Abstract
[Formula: see text][Formula: see text]TiO3-based lead-free piezoelectrics are considered for potential replacement of the lead-based commercial piezoceramics in high-power transducer applications. We have examined the role of grain size in influencing the structural-polar inhomogeneity of stoichiometric and off-stoichiometric [Formula: see text][Formula: see text]TiO3 (NBT), and its morphotropic-phase-boundary (MPB) derivative 0.94[Formula: see text][Formula: see text]TiO3-0.06BaTiO3 (NBT-6BT). Our study reveals that size effect comes into play in these systems on a very large length scale (on the scale of microns) considerably affecting its global structure and properties.
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