中文摘要：

采用传统固相法制备了（0.995-x）K（0.48）Na（0.52）NbO3-0.005BiCoO（3-x）Bi（0.5）Na（0.5）ZrO3（KNN-0.005BCxBNZ,x=0～0.045）系无铅压电陶瓷,研究了Bi（0.5）Na（0.5）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= 320pC/N,kp=52%，Pr=19.7μC/cm^2,εr=14.00，tanδ=2.5%，Tc=335.℃。

英文摘要：

Lead-free （0.995-x）K（0.48）Na（0.52）NbO3-0.005BiCoO（3-x）Bi（0.5）Na（0.5）ZrO3（KNN-0.005BC-xBNZ,x=0-0.045）piezoelectric ceramics were fabricated by conventional solid-state technique,and the effect of the Bi（0.5）Na（0.5）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 0.03x≤0.04 may possess the rhombohedral-orthogonal-tetragonal（R-O-T）phases together near room temperature,which enhances significantly the electric properties of the ceramics related.The ceramic with x=0.035 exhibited optimum properties：d33=320pC/N,kp=52%,Pr=19.7μC/cm^2,εr=1 400,tanδ=2.5%,TC=335 ℃.