Enhanced piezoelectric properties of Bi(Mg1/2Ti1/2)O3 modified BiFeO3 BaTiO3 ceramics near the morphotropic phase boundary
Abstract (0.7 x )BiFeO 3 0.3BaTiO 3 x Bi(Mg 1/2 Ti 1/2 )O 3 system was designed to obtain morphotropic phase boundary (MPB) between rhombohedral R phase and pseudocubic PC one to enhance the piezoelectric property. Their phase structures were investigated by the X ray diffraction, temperature dependence of dielectric constant e r and Raman spectrum, which revealed that the phase transition exists from R PC two phase coexistence at 0.00 x 0.04 to PC phase at 0.06 x 0.08 at room temperature. Due to coexisting R PC two phases near MPB region and the improvement of polarization property, high d 33 154 pC/N, k p 28.5% and P r 16.2 mm/cm 2 were achieved as x 0.04. This research revealed the potential of BiFeO 3 BaTiO 3 Bi(Mg 1/2 Ti 1/2 )O 3 system as promising lead free piezoelectric ceramics with relatively high Curie temperature T C 482 degC.