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

(1 − x) (0.95K0.5Na0.5NbO3–0.05LiSbO3)–xBiScO3 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 0.002 ≤ x ≤ 0.01. When 0.002 ≤ x ≤ 0.008, the ceramics have excellent electrical properties of d33 = 265–305 pC/N, kp = 45–54%, ɛr = 1346–1638, Curie temperature Tc = 315–370 °C and depolarizing temperature Td = 315–365 °C, comparable to that of other KNN-based piezoceramics. The results indicate that the ceramics are promising lead-free piezoelectric materials.