Results 1 to 10 of about 554 (138)

Flexoelectric Fracture-Ratchet Effect in Ferroelectrics [PDF]

Physical Review Letters, 2019
The propagation front of a crack generates large strain gradients and it is therefore a strong source of gradient-induced polarization (flexoelectricity). Herein, we demonstrate that, in piezoelectric materials, a consequence of flexoelectricity is that crack propagation is helped or hindered depending on whether it is parallel or antiparallel to the ...
Cordero-Edwards, Kumara, Kianirad, Hoda, Canalias, Carlot, Sort, Jordi, Catalan, Gustau   +4 more
openaire   +6 more sources

Analog modulation by the flexoelectric effect in liquid crystals [PDF]

Applied Optics, 2020
We have solved the long-standing problems of stability and hysteresis, and we are able to obtain the homogeneous uniform lying helix structure in polymer-free cholesteric liquid crystals. This is instrumental for the present work to demonstrate the analog modulation at high speed and high precision.
W. C. Yip, Chris Welch, Georg H. Mehl, Timothy D. Wilkinson   +3 more
openaire   +4 more sources

Flexoelectric effect modelling [PDF]

Opto-Electronics Review, 2008
AbstractA statistical theory of dipole flexoelectric (FE) polarization in liquid crystals is used to calculate temperature dependence of order parameters, elastic constants and FE coefficients. Two systems with polar wedge-shaped and banana-shaped molecules are investigated.
openaire   +2 more sources

Modelling the flexoelectric effect in solids: A micromorphic approach [PDF]

Computer Methods in Applied Mechanics and Engineering, 2020
Flexoelectricity is characterised by the coupling of the gradient of the deformation and the electrical polarization in a dielectric material. A novel micromorphic approach is presented to accommodate the resulting higher-order gradient contributions arising in this highly-nonlinear and coupled problem within a classical finite element setting.
McBride, Andrew, Davydov, Denis, Steinmann, Paul   +2 more
openaire   +2 more sources

Flexoelectric Effect in Solids

Annual Review of Materials Research, 2013
Flexoelectricity—the coupling between polarization and strain gradients—is a universal effect allowed by symmetry in all materials. Following its discovery several decades ago, studies of flexoelectricity in solids have been scarce due to the seemingly small magnitude of this effect in bulk samples.
Zubko Pavlo, Catalan Gustau, Tagantsev Alexander K.   +2 more
openaire   +3 more sources

Flexoelectric and piezoelectric effects in micro- and nanocellulose films

Carbohydrate Polymers, 2023
In this work, we evaluated the flexoelectric and piezoelectric contributions to the overall macroscopic polarization in cellulose films. To this end, the flexoelectric μ31 and transverse effective piezoelectric e31,f coefficients of cellulose films were determined using cantilever beam bending.
Trellu, Hanna, Le Scornec, Julien, Leray, Nadège, Moreau, Céline, Villares, Ana, Cathala, Bernard, Guiffard, Benoit   +6 more
openaire   +4 more sources

Flexoelectric effect in finite samples [PDF]

Journal of Applied Physics, 2012
Static flexoelectric effect in a finite sample of a solid is addressed in terms of phenomenological theory for the case of a thin plate subjected to bending. It has been shown that despite an explicit asymmetry inherent to the bulk constitutive electromechanical equations which take into account the flexoelectric coupling, there exists a situation ...
Tagantsev, Alexander K., Yurkov, Alexander S.   +1 more
openaire   +2 more sources

Flexoelectric Effect in Biaxial Nematics

Acta Physica Polonica A, 2012
The flexoelectric (FE) effect provides a linear coupling between electric polarization and orientational deformation in liquid crystals. It influences many electrooptical phenomena and it is used in some bistable nematic devices. A statistical theory of dipole FE polarization in biaxial nematic liquid crystals is used to calculate temperature ...
openaire   +2 more sources

Control of Polarization and Polar Helicity in BiFeO3 by Epitaxial Strain and Interfacial Chemistry

Advanced Functional Materials, EarlyView.
In BiFeO3 thin films, the interplay of interfacial chemistry, electrostatics, and epitaxial strain is engineered to stabilize homohelicity in polarization textures at the domain scale. The synergistic use of a Bi2O2‐terminated Aurivillius buffer layer and a highly anisotropic compressive epitaxial strain offers new routes to control the polar‐texture ...
Elzbieta Gradauskaite, Lilia Huynh, Natascha Gray, Quintin N. Meier, Marta D. Rossell, Morgan Trassin   +5 more
wiley   +1 more source

Flexoelectrically Induced Polar Topology in Twisted SrTiO3 Membranes

Advanced Materials, EarlyView.
Twisted SrTiO3 bilayers host polar vortices of flexoelectric origin, revealed through combined experiment and theory. By reconstructing polarization from the toroidal moment of strain gradients, the work establishes a 3D chiral state with broken inversion and mirror symmetries.
Isabel Tenreiro, Hugo Aramberri, Víctor Rouco, Gabriel Sánchez‐Santolino, Mariona Cabero, Fernando Gallego, David Sánchez‐Manzano, José M. González‐Calbet, Federico Mompeán, Mar García‐Hernández, Alberto Rivera‐Calzada, Jorge Íñiguez‐González, Carlos León, Jacobo Santamaría   +13 more
wiley   +1 more source