LIU Lihua, JIANG Xiangping, JIANG Fulan, ZHENG Yanyan

(Department of Material Science and Engineering, J ingdezhen Ceramic Ins titute, 333001)

Abstract: Lead-free Li_xNa_{(0.52 - x)}K_0.48NbO₃ piezoelectric ceramics were prepared by a solid reaction method.The piezoelectric properties and micros tructure of Li_xNa_{(0.52 - x)}K_0.48NbO₃ were inves tigated. The results show that all specimens exhibit a perovskite structure and the phases tructure at room temperature trans forms from orthorhombic to tetragonal with the increase of Li.Meanwhile,The dens ities were heightened and s intering temperature was decreased.The Li_xNa_{(0.52 - x)}K_0.48NbO₃(x =0.05) ceramics exhibits an excellent piezoelectric properties with the piezoelectric cons tant d₃₃,the electromechanical coupling coefficient k_p, Loss tangent tanδ of 117pc/N, 36.4%,and 0.032,respectively.

Keywords: lead- free piezoelectric ceramics , piezoelectric properties , perovskite s tructure