采用固相烧结法制备了K0.5Na0.5NbO3-LiSbO3-xBi(Fe09Mn01)O3+σKNN-LS-BF9M1)无铅压电陶瓷,研究了不同BF9M1掺杂量(x分别为0,0.002,0.004,0.006,0.008)对所制陶瓷的显微结构、物相组成及电性能的影响.结果表明,少量BF9M1掺杂能有效抑制KNN陶瓷晶粒的生长,促进组织致密化.当x从0增加到0.006时,样品发生正交-四方相变,同时正交-四方相变温度to-t从95℃降低到40℃；另一方面,压电性能得到明显提高、介质损耗有所降低.当x=0.006时,样品具有最好电性能:d33=260pC/N,tanδ =2.03×10-2,kp=51.9％,εr1241,Qm=44.7,tc =345℃,to-t=45℃.
无铅压电陶瓷 K0.5Na0.5NbO3 显微结构 压电性能