Physics – Condensed Matter – Materials Science
Scientific paper
2007-02-13
Ferroelectrics: Vol. 290, Pgs. 124-131 (2003)
Physics
Condensed Matter
Materials Science
Revised version (simplified symbol notation)
Scientific paper
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.
Kopal Alena
Mokry Pavel
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