Effect of Sintering Time on Structure and Properties in CuO-doping KNN-LS-BF Piezoelectric Ceramics

The 0.6mol% CuO-doping 0.996(0.95Na(0.5)K(0.5)NbO(3)-0.05LiSbO(3))-0.004FeBiO(3) (KNN-LSBF-CuO) piezoelectric ceramics were synthesized by a solid-state reaction technique, and the structure and piezoelectric properties dependence of sintering time in KNN-LS-BF-CuO ceramics were studied. It is found that all the samples sintered for various time are perovskite structure mixed with orthorhombic symmetry phase and tetragonal phase, but the sintering time has significant influences on the crystalline and properties. When the sintering time increases from 2 hours to 6 hours, the grain of KNN-LS-BF-CuO ceramics becomes more homogeneous and more tight-arrangement. The experimental results reveal that the longer sintering time than 4 hours is beneficial for improving partial properties, such as d(33), tg, and Q(m), but is adverse to epsilon(r) and k(p), the KNNLS-BF-CuO ceramics with optimum properties can be synthesized for 6 hours at 1 060 degrees C.