Abstract
In this study, in order to. develop the low temperature sintering ceramics for multilayer piezoelectric actuator, PMN-PNN-PZT ceramics using CuO, <TEX>$Bi_{2}O_{3}\;and\;Li_{2}CO_{3}$</TEX> as sintering aids were manufactured with the amount of <TEX>$WO_{3}$</TEX> addition. The ceramics were sintered at <TEX>$900,\;930,\;960^{\circ}C$</TEX>, respectively. Thereafter, their microstructural, dielectric and piezoelectric properties were investigated. The <TEX>$WO_{3}$</TEX> was proved to lower the sintering temperature of piezoelectric ceramics due to the effects of PbO and <TEX>$WO_{3}$</TEX> liquid phase. At 0.3 wt% <TEX>$WO_{3}$</TEX> added specimen sintered at <TEX>$930^{\circ}C$</TEX>, electromechanical coupling factor(<TEX>$k_{p}$</TEX>), mechanical quality factor(<TEX>$Q_{m}$</TEX>), dielectric constant and <TEX>$d_{33}$</TEX> showed the optimum values as the values of 0.60, 1,402, 1,440 and 360 pC/N, respectively, for multilayer piezoelectric actuator application.
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