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

被引：5

作者：

Harbola, Varun ^{[1
,2
]}

Pesquera, David ^{[3
,4
,5
]}

Xu, Ruijuan ^{[2
,6
,7
]}

Ashby, Paul D. ^{[8
]}

Martin, Lane W. ^{[3
,9
,10
,11
,12
,13
]}

Hwang, Harold Y. ^{[2
,6
]}

机构：

[1] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[2] Stanford Inst Mat & Energy Sci, SLAC Natl Lab, Menlo Pk, CA 94025 USA

[3] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[4] CSIC, Catalan Inst Nanosci & Nanotechnol, ICN2, Campus UAB, Barcelona 08193, Spain

[5] BIST, Campus UAB, Barcelona 08193, Spain

[6] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[7] North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27606 USA

[8] Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94720 USA

[9] Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA

[10] Rice Univ, Dept Mat Sci, Houston, TX 77005 USA

[11] Rice Univ, Dept Nanoengn Chem, Houston, TX 77005 USA

[12] Rice Univ, Dept Phys & Astron, Houston, TX USA

[13] Rice Univ, Rice Adv Mat Inst, Houston, TX 77005 USA

来源：

NANO LETTERS | 2024年 / 24卷 / 33期

基金：

美国国家科学基金会;

关键词：

Oxides; Ferroelectric; Nanomechanics; Flexoelectricity; Nonlinear elasticity; TITANATE; POLARIZATION; CONSTANTS; MODULUS;

D O I：

10.1021/acs.nanolett.4c02946

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：10331 / 10336

页数：6

共 46 条

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