Effect of PZT Content on Dielectric and Piezoelectric Properties of PZT-PZN-PMnN Ceramics
Abstract
The xPb(Zr0.47Ti0.53)]O3 – (0.925-x)Pb(Zn1/3Nb2/3)O3 – 0.075Pb(Mn1/3Nb2/3)O3 + 0.7%wt Li2CO3 (PZT-PZN-PMnN) ceramics, where x = 0.65 ¸ 0.90, has been prepared by two-stage calcinations method. The effect of the PZT content on structure and electrical properties of ceramic samples have been investigated. Experimental results showed that all samples have pure perovskite phase with tetragonal structure, the c/a ratio increases with increasing of PZT content. At x = 0.80, electical properties of ceramics are optimal: the density (r) of 7.81 g/cm3, the electromechanical coupling factor (kp) of 0.58, the dielectric constant (εr) of 1230, the dielectric loss (tand) of 0.005, the mechanical quality factor (Qm) of 1034 and the remanent polarization (Pr) of 27mC/cm2, which makes it as a promising material for high power piezoelectric devices.
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