Dielectric and piezoelectric properties of BiMnO3 doped 0.95Na0.5K0.5NbO3–0.05LiSbO3 ceramics

Abstract

The piezoelectric properties of (1 − x)(0.95K0.5Na0.5NbO3–0.05LiSbO3)–x BiMnO3 (x = 0, 0.002, 0.004, 0.006, 0.008, 0.01) lead-free piezoelectric ceramics were investigated as a function of x. These ceramics were fabricated by conventional ceramics sintering processing. BiMnO3 (BM)-doping was found to increase the Curie temperature, T c, from 370 °C at x = 0–380 °C at x = 0.002, and clearly increase the d 33, Q m and k p values, showing “hard” characteristic. The good piezoelectric and electromechanical properties of d 33 = 226pC/N, k p = 40.8%, tan θ = 2.60% and T c = 370 °C appear at x = 0.004.