Preparation and Characterization of (K_(0.5)Na_(0.5))_(0.94-2x)Li_(0.06)Sr_xNb_(0.98)Sb_(0.02)O_3 Lead-free Piezoelectric Ceramics

Lead-free(K0.5Na0.5)0.94-2xLi0.06SrxNb0.98Sb0.02O3(KNLSN-Srx;x=0-0.03) piezoelectric ceramics were pre-pared by conventional solid-state sintering process.The sintering characteristic,the microstructure,dielectric,piezo-electric and ferroelectric properties of KNLSN-Srx ceramics were investigated.XRD results show that all samples ex-hibite a pure perovskite phase with tetragonal symmetry,indicating that the Sr2+ has diffused into the KNLSN lattices to form a solid solution.The grain size of KNLSN-Srx ceramics was increased with the increasing of Sr-doping level.The proper sintering temperature of KNLSN-Srx ceramics shifted to higher temperature with increasing the content of Sb.Higher d33 and kp,lower tanδ and Qm were obtained as Li,Sr and Sb were added into KNN ceramics.The compre-hensive good properties of doped(K0.5Na0.5)NbO3 ceramics were obtained when Sr content was 2mol%(d33=130pC/N,kp=34.5%,tanδ=4.2%).