Dielectric and Piezoelectric Characteristics of PMN-PNN-PZT Ceramics with the methods of $MnO_2$ additon

$MnO_2$ 첨가방법에 따른 PMN-PNN-PZT 세라믹스의 유전 및 압전특성

In the study, in order to develop low temperature sintering ceramics for multilayer piezoelectric actuator, PMN-PNN-PZT ceramics were fabricated using $Na_2CO_3,\;Li_2CO_3$ as sintering aids and their dielectric and piezoelectric properties were investigated according to the variations of $MnO_2$ as additives and sintering aids. At the sintering temperature of $900^{\circ}C$ and 0.1wt% $MnO_2$ as sintering aids, density, electromechanical coupling factor$(k_p)$, mechanical quality factor$(Q_m)$, piezoelectric constant$(d_{33})$, and dielectric constant $({\varepsilon}_r)$ showed the optimum value of $7.87[g/cm^3]$, 0.61, 1131, 1127 and 376, respectively, for multilayer piezoelectric actuator application.