中文摘要：

利用传统的电子陶瓷工艺制备了（1-x）（K0.54Na0.46）NbO3-xLiSbO3[（1-x）KNN-xLS]无铅压电陶瓷，研究了LiSbO3对（KNN-xLS陶瓷的相结构与介电压电性能的影响．研究结果表明，（1-x）KNN-xLS陶瓷的准同型相界位于0．04〈x〈0．06；（1-x）KNN-xLS陶瓷的电学性能强烈地依靠化学成分，在准同型相界附近具有加强的电学性能；（1-x）KNN-xLS0=O．05）陶瓷的室温压电常数达220pC/N，径向机电耦合系数达43％，居里温度为368℃，正交．四方转变温度为90℃，介电常数为l145，介电损耗为2．8％，剩余极化值为26．6p．C/cm^3，矫顽场为13．8kV/cm．因此可以认为，该陶瓷体系是具有应用前景的无铅压电陶瓷材料之一．

英文摘要：

Lead-free piezoelectric ceramics （1-x）（K0.54Na0.46）NbO3-xLiSbO3 [（1-x）KNN-xLS] were prepared by ordinary sintering. A morphotropic phase boundary （MPB） between orthorhombic and tetragonal phases was identified in the composition range of 0.04〈x〈0.06. The ceramics near the MPB exhibit a strong compositional dependence and enhanced piezoelectric properties. It is found that the samples with 5 tool% LS exhibit enhanced electrical properties： the piezoelectric constant d33-220pC/N, the electromechanical coupling coefficient kp-43%; the Curie temperature Tc-368℃; the orthorhombic-tetragonal phase transition To-t=90℃; the remnant polarization Pr-26.6 μC/cm^2; the coercive field Ec-13.8 kV/cm. These results show that （1-x）KNN-xLS is a promising lead-free piezoelectric material.