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Polymer-piezoceramic 0-3 composites combine the flexibility of the polymersand the excellent piezoelectric properties of the ferroelectric based ceramic.While grain size of the ceramic powder is one of the important considerationsin the fabrication of such composites, a correlation relating poling fieldinduced structural changes and its possible influence on the overallpiezoelectric response of the composite is still lacking. In this paper, weexamine this issue on a 0-3 piezo-composite comprising of a ceramic powders ofa low-lead piezoelectric alloy (x)Bi(Ni1/2Zr1/2O3-(1-x)PbTiO3 in proximity ofits morphotropic phase boundary, and polyvinylidene fluoride (PVDF) as thepolymer component. Composites were fabricated by fixing the volume fraction ofthe ceramic while varying the grain size. We found a non-monotonic variation inthe piezo-response as a function of grain size. Structural analysis before andafter poling of the piezo-composites revealed evidence of poling inducedcubic-like to tetragonal irreversible transformation, the extent of which isdependent on the grain size.

Grain-size dependent electric-field induced structural changes in relaxor-ferroelectric based unclamped piezoelectric grains