Abstract
Lead-free sodium bismuth titanate-based (NBT) non-MPB solid solutions for different substitutions were synthesized by solid-state reaction method and their structural relation with ferroelectric and piezoelectric properties were analyzed. Extrinsic contribution to piezoelectric coefficient more particularly non-180° domain reorientation was facilitated by enhanced mobility. Minimum strain and low rhombohedral lattice distortion improves mobility and increases the piezoelectric coefficient which in turn enhances remnant polarization and reduces coercive field. Regarding substitution in NBT, as a rule of thumb, substitution of high polarisable ion in the A-site and low polarisable ion in the B-site enhances the piezoelectric coefficient in non-MPB NBT-based systems.
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