EFFECT OF MnO2 ADDITION ON DIELECTRIC, FERROELECTRIC AND PIEZOELECTRIC PROPERTIES OF PLZT- PZN CERAMICS
Abstract
The Pb0.99La0.01[(Zn1/3Nb2/3)0.35-(Zr0.47Ti0.53)0.65]O3 + x wt% MnO2 ceramics has been prepared using the columbite precursor method and conventional method. The effect of MnO2 content on the crystal structure and dielectric, ferroelectric, piezoelectric properties has been investigated. Experimental results indicated that MnO2 doping changed the structure and the dielectric, piezoelectric and ferroelectric properties of the ceramics. As MnO2 content increases, the crystal structure changes from tetragonal to rhombohedral. The electromechanical coupling factor (kp), the piezoelectric constant (d31) and the mechanical quality factor (Qm) increase and reach the highest value at 0.5 wt% MnO2 content, while dielectric loss tand has minimum value at this content. The morphotropic phase boundary (MPB) of MnO2-doped PLZT–PZN ceramics occurs at the content of 0.5 wt% MnO2. At this MnO2 content, the ceramics has the optimal electromechanical properties, kp = 0.52, kt = 0.42, d31 = 76 pC/N, Qm = 1049, tand = 0.003, which makes it a promising material for high power piezoelectric devices.
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