Enhancing piezoelectric properties by introducing Ni ion into B-site of Li/Sb-modified (K,Na)NbO3 Pb-free piezoceramics

Abstract

By introducing Ni ion into the B-site of perovskite lattice, (K 0.47Na0.51Li0.02)(Nb0.94-xSb 006Nix)O3 (KNN-LSN, x = 0, 0.002, 0.005, and 0.008) Pb-free piezoceramics were prepared by solid state reaction method. The effect of Ni doping amounts on the structure and electrical properties of KNN-LSN ceramics were investigated. XRD results showed that all ceramics had pure orthorhombic perovskite structure. The introduction of Ni ion into B-site of KNN-LSN ceramics effectively improved the electrical properties. The optimal electrical properties of d33 = 192pC/N, kp = 38.6%, Qm = 128, εr = 756, tan δ = 0.025, Pr = 25.6 μC/cm2, and Ec = 1.21kV/mm were obtained when Ni doping amount x = 0.005, indicating that this ceramic was a promising Pb-free candidate for practical use. © 2012 The Ceramic Society of Japan.