The origins of electromechanical indentation size effect in ferroelectrics
arXiv:0904.4909 · doi:10.1063/1.3231442
Abstract
Metals exhibit a size-dependent hardening when subject to indentation. Mechanisms for this phenomenon have been intensely researched in recent times. Does such a size-effect also exist in the electromechanical behavior of ferroelectrics?--if yes, what are the operative mechanisms? Our experiments on BaTiO3 indeed suggest an electromechanical size-effect. We argue, through theoretical calculations and differential experiments on another non-ferroelectric piezoelectric (Quartz), that the phenomenon of flexoelectricity(as opposed to dislocation activity) is responsible for our observations. Flexoelectricity is the coupling of strain gradients to polarization and exists in both ordinary and piezoelectric dielectrics. In particular, ferroelectrics exhibit an unusually large flexoelectric response.
in review
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Cited by in corpus (11)
- First-principles theory and calculation of flexoelectricity
- Does Flexoelectricity Drive Triboelectricity?
- Flexoelectric fracture-filter effect in ferroelectrics
- Flexocoupling impact on the generalized susceptibility and soft phonon modes in the ordered phase of ferroics
- Direct Observation of Large Flexoelectric Bending at the Nanoscale in Lanthanide Scandates
- Electric-field-tunable mechanical properties of relaxor ferroelectric single crystal measured by nanoindentation
- New multiferroics based on EuxSr1-xTiO3 nanotubes and nanowires
- Inverse flexoelectret effect: bending dielectrics by a uniform electric field
- Analytical method to determine flexoelectric coupling coefficient at nanoscale
- Magnetic Field Tunable Small-scale Mechanical Properties of Nickel Single Crystals Measured by Nanoindentation Technique
- Hidden Symmetry of Flexoelectric Coupling