Morphotropic phase boundary

In the last few years, search for lead free piezoelectric materials become indispensable due to hazards of lead (Pb) based piezoelectric materials for human health and environmental concern. Among the few lead free piezoelectric materials available, solid solution based on Bi0.5Na0.5TiO3 (BNT) with a morphotropic phase boundary (MPB) is considered as potential candidate for replacing PZT [1-3]. BNT is a promising lead free piezoelectric material, used as actuators and transducers [4,5], for the alternative of currently used PbZr1-xTixO3 (PZT). BNT is a kind of A-site complex ions perovskite with rhombohedral symmetry at room temperature. BNT shows strong ferroelectricity with a high remnant polarization, coercive field and relatively high Curie temperature 320 ̊C [6, 7].

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