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