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中文摘要：
采用固相法应法制备了（1–x）（K0.48Na0.48Li0.04）NbO3–x（Na0.8K0.2）0.5Bi0.5TiO3无铅压电陶瓷,研究了不同x（0,0.5%,1.0%,1.5%,2.0%,3.0%）对材料的相结构、介电性能以及压电性能的影响。结果表明：随着x增加,样品的Curie温度TC与正交到四方相变温度TO–T均逐渐降低,而压电常数d33与机电耦合系数kp均先升高后降低;该体系在0.5%
英文摘要：
（1–x）（K0.48Na0.48Li0.04）NbO3–x（Na0.8K0.2）0.5Bi0.5TiO3lead-free piezoelectric ceramics were synthesized by solid-state reaction method.The phase structure,microstructure,dielectric and piezoelectric properties of ceramic samples were investigated.The influences of different x（x = 0,0.5%,1.0%,1.5%,2.0%,3.0%） content on the phase structure,piezoelectric and dielectric properties of samples were investigated.The results show that Orthorhombic-Tetragonal phase transition temperature and Curie temperature decrease gradually with the increase of x content while both the piezoelectric constant d33 and planar coupling factor kp of samples increase firstly then decrease.The typical PPT（polymorphic phase transition） locates in the composition of 0.5% 〈 x 〈 1.5% and the ceramic sample with x = 1.0% possess both good piezoelectric properties（d33= 226 pC/N,kp= 0.41） and high Curie temperature（437 ℃）.However,the piezoelectric properties of the ceramic near the PPT is sensitive to temperature.
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