Piezoelectric properties of MnO2 doped low temperature sintering Pb(Mn1/3Nb2/3)O3–Pb(Ni1/3Nb2/3)O3–Pb(Zr0.50Ti0.50)O3 ceramics

Abstract

In this study, in order to develop the composition ceramics for low loss and low temperature sintering multilayer piezoelectric actuator, Pb(Mn1/3Nb2/3)O3–Pb(Ni1/3Nb2/3)O3–Pb(Zr0.50Ti0.50)O3 (abbreviated as PMN-PNN-PZT) ceramics were fabricated using Li2CO3 and Na2CO3 as sintering aids, and their piezoelectric and dielectric characteristics were investigated according to the amount of MnO2 addition. At the 0.2 wt% MnO2 doped specimen sintered at 900 °C, density and mechanical quality factor (Q m) showed the maximum values of 7.81[g/cm3]and 1186, respectively. And also, at 0.1 wt% MnO2 doped specimen, electromechanical coupling factor (k p), piezoelectric constant (d 33) of specimen showed the maximum values of 0.608 and 377[pC/N], respectively. Dielectric constant (ɛ r) slightly decreased with increasing MnO2. Taking into consideration the density of 7.81[g/cm3], electromechanical coupling factor (k p)of 0.597 the mechanical quality factor (Q m) of 1,186, and piezoelectric constant (d 33) of 356[pC/N], it could be concluded that 0.2 wt% MnO2 doped composition ceramics sintered at 900 °C was best for low loss and low temperature sintering multilayer piezoelectric actuator application.