（0．995－x）K0．48Na0．52NbO3-0．005BiCoO3-xBi0．5Na0．5ZrO3无铅压电陶瓷相结构及电学性能的研究∗

摘要

采用传统固相法制备了(0．995－x)K0．48 Na0．52 NbO3-0．005BiCoO3-xBi0．5 Na0．5 ZrO3(KNN-0．005BC-xBNZ,x＝0~0．045)系无铅压电陶瓷,研究了Bi0．5 Na0．5 ZrO3的引入对KNN基无铅压电陶瓷相结构和电学性能的影响.研究结果表明,BNZ的引入能够同时使KNN陶瓷的正交-四方相变温度(TO-T)向低温方向移动,三方-正交相变温度(TR-O)向高温方向移动.当0．03＜x≤0．04时,陶瓷在室温附近正交-四方(O-T)相和三方-正交(R-O)相(即R-O-T相)共存,使陶瓷的电学性能得到大幅提高；当x＝0．035时,陶瓷具有最优的电学性能：d33＝320 pC/N,kp＝52％,Pr＝19．7μC/cm2,εr＝1400,tanδ＝2．5％,TC＝335℃.%Lead-free (0.995-x)K0.48 Na0.52 NbO3-0.005BiCoO3-xBi0.5 Na0.5 ZrO3 (KNN-0.005BC-xBNZ,x=0-0.045)piezoelectric ceramics were fabricated by conventional solid-state technique,and the effect of the Bi0.5 Na0.5 ZrO3 content on the phase structure and electrical properties of KNN-based ceramics were investigated. It was found that the addition of BNZ can shift the transition temperature of orthogonal-tetragonal phases (TO-T)to a lower temperature and the transition temperature of rhombohedral-orthogonal phases (TR-O)to a higher temperature.As a result,the ceramics with the compositions of 0.03