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Piezoelectric mimicry of flexoelectricity
dc.contributor.author | Abdollahi Hosnijeh, Amir |
dc.contributor.author | Vazquez Sancho, Fabian |
dc.contributor.author | Catalan, Gustau |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental |
dc.date.accessioned | 2018-12-07T09:12:21Z |
dc.date.available | 2018-12-07T09:12:21Z |
dc.date.issued | 2018-11-15 |
dc.identifier.citation | Abdollahi, A., Vazquez Sancho, F., Catalan, G. Piezoelectric mimicry of flexoelectricity. "Physical review letters", 15 Novembre 2018, vol. 121, núm. 20, p. 1-5. |
dc.identifier.issn | 0031-9007 |
dc.identifier.uri | http://hdl.handle.net/2117/125488 |
dc.description.abstract | The origin of “giant” flexoelectricity, orders of magnitude larger than theoretically predicted, yet frequently observed, is under intense scrutiny. There is mounting evidence correlating giant flexoelectriclike effects with parasitic piezoelectricity, but it is not clear how piezoelectricity (polarization generated by strain) manages to imitate flexoelectricity (polarization generated by strain gradient) in typical beam-bending experiments, since in a bent beam the net strain is zero. In addition piezoelectricity changes sign under space inversion but giant flexoelectricity is insensitive to space inversion, seemingly contradicting a piezoelectric origin. Here we show that, if a piezoelectric material has its piezoelectric coefficient asymmetrically distributed across the sample, it will generate a nonzero bending-induced polarization impossible to distinguish from true flexoelectricity even by inverting the sample. The effective flexoelectric coefficient caused by piezoelectricity is functionally identical to, and often larger than, intrinsic flexoelectricity: our calculations show that, for standard perovskite ferroelectrics, even a tiny gradient of piezoelectricity (1% variation of piezoelectric coefficient across 1 mm) is sufficient to yield a giant effective flexoelectric coefficient of 1 µC/m, three orders of magnitude larger than the intrinsic expectation value. |
dc.format.extent | 5 p. |
dc.language.iso | eng |
dc.publisher | American Institute of Physics (AIP) |
dc.subject | Àrees temàtiques de la UPC::Matemàtiques i estadística::Matemàtica aplicada a les ciències |
dc.subject.lcsh | Strength of materials |
dc.title | Piezoelectric mimicry of flexoelectricity |
dc.type | Article |
dc.subject.lemac | Resistència de materials |
dc.contributor.group | Universitat Politècnica de Catalunya. LACÀN - Mètodes Numèrics en Ciències Aplicades i Enginyeria |
dc.identifier.doi | 10.1103/PhysRevLett.121.205502 |
dc.description.peerreviewed | Peer Reviewed |
dc.subject.ams | Classificació AMS::74 Mechanics of deformable solids::74P Optimization |
dc.relation.publisherversion | https://link.aps.org/doi/10.1103/PhysRevLett.121.205502 |
dc.rights.access | Open Access |
local.identifier.drac | 23517961 |
dc.description.version | Postprint (author's final draft) |
dc.relation.projectid | info:eu-repo/grantAgreement/EC/FP7/308023/EU/Flexoelectricity/FLEXOELECTRICITY |
local.citation.author | Abdollahi, A.; Vazquez Sancho, F.; Catalan, G. |
local.citation.publicationName | Physical review letters |
local.citation.volume | 121 |
local.citation.number | 20 |
local.citation.startingPage | 1 |
local.citation.endingPage | 5 |
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