Study On Property Of Piezoelectric Ceramic Material Of PZT System Prepared By Precursor Method

Piezoelectric ceramics based on PZT was studied, including PZTMN, PZTMN/oxide composites and PSZTMN/oxide ternary system with strontium substituting which was formed by double-precursor method. Reaction mechanism and processing of PZT-based ceramics prepared by B-site precursor method were studied and piezoelectric properties, dielectric properties and mechanical properties were also studied by some analysis methods such as XRD, SEM, BET in this thesis.The synthesizing temperature drops from 1350℃to 1190℃by improved B site-precursor method in which submicron raw material was selected. The method may be adopted in industry because of the lower synthesizing temperature.The PZTMN piezoelectric ceramic have excellent piezoelectric properties. When Zr/Ti=48/52 the optimal result wasεr=1632, Tc=303℃, d33=593pC/N, tanδ=0.0272, Kp=0.65. The conclusion that the sample with Zr/Ti≥52/48 and Zr/Ti≤50/50 is rhombohedral and tetragonal respectively was obtained by comparing the XRD pattern. In order to increase the mechanical properties the second phase oxide was introduced. Mechanical properties were enhanced with the addition of oxide within 0.04mol; while piezoelectric and dielectric properties were hardly changed. Double-precursor method was used for preparing PSZTMN/oxide piezoelectric ceramics. When Sr2+ was added to this system, the dielectric properties were improved while the piezoelectric properties were not improved remarkably. When the amount of oxide was 0.02mol, the optimal results ofεr =1938, tanδ=0.03, d33=261pC/N, Kp=0.57, Tc=268℃were obtained.