Results 41 to 50 of about 4,906 (246)

The origins of electromechanical indentation size effect in ferroelectrics

, 2009
Metals exhibit a size-dependent hardening when subject to indentation. Mechanisms for this phenomenon have been intensely researched in recent times. Does such a size-effect also exist in the electromechanical behavior of ferroelectrics?--if yes, what ...
Gharbi, M., Sharma, P., Sun, Z. H., White, K.   +3 more
core   +1 more source

Controlled manipulation of oxygen vacancies using nanoscale flexoelectricity [PDF]

, 2017
Oxygen vacancies, especially their distribution, are directly coupled to the electromagnetic properties of oxides and related emergent functionalities that have implication in device applications.
Cao, Ye, Chen, Long-Qing, Cho, Myung Rae, Das, Saikat, Kalinin, Sergei V., Kim, Minu, Noh, Tae Won, Shin, Yeong Jae, Wang, Bo, Wang, Lingfei, Yang, Sang Mo   +10 more
core   +3 more sources

Quantum Flexoelectricity in Low Dimensional Systems

, 2007
Symmetry breaking at surfaces and interfaces and the capability to support large strain gradients in nanoscale systems enable new forms of electromechanical coupling.
A. G. Petrov, A. N. Cleland, R. E. Newnham, S. Datta, Sergei V. Kalinin, Vincent Meunier   +5 more
core   +1 more source

Strain gradient induced polarization in SrTiO3 single crystals

, 2007
Piezoelectricity is inherent only in noncentrosymmetric materials, but a piezoelectric response can also be obtained in centrosymmetric crystals if subjected to inhomogeneous deformation. This phenomenon, known as flexoelectricity, affects the functional
A. Buckley, G. Catalan, J. F. Scott, J. Petzelt, L. D. Landau, P. R. L. Welche, P. Zubko, S. M. Kogan, V. S. Mashkevich, V. S. Mashkevich, W. Ma   +10 more
core   +1 more source

Hidden symmetry of flexoelectric coupling [PDF]

Physical Review B, 2018
Considering the importance of the flexoelectric coupling for the physical understanding of the gradient-driven couplings in mesoscale and nanoscale solids, one has to determine its full symmetry and numerical values. The totality of available experimental and theoretical information about the flexocoupling tensor symmetry (specifically the amount of ...
Eliseev, Eugene A., Morozovska, Anna N.
openaire   +2 more sources

Origin Of the enhanced flexoelectricity of relaxor ferroelectrics [PDF]

, 2013
We have measured the bending-induced polarization of Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals with compositions at the relaxor-ferroelectric phase boundary.
Bursian E. V., Gustau Catalan, Jackeline Narvaez, Jaffe B., Kogan S. M.   +4 more
core   +2 more sources

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 Viñas, Jordi, Catalan, Gustau   +4 more
openaire   +6 more sources

Dynamic flexoelectric effect in perovskites from first principles calculations

, 2015
Using the dynamical matrix of a crystal obtained from ab initio calculations, we have evaluated for the first time the strength of the dynamic flexoelectric effect and found it comparable to that of the static bulk flexoelectric effect, in agreement with
Kvasov, Alexander, Tagantsev, Alexander K.   +1 more
core   +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

Flexoelectricity in oxide thin films

Journal of Advanced Dielectrics
Flexoelectric effect describes the electromechanical coupling between the strain gradient and its internal polarization in all dielectrics. Despite this universality, the resulting flexoelectric field remains small at the macroscopic level.
Guoyang Shen, Renhong Liang, Zhiguo Wang, Zhiyong Liu, Longlong Shu   +4 more
doaj   +1 more source