Piezoelectric Properties of PMS-PZT with Bi2O3 and CeO2 for a Rosen-Type Transformer

Recently, piezoelectric transformers have been applied to many fields. Multi layer piezoelectric transformers have the advantage of high step up ratio, high electromechanical coupling coefficient (K-p) and high mechanical quality factor (Q(m)), but they axe subject to the peeling phenomenon and the need for an increased sintering temperature made the price of costly electrodes. Thus, in this study, we discuss a method to fabricate of high-power Rosen-type piezoelectric transformers. The high-power Rosen-type piezoelectric transformers were synthesized using 0.05Pb(Mn1/3Sb2/3)O-3-0.48PbZrO(3)-0.47PbTiO(3) (abbreviated as PMS-PZT) ceramics. The density, the microstructure and the dielectric and piezoelectric properties as functions of the sintering temperature were investigated and an addition of Bi2O3 and CeO2 resulted in a significant improvement in the piezoelectric properties. The results indicated that the following optimal properties of ceramics were obtained at a sintering temperature of 1200 degrees C: epsilon(r) = 880, tan delta = 0.0075, K-p = 0.57, Q(m) = 1124 and d(33) = 304 pC/N.