The origin of the change in ferroelectric properties of Ba0.6Sr0.4TiO3 (BST60) ceramics near Curie temperature due to the application of an electric field was investigated by using Raman scattering spectroscopy. The results showed that different structural responses were induced upon electric fields (E). The relative intensity ratio between the vibrating modes of A1(TO3) and E(TO4) was attributed to the structural phase transitions induced by the electric field E. The increase in degree of structural distortion with increasing E was in a good agreement with the gradual shift in Curie point to higher temperature. These electric-field-induced structural effects contributed significantly to the tunability of the BST60 ceramics. These conclusion should be also applicable to other ferroelectric materials.
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Zhang et al. (2012) studied this question.
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