摘要
以水热法制备的KNbO3,NaNbO3,BiFeO3(BF)粉体等为原料,采用常压烧结法在1065℃下烧结2h制备了0.992K0.5Na0.5NbO3-0.008BiFeO3无铅压电陶瓷,并研究了BiFeO3掺杂对0.992K0.5Na0.5NbO3-0.008BiFeO3无铅压电陶瓷结构和压电的影响.研究结果表明:BiFeO3掺杂使K0.5Na0.5NbO3无铅压电陶瓷正交相减弱,晶粒尺寸由6μm减小到1μm;压电性能有一定提高,压电常数(d33)、机电耦合系数(kp)分别达到120pC/N和37.8,居里温度Tc由444.4℃减少至420.6℃.
In this study, Lead-free piezoelectric ceramics of the 0.992K0.5Na0.5NbO3-0.008BiFeO3 were prepared at 1 025 ℃ for 2 h, following the mixed pure KNbO3 （KN）, NaNbO3（NN）, BiFeO3 （BF） powers which were prepared by a hydrothermal method. The phase structure and the electric properties of the ceramics were studied. It is found that the doping of BiFeO2 decreases the value of orthogonality of the KNN ceramics and decreases the grain size from 6 μm to 1 ,μm. Simultaneously the piezoelectric properties is increasing, the piezoelectric constant d33 and planar mode electromechanical coupling coefficient kp reach to 120 Pe/N and 37.8, the curie temperature Tc decreases from 444.4 ℃ to 420.6 ℃.
出处
《陕西科技大学学报（自然科学版）》
2013年第6期73-76,94,共5页
Journal of Shaanxi University of Science & Technology
基金
陕西省教育厅科研计划专项项目(12JK0445)
国家级大学生创新创业训练计划项目(201210708023)
