In this study, in order to develop the composition ceramics for ultrasonic sensor with high d33*g33, (Pb1-3x/2Bix(Mg1/2W1/2)0.03(Ni1/3Nb2/3)0.09(Zr0.5Ti0.5)0.88O3)(PMW-PNN-PZT) system ceramics were prepared using CuO as sintering aids. And then, their microstructure, piezoelectric and dielectric characteristics were systemetically investigated with bismuth substitution. The PMW-PNN-PZT ceramic specimens could be sintered at sintering temperature of 940℃ by adding sintering aids. At x=0.015 specimen, the density, electromechanical coupling factor(kp), dielectric constant, piezoelectric constant(d33) and piezoelectric figure of merit(d33*g33) indicated the optimal properties of 7.90 g/cm3, 0.67, 2,511, 628 pC/N, and 17.7 pm2/N, respectively, for duplex ultrasonic sensor application.
