Large flexoelectric anisotropy in paraelectric Barium Titanate
Narvaez, Jackeline (Institut Català de Nanociència i Nanotecnologia)
Saremi, Sahar (Institut Català de Nanociència i Nanotecnologia)
Hong, Jiawang (Oak Ridge National Laboratory. Materials Science and Technology Division)
Stengel, Massimiliano (Institut de Ciència de Materials de Barcelona)
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia)

Date:	2015
Abstract:	The bending-induced polarization of barium titanate single crystals has been measured with an aim to elucidate the origin of the large difference between theoretically predicted and experimentally measured flexoelectricity in this material. The results indicate that part of the difference is due to polar regions (short-range order) that exist above TC and up to T∗≈200-225°C. Above T∗, however, the flexovoltage coefficient still shows an unexpectedly large anisotropy for a cubic material, with (001)-oriented crystals displaying 10 times more flexoelectricity than (111)-oriented crystals. Theoretical analysis shows that this anisotropy cannot be a bulk property, and we therefore interpret it as indirect evidence for the theoretically predicted but experimentally elusive contribution of surface piezoelectricity to macroscopic bending-induced polarization.
Grants:	European Commission 308023 Ministerio de Economía y Competitividad FIS2013-48668-C2-1-P Ministerio de Economía y Competitividad FIS2013-48668-C2-2-P Ministerio de Economía y Competitividad SEV-2013-0295
Rights:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Cubic materials ; Flexoelectricity ; Induced polarization ; Large anisotropy ; Macroscopic bending ; Oriented crystals ; Short range ordering ; Surface piezoelectricities
Published in:	Physical review letters, Vol. 115, Issue 3 (July 2015) , art. 37601, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.115.037601

Postprint 12 p, 363.5 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles