SUN Huajun ¹, LIU Xiaofang ², CHEN Wen ¹, ZHOU Jing ¹, LI Bo ¹, YANG Xiong ¹, LI Junt ¹

(1. School of Materials Science and Engineering, Wuhan University of Technology, 430070; 2. School of Chemical Science and Engineering, Wuhan University of Technology,430070)

Abstract: Pb_1-xBa_x (Zr_0.505Ti_0.495)_0.05(Mn_1/3Nb_1/3Sb_1/3）_0.05O₃（PMNS-PZT, x =0.01, 0.02, 0.03, 0.04 ) ceramics have been prepared by a columbite precursor method. The crystal structure of the quaternary system ceramics was examined by using X-ray diffraction (XRD). It was found that the crystal structure of the quaternary system ceramics prepared by columbite precursor method is pure pervoskite structure. It was also found that the morphotropic phase boundary (MPB) with rhombohedra and tetragonal co-existed crystalline structure for the ceramics lies in the range of x=0.01 -0.03. When x>0.03, the crystal structure of the ceramics is rhombohedra structure. The microstructure of the specimens was investigated by a JEOL JSM5610LV scanning electron microscope (SEM ). Homogeneous and dense microstructure of the system ceramics showing grain sizes of 1 -3µm by SEM images, the grain growth inhibitory effect of Ba^{2 +} is not so obvious. The piezoelectric, ferroelectric and dielectric properties of the quaternary system ceramics were nvestigated as functions of x. When Ba2 •=3mol%, the preferred properties of K_p=0. 50, Q_m=1385, d₃₃=255,ε^T₃₃/ε₀=1273,tan6=0.52% can be obtained, which can be used for ultrasonic motors.

Keywords: columbite precursor method, quaternary system, piezoelectric ceramics, morphotropic phase boundary (MPB),