BiFeO3-BaTiO3 piezoelectric ceramics with high depolarization temperature by fine tuning phase boundary

BiFeO3-BaTiO3 (BF-BT)-based lead-free ceramics have attracted widespread attention in high-temperature piezoelectric fields owing to its high Curie temperature (T-C). Comparing with bismuth-layered high-temperature piezoelectric ceramics, better piezoelectric coefficient of BF-BT show advantages in boosting the sensitivity. Nevertheless, achieving high piezoelectric performance in BF-BT-based ceramics is restricted by ambiguous phase boundary and high leakage conduction. Herein, the phase structures, microstructures, piezoelectric properties together with electrical properties of the (1-x)Bi1.02FeO3-xBaTiO(3) (BF-xBT) ceramics were investigated and discussed systematically within a narrow compositional range. With the intention of seeking the optimized composition and properties near the morphotropic phase boundary since the sensitive functional properties to the x contents. The results of d(33) = 191 pC/N, T-c = 485 degrees C along with high T-d of similar to 486 degrees C were obtained in BF-0.31BT ceramics, which proves BF-0.31BT piezoelectric ceramics a competitive high-temperature piezoelectric application material.