Ferroelectrics as Smart Mechanical Materials

descriptionPublicationkeyboard_double_arrow_right Article 21 Jul 2017 Spain English Publisher:WileyJournal:Advanced Materials, volume 29 (issn: 0935-9648, eissn: 1521-4095,

Copyright policy )Funded by:EC | FLEXOELECTRICITY

Authors: Cordero Edwards, Kumara; Domingo Marimon, Neus; Abdollahi Hosnijeh, Amir; Sort Viñas, Jordi; Catalan, Gustau;

doi: 10.1002/adma.201702210

pmid: 28730658

handle: 2117/108844

Ferroelectrics as Smart Mechanical Materials

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Abstract

The mechanical properties of materials are insensitive to space inversion, even when they are crystallographically asymmetric. In practice, this means that turning a piezoelectric crystal upside down or switching the polarization of a ferroelectric should not change its mechanical response. Strain gradients, however, introduce an additional source of asymmetry that has mechanical consequences. Using nanoindentation and contact‐resonance force microscopy, this study demonstrates that the mechanical response to indentation of a uniaxial ferroelectric (LiNbO3) does change when its polarity is switched, and use this mechanical asymmetry both to quantify its flexoelectricity and to mechanically read the sign of its ferroelectric domains.

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Keywords

Field theory (Physics), Ferroelectric memories, :Matemàtiques i estadística::Anàlisi numèrica::Modelització matemàtica [Àrees temàtiques de la UPC], Ferroelectricity, :74 Mechanics of deformable solids::74B Elastic materials [Classificació AMS], Camps, Elasticitat, :Matemàtiques i estadística::Matemàtica aplicada a les ciències [Àrees temàtiques de la UPC], Mechanical properties, :74 Mechanics of deformable solids::74E Material properties given special treatment [Classificació AMS], Elasticity, Mechanical reading polarity, Flexoelectricity, Classificació AMS::74 Mechanics of deformable solids::74E Material properties given special treatment, Àrees temàtiques de la UPC::Matemàtiques i estadística::Matemàtica aplicada a les ciències, Teoria dels (Física), Classificació AMS::74 Mechanics of deformable solids::74B Elastic materials, :70 Mechanics of particles and systems::70S Classical field theories [Classificació AMS], Àrees temàtiques de la UPC::Matemàtiques i estadística::Anàlisi numèrica::Modelització matemàtica, Strength of materials, Camps, Teoria dels (Física), Resistència de materials, Classificació AMS::70 Mechanics of particles and systems::70S Classical field theories

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