Interrelation of domain wall contributions to dielectric, piezoelectric and mechanical properties of a ferroic layer composite sample

TL;DR

This paper develops theoretical formulas for the interrelated contributions of domain walls to dielectric, piezoelectric, and mechanical properties in ferroic composites, validated by experimental measurements across temperature ranges.

Contribution

It introduces a generalized theoretical model for domain wall contributions in ferroic composites, including intrinsic piezoelectricity, and compares predictions with experimental data.

Findings

Theoretical formulas match experimental data across temperature ranges.

Domain wall contributions are interrelated similarly to thermodynamic relations.

Model accounts for geometric and material parameters of composites.

Abstract

Interrelations of domain wall (extrinsic) contributions to dielectric, piezoelectric and mechanical properties of ferroic samples are a hot subject of both theoretical and experimental research. Recently,we have derived theoretical formulas for such contributions, using model of composite layer sample: central single-crystal ferroelectric-ferroelastic layer, isolated from electrodes by passive layers. Here we present more general results, discussing the dependence of the contributions on geometric and material parameters of the composite and including in a special case intrinsic piezoelectricity. We also discuss the above-mentioned interrelation and compare our results with measurements of all the contributions on the same RDP sample in a wide temperature interval under the phase transition. It seems that both calculated and observed results remind of the so called Pippard-Janovec thermodynamic relations.