DIELECTRIC AND PIEZOELECTRIC CHARACTERISTICS OF 0.07Pb (Mn_1/3Nb_2/3) O₃ −0.10Pb (Ni_1/3Nb_2/3) O₃− 0.83Pb(Zr_0.48Ti_0.52) O₃ CERAMICS ACCORDING TO THE HEATING RATE

ABSTRACT

In this study, in order to develop the composition ceramics for low loss multilayer piezoelectric actuator, 0.07Pb (Mn_1/3Nb_2/3) O₃ −0.10Pb (Ni_1/3Nb_2/3) O₃− 0.83Pb(Zr_0.48Ti_0.52) O₃ (abbreviated as PMN-PNN-PZT) ceramics were fabricated using Li₂CO₃, Bi₂O₃ and CuO as sintering aids and according to variation of heating rate. And also, their dielectric and piezoelectric properties were investigated. At the heating rate of 700°C/h and sintering temperature of 900°C, density, electromechanical coupling coefficient (kp), mechanical quality factor (Qm), dielectric constant (ε _r ) and piezoelectric constant (d₃₃) of PMN-PNN-PZT ceramics showed the excellent values of 7.67 g/cm³, 0.58, 1199, 1560 and 380 pC/N, respectively for low loss multilayer piezoelectric actuator application.

Keywords:

• variation of heating rate
• attrition milling
• excess of PbO

ACKNOWLEDGMENTS

This work was supported by grant No. (R01-2006-000-10120-0) from the Basic Research Program Korea Science and Engineering Foundation of Ministry of Science & Technology and KERI.