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Flexoelectric effect in non-homogenous dielectrics

Authors: Serrahima i Serra, Sergi;

Flexoelectric effect in non-homogenous dielectrics

Abstract

Flexoelectricity is a different electromechanical coupling without this material symmetry limitations, hence universal for all dielectrics. Flexoelectricity relies on symmetry breaking beyond the material chemistry by either boundary conditions (bending, torsion), topology (architected metamaterials), the combination of multiple materials (composites) or surface effects (surface relaxation, surface instabilities in soft materials). In the present work, we explore a different symmetry-breaking mechanism, namely graded material properties. As in functionally graded materials, the sought-after property is the symmetry-breaking gradient itself. Apropos this goal, we extend the continuum mathematical and computational model for flexoelectricity and its implementation developed in the research group to account for continuously varying mechanical and electrical properties. The research made aims at finding an additional alternative to lead-based piezoceramics used nowadays. The studied linearly varying gradations show promising results with effective piezoelectric properties laying only an order of magnitude below the best piezoelectrics such as PZT and BaTiOFlexoelectricity is a different electromechanical coupling without this material symmetry limitations, hence universal for all dielectrics. Flexoelectricity relies on symmetry breaking beyond the material chemistry by either boundary conditions (bending, torsion), topology (architected metamaterials), the combination of multiple materials (composites) or surface effects (surface relaxation, surface instabilities in soft materials). In the present work, we explore a different symmetry-breaking mechanism, namely graded material properties. As in functionally graded materials, the sought-after property is the symmetry-breaking gradient itself. Apropos this goal, we extend the continuum mathematical and computational model for flexoelectricity and its implementation developed in the research group to account for continuously varying mechanical and electrical properties. The research made aims at finding an additional alternative to lead-based piezoceramics used nowadays. The studied linearly varying gradations show promising results with effective piezoelectric properties laying only an order of magnitude below the best piezoelectrics such as PZT and BaTiO.

Country
Spain
Keywords

B-Spline Method, Mathematical models, Piezoelectricity, flexoelectricity, non-homogeneous material, Models matemàtics, Dielectrics, mathematical modelling, Dielèctrics, Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures, Piezoelectricitat

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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