Structure and electrical properties of (1-x)(Na0.5Bi0.5)0.94Ba0.06TiO3-xSmAlO3 lead-free piezoelectric ceramics

(1 - x)(Na0.5Bi0.5)(0.94)Ba0.06TiO3-xSmAlO(3) [(1 - x)BNBT6-xSA] lead-free piezoelectric ceramics were synthesized by conventional solid-state method. Effects of composition on the micro-structure and electrical properties of (1 - x)BNBT6-xSA ceramics were investigated. X-ray diffraction data shows that (1 - x)BNBT6-xSA ceramics form the pure perovskite phases, and the ceramics have the morphotropic phase boundary when x a parts per thousand currency sign 0.0100. At room temperature, the electrical properties of the BNBT6 ceramics have been improved with the addition of appropriate SA. At room temperature, (1 - x)BNBT6-xBA ceramics at x = 0.0100 has the highest remnant polarization (P (r) = 47 mu C/cm(2)), the highest piezoelectric coefficient (d (33) = 179 pC/N), the highest planar coupling factor (k (p) = 0.296), the higher dielectric constant (E > (r) = 1154) and higher mechanical quality factor (Q (m) = 131).