In this study, (1-x)Pb(Mg1/2W1/2)0.03(Ni1/3Nb2/3)0.09(Zr0.5Ti0.5)0.88O3 + xCeMnO3 (x= 0∼0.02) ceramics were prepared by Columbite precursor method. The phase structure, ferroelectric and piezoelectric properties were systematically investigated. It was found that PMW-PNN-PZT possessed superior electrical properties due to its composition close to the MPB (morphotropic phase boundary). Coercive electric field of 10.05 [kV/cm] and density of 7.88 [g/cm3] were obtained when the substitution amount of CeMnO3 is x=0.02. In contrast, specimens with x=0.01 showed the mechanical quality factor(Qm) of 1,091 and the electromechanical coupling factor(kp) of 0.613.

In this study, non-stoichiometric 1-x[(K0.5Na0.5)0.97(Nb0.96Sb0.04)O3] + x CeMnO3 + 0.8 mol%CuO + 0.2 wt% Ag2O (x=0, 0.005) ceramics were prepared by a conventional mixed oxide and carbonate method, their dielectric and piezoelectric properties were investigated with the variations of sintering temperature. As CeMnO3 substitution incereased, the density, piezoelectric constant(d33) and dielectric constant(εr) were increased and the mechanical quality factor(Qm) was decreased. At the sintering temperature of 1100℃, the density, electromechanical coupling factor(kp), dielectric constant(εr) and piezoelectric constant(d33) of 0.5mol% CeMnO3 specimen showed the optimun values of 4.475 g/㎤, 0.437, 552 and 166 pC/N, respectively. However, the mechanical quality factor(Qm) showed the minimum value of 380.