Relationship between structure and properties in high-temperature Bi(Al0.5Fe0.5)O3-PbTiO3 piezoelectric ceramics

Highlights: → Low-cost Bi-based high temperature piezoceramics. → A new high temperature system with Curie point >478 deg. C, compared to BiScO3-PbTiO3 (450 deg. C). → Effectively improve the poling conditions. - Abstract: Ceramic samples of xBi(Al0.5Fe0.5)O3-(1 - x)PbTiO3 (BAF-PT, x = 0.05-0.5) solid solutions were fabricated using the conventional solid state reaction method. X-ray diffraction analysis revealed that all compositions can form single perovskite phase with tetragonal symmetry. The relationship between the tetragonal lattice parameters, tetragonality c/a, cell volume, and ferro-piezoelectric characterization as a function of x was systematically investigated. The BAF modification can effectively improve the poling condition at a proper BAF content. A combination of piezoelectric constant of d33 (50-60 pC/N), electromechanical planar coupling coefficients of kp (20.3-22.5%), and high Curie temperature Tc (>478 deg. C) suggested that BAF-PT could be a good candidate for high-temperature piezoelectric applications.