Flexoelectric Enhancement of Strain Gradient Elasticity Across a Ferroelectric-to-Paraelectric Phase Transition

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(Stanford University. Department of Physics)
Pesquera, David

(Institut Català de Nanociència i Nanotecnologia)
Xu, Ruijuan

(North Carolina State University. Department of Materials Science and Engineering)
Ashby, Paul D.

(Lawrence Berkeley National Lab. Molecular Foundry)
Martin, Lane W.

(University of California. Department of Materials Science and Engineering)
Hwang, Harold Y. (Stanford University. Department of Applied Physics)

Data:	2024
Resum:	We study the temperature dependent elastic properties of Ba0. 8Sr0. 2TiO3 freestanding membranes across the ferroelectric-to-paraelectric phase transition using an atomic force microscope. The bending rigidity of thin membranes can be stiffer compared to stretching due to strain gradient elasticity (SGE). We measure the Young's modulus of freestanding Ba0. 8Sr0. 2TiO3 drumheads in bending and stretching dominated deformation regimes on a variable temperature platform, finding a peak in the difference between the two Young's moduli obtained at the phase transition. This demonstrates a dependence of SGE on the dielectric properties of a material and alludes to a flexoelectric origin of an effective SGE.
Ajuts:	European Commission 797123 "la Caixa" Foundation 100010434 Agencia Estatal de Investigación CEX2021-001214-S
Drets:	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.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Oxides ; Ferroelectric ; Nanomechanics ; Flexoelectricity ; Non-linear elasticity
Publicat a:	Nano letters, Vol. 24, Issue 33 (August 2024) , p. 10331-10336, ISSN 1530-6992

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Registre creat el 2025-03-25, darrera modificació el 2025-09-19