Piezoelectric and dielectric properties of Pb(Ni/sub 1/3/Nb/sub 2/3/)O/sub 3/ -Pb(Mn/sub 1/3/Nb/sub 2/3/)O/sub 3/-Pb(Zr,Ti)O/sub 3/ ceramics for piezoelectric transformer

In this study, the structural, dielectric and piezoelectric properties of Pb[(Ni/sub 1/3/Nb/sub 2/3/)/sub x/ - (Mn/sub 1/3/Nb/sub 2/3/)/sub 0.09-x/ (Zr/sub 0.505/Ti/sub 0.495/)/sub 0.91/]O/sub 3/ (x = 0, 0.01, 0.02, 0.03, 0.04, 0.05) system ceramics were investigated to develop the composition for piezoelectric transformers. All the specimens were sintered at 1250/spl deg/C and their physical properties were measured, and the results are as follows; With increasing PNN substitution for PMN-PZT system, the dielectric constant was increased and the electro-mechanical coupling factor (kp) was increased to 0.62 at 5 mol% while the mechanical quality factor (Qm) decreased.