中文摘要：

采用传统陶瓷烧结工艺制备了（K0．5Na0．5）0．94-2xLi0．06SrxNb0．98Sb0．02O3无铅压电陶瓷，研究了陶瓷的结构、烧结特性及电性能特征．研究结果表明：制备的KNLSN－Srx陶瓷为单一的具有四方相的钙钛矿结构，SEM照片中可以看出材料的平均晶粒尺寸随着Sr掺入量的增加逐渐变大，陶瓷的烧结温度随Sr掺入量的增加而升高，Li，Sr和Sb掺杂（K0．5Na0.5）NbO3后，材料的压电系数d33、平面机电耦合系数％得到提高，同时介电损耗tanδ和机械品质因子Qm降低，Sr掺入量在2mol％时各项性能最佳（d33=130pC／N，kp=34．5％，tanδ=4．2％）．

英文摘要：

Lead-free （K0.5Na0.5）0.94-2xLi0.06SrxNb0.98Sb0.02O3 （KNLSN-Srx; x=0-0.03） piezoelectric ceramics were prepared 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 exhibite a pure perovskite phase with tetragonal symmetry, indicating that the Sr^2＋ 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/% lower tang and Qm were obtained as Li, Sr and Sb were added into KNN ceramics. The comprehensive 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%）.