Effect of Nb2O5 Addition on the Electrical and Physical Properties of Lead-Free 0.98(Na0.5K0.5)NbO3-0.02(Na0.5Bi0.5)TiO3 Piezoelectric Ceramics
In this paper, the effects of Nb2O5 addition on the electrical and physical properties of 0.98(Na0.5K0.5)NbO3-0.02(Na0.5Bi0.5)TiO3 were investigated. The 0.98(Na0.5K0.5)NbO3-0.02(Na0.5 Bi0.5)TiO3 [0.98NKN-0.02NBT] ceramics with the addition of 0~1.5 wt% Nb2O5 have been prepared following the conventional mixed oxide process. X-ray diffraction analysis revealed that, during sintering, all of the (Na0.5Bi0.5)TiO3 diffuse into the lattice of (Na0.5K0.5)NbO3 to form a solid solution, in which an orthorhombic phase with a perovskite structure was found. For 0.98NKN-0.02NBT ceramics by doping 0.3 wt% Nb2O5, the poled dielectric constant (K33T) is 1180. The electromechanical coupling coefficients of the planar mode kp and the thickness mode kt reach 0.43 and 0.52, respectively. Our results show that 0.98NKN-0.02NBT with the addition of 0.3 wt% Nb2O5 is a good lead-free piezoelectric ceramic.
Chengming Li, Chengbao Jiang, Zhiyong Zhong and Yichun Zhou
C. H. Wang "Effect of Nb2O5 Addition on the Electrical and Physical Properties of Lead-Free 0.98(Na0.5K0.5)NbO3-0.02(Na0.5Bi0.5)TiO3 Piezoelectric Ceramics", Materials Science Forum, Vol. 687, pp. 269-274, 2011