Abstract
In this study, in order to develop the composition ceramics for ultrasonic sensor with high <TEX>$d_{33}*g_{33}$</TEX>, <TEX>$Pb_{1-3x/2}Bix(Mg_{1/2}W_{1/2})_{0.03}(Ni_{1/3}Nb_{2/3})_{0.09}(Zr_{0.5}Ti_{0.5})_{0.88}O_3$</TEX>(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 <TEX>$940^{\circ}C$</TEX> by adding sintering aids. At x=0.015 specimen, the density, electromechanical coupling factor(<TEX>$k_p$</TEX>), dielectric constant, piezoelectric constant(<TEX>$d_{33}$</TEX>) and piezoelectric figure of merit(<TEX>$d_{33}*g_{33}$</TEX>) indicated the optimal properties of <TEX>$7.90g/cm^3$</TEX>, 0.67, 2,511, 628 pC/N, and <TEX>$17.7pm^2/N$</TEX>, respectively, for duplex ultrasonic sensor application.
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