Abstract
The morphotropic phase boundary (MPB) in the (0.85 − x)Pb(Zn1/3Nb2/3)O3 − 0.15BaTiO3 − xPbTiO3(0 < x < 0.2) ceramic system was delineated by x-ray diffraction analysis. Polarization hysteresis loop measurements at room temperature were performed for compositions in the vicinity of the MPB. Experimental results demonstrate that the MPB, by its definition the rhombohedral and tetragonal phase coexist in the present system, is a broad composition region where the value of x ranges from 0.12 to 0.18. The remanent polarization, Pr, increases with PbTiO3(PT) reaching a maximum value of 18 μC/cm2 at 15 mol%PT, then decreases remarkably with further PT addition, whereas the variation of coercive field, Ec, with PT content shows the opposite trend. The effect of PT incorporation on Pr is more pronounced than on Ec. Correlation between the degree of lattice distortion, instead of the maximization of the polarization orientations inherent to both phases, and Pr is attained to account for the observed phenomenon. The dependence of Ec upon PT content, however, reflects the transition from typical relaxor ferroelectrics to weak normal ferroelectrics, as confirmed by the results of the dielectric measurement.
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