Effects of ZnO on the Piezoelectric Properties of PMS-PZT Ceramics

Perovskite Pb(Mn_{1/3}Sbu_{2/3})O_2-Pb(Zr,Ti)O_3\;(PMS-PZT) was prepared and ZnO doping effects on its piezoelectric properties were investigated. Pyrochlore phase was not identified in the PMS-PZT ceramics with ZnO sintered at for 2 hrs, and maximum sintered density of was obtained. Piezoelectric charge constant and voltage constant increased to , respectively, with increasing ZnO content. Mechanical quality factor reduced considerably with increasing ZnO content. When the ZnO content was 3 , electromechanical coupling factor and relative dielectric constant showed maximum values of and 1727, respectively. This should be evaluated by complicated variations of sintered density, tetragonality of lattice, grain size, and A-site vacancy generated by ZnO addition and substitution.