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

TL;DR

This study investigates how grain size affects electric-field induced structural changes and piezoelectric response in relaxor-ferroelectric based polymer-ceramic composites, revealing a non-monotonic response and grain size-dependent phase transformations.

Contribution

It provides the first correlation between ceramic grain size, poling-induced structural changes, and piezoelectric response in relaxor-ferroelectric composites.

Findings

Piezo-response varies non-monotonically with grain size.

Poling induces irreversible cubic-like to tetragonal phase transformation.

Structural changes depend on ceramic grain size.

Abstract

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