A systemic study was performed on bismuth strontium titanate (Sr1−1.5xBixTiO3, 0.04⩽x⩽0.25) ceramics. Dielectric properties were measured from 83to373K at different frequencies. A transformation from relaxor ferroelectrics to relaxor behavior was observed when x>0.10. Both diffuseness and relaxation degree increase as x rises. Tunability was found to increase with increasing x value until 0.07, and then decrease when Bi3+ content increases. Meanwhile, their figures of merit (defined as tunability/loss) shows a maximum at x=0.12. The change from relaxor ferroelectrics into relaxor behavior has a positive impact on the tunability of bismuth strontium titanate system.
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Chen et al. (2007) studied this question.
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