Electrical properties and microstructure of CeO2-doped (Bi0.5Na0.5)0.94Ba0.06TiO3 piezoelectric ceramics

CeO2-doped (Bi0.5Na0.5)0.94Ba0.06TiO3 (abbreviated as BNBT6) lead-free piezoelectric ceramics (0 ～1.0 wt %) were synthesized by conventional solid-state processes. X-ray diffraction (XRD) data shows that CeO2 diffuses into the lattice of (Bi0.5Na0.5)0.94Ba0.06TiO3 ceramics and forms pure perovskite phase. SEM images indicate that a small amount of CeO2 addition affects the microstructure. The temperature dependence of the dielectric constant and dissipation factor shows that the transition temperature from ferroelectric to antiferroelectric phase (Td) decreases with the addition of CeO2. At the room temperature, the ceramics doped with 0.4wt% CeO2 show quite good performance with high density ( =5.836g/cm3), high piezoelectric constant (d33=136pC/N), high coupling factor (kp = 0.303), high dielectric constant (r=891) and low dissipation factor (tan=0.0185).