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–xBaTiO3–Bi(Zn0.5Ti0.5)O3 + 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 d33, Curie temperature TC, and depolarization temperature are as high as 184 pC/N, 550 °C, 530 °C at x = 0.3, respectively. It is worth noting that, when x = 0.24, the ceramics have a high TC = 580 °C and low dielectric loss tanδ = 1.9%. The results show that the BFBT-BZT ceramics with high piezoelectric properties are applicable in high-temperature fields.