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Abstract
Electric fatigue properties and microstructures of Ca-modified lead titanate (Pb1−xCaxTiO3) ceramics were investigated using polarization-electric field measurements and transmission electron microscopy. Specimens show an extraordinary increasing in remanent the polarization after switching up to 106 cycles for specimens with certain compositions. The coercive fields of specimens with different Ca content exhibit different behavior. The x=0.5 specimens show a decreasing in the coercive field when cyclically loaded. The x=0.4 specimen just shows a decrease and then an increase in Ec while the coercive field of the x=0.3 specimens reveals an increasing trend. Microstructural investigations indicate that when the c/a ratio is large, intersecting domain boundaries are induced under repeated application of electric field. On the other hand, when x=0.5, the number of domain boundaries does not increase significantly, suggesting that domain boundary mobility is higher for Pb0.5Ca0.5TiO3 specimens.