3 + MnO2 + Li2CO3 ceramics were investigated experimentally. The samples were prepared by the improved solid-state reaction approach. The crystalline structures were examined by X-ray diffractometry. When x = 0.3, the rhombohedral and pseudocubic phases coexist in the ceramic structure. It is considered that the morphotropic phase boundary was formed here. At this composition, the piezoelectric performance d(33), Curie temperature T-C, and depolarization temperature are as high as 184 pC/N, 550 degrees C, 530 degrees C at x = 0.3, respectively. It is worth noting that, when x = 0.24, the ceramics have a high T-C = 580 degrees C and low dielectric loss tan delta = 1.9%. The results show that the BFBT-BZT ceramics with high piezoelectric properties are applicable in high-temperature fields.