Enhanced piezoelectric properties of Bi(Mg1/2Ti1/2)O3 modified BiFeO3–BaTiO3 ceramics near the morphotropic phase boundary

• BiFeO3–BaTiO3-xBi(Mg1/2Ti1/2)O3 ceramics were designed to tune MPB to enhance the d33.
• Due to proper proportion between R and PC high d33 = 154 pC/N was achieved at x = 0.04.
• Raman spectrum was used in BF-BT system for analyzing the phase structure.

(0.7-x)BiFeO3−0.3BaTiO3–xBi(Mg1/2Ti1/2)O3 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 εr 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 d33 = 154 pC/N, kp = 28.5% and Pr = 16.2 μm/cm2 were achieved as x = 0.04. This research revealed the potential of BiFeO3–BaTiO3–Bi(Mg1/2Ti1/2)O3 system as promising lead-free piezoelectric ceramics with relatively high Curie temperature TC = 482 °C.

The (0.7-x)BiFeO3−0.3BaTiO3-xBi(Mg1/2Ti1/2)O3 system was designed to create morphotropic phase boundary (MPB) between rhombohedral (R) and pseudocubic (PC) phases to enhance the piezoelectric property. Due to coexisting R–PC two phases near MPB region and the improvement of polarization property, high d33 = 154 pC/N and kp = 28.5% were achieved at x = 0.04.Figure optionsDownload as PowerPoint slide