采用传统陶瓷制备方法制备了一种新型无铅压电陶瓷材料(1-x)Bi0.5(Na0.82K0.18)0.5TiO3-xLiNbO3(BNKT-LNx).研究了LiNbO3对BNKT-LNx陶瓷晶体结构、显微组织和压电性能的影响.结果表明:在所研究的组成范围内陶瓷材料均能够形成纯钙钛矿固溶体,LiNbO3促进陶瓷品粒生长.陶瓷介电温谱存在两个反常峰,随LiNbO3含量增加低温反常峰向低温移动,εm降低,介电弥散相变特征越明显.在x=0.01时该体系陶瓷压电性能达到最大值:d33=195 pC/N,kp=0.336.
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