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ABSTRACT
Sr2-xBaxBi4Ti5O18 (SBBTi-x,x = 0∼2.0) ceramic samples were prepared by using the standard solid-state reaction method and their crystal structure, ferroelectric and dielectric properties were examined. The results show that the lattice constants increase with barium content. The remnant polarization (2P r ) and the coercive field (Ec) decrease with Ba-doping. As x = 0, they were 17.3 μ C/cm2 and 54 kV/cm, and in the case of x = 2.00, they are 0.3 μ C/cm2 and 1.8 kV/cm, respectively. As Ba content increases, the Curie temperature (T c) of the SBBTi-x decreases from 285°C to a minimum value of 150°C at x = 0.75, then increases and reaches 300°C at x = 2.00. As x < 0.75, Ba incorporation brings about the pronounced relaxor ferroelectric behavior.
ACKNOWLEDGMENTS
This work was supported by the financial support from the National Natural Science Foundation of China (Grant No. 10274066) and the Natural Science Foundation of Jiangsu Province, China (Grant No. BK2005052).