Abstract
CeO 2-doped (Bi 0.5Na 0.5) 0.94Ba 0.06TiO 3 lead-free piezoelectric ceramics (0–1.0 wt.%) were synthesized by conventional solid-state processes. X-ray diffraction (XRD) data shows that CeO 2 diffuses into the lattice of (Bi 0.5Na 0.5) 0.94Ba 0.06TiO 3 ceramics and forms pure perovskite phase. SEM images indicate that a small amount of CeO 2 addition affects the microstructure. The electrical properties of (Bi 0.5Na 0.5) 0.94Ba 0.06TiO 3 ceramics have been greatly improved by a certain amount of CeO 2 addition. The temperature dependence of the dielectric constant and dissipation factor shows that the transition temperature from ferroelectric to antiferroelectric phase ( T d) decreases with the addition of CeO 2. At the room temperature, the ceramics doped with 0.4 wt.% CeO 2 show quite good performance with high piezoelectric constant ( d 33 = 128 pC/N), high planar coupling factor ( k p = 0.283), high mechanical quality factor ( Q m = 216), high thick coupling factor ( k t = 0.54), high dielectric constant ( ɛ r = 891) and low dissipation factor (tan δ = 0.0185) at 1 kHz, which indicates that CeO 2-doped sample is of high piezoelectric properties and low dissipation factor. Possible mechanism of the influence of CeO 2 addition on the dielectric and piezoelectric properties is discussed.
Published Version
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