Piezoelectric and dielectric properties of K0.5Na0.5NbO3–LiSbO3–BiScO3 lead-free piezoceramics

(1a degree x) (0.95K0.5Na0.5NbO3-0.05LiSbO3)-xB iScO3 lead-free piezoceramics have been fabricated by an ordinary pressure-less sintering process. The relationship between the BS content, phase structure, density, and piezoelectric properties and their temperature stability was discussed particularly. All compositions show a main perovskite structure, showing room-temperature symmetries of orthorhombic at x =0, of tetragonal at 0.002a[control][curren] x a[control][curren]0.01. When 0.002a[control][curren] x a[control][curren]0.008, the ceramics have excellent electrical properties of d 33 =265-305pC/N, k p =45-54%, E> r =1346-1638, Curie temperature T c =315-370A degree C and depolarizing temperature T d =315-365A degree C, comparable to that of other KNN-based piezoceramics. The results indicate that the ceramics are promising lead-free piezoelectric materials.