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Title: Direct Observation of Large Flexoelectric Bending at the Nanoscale in Lanthanide Scandates

Journal Article · · Nano Letters

There is a growing interest in the flexoelectric effect, since at the nanoscale it is predicted to be very large. However, there have been no direct observations of flexoelectric bending consistent with current theoretical work that implies strains comparable to or exceeding the yield strains of typical materials. In this work, we show a direct observation of extraordinarily large, two-dimensional reversible bending at the nanoscale in dysprosium scandate due to the converse flexoelectric effect, with similar results for terbium and gadolinium scandate. Within a transmission electron microscope, thin features bend up to 90° with radii of curvature of about 1 μm, corresponding to very large nominal strains. Analysis including independent experimental determination of the flexoelectric coefficient is semiquantitatively consistent with interpreting the results as due to flexoelectricity. These results experimentally demonstrate large flexoelectric bending at the nanoscale.

Research Organization:
Northwestern Univ., Evanston, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-01ER45945
OSTI ID:
1469325
Journal Information:
Nano Letters, Vol. 18, Issue 6; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Cited By (3)

Does Flexoelectricity Drive Triboelectricity? journal September 2019
Controlled Two-Step Formation of Faceted Perovskite Rare-Earth Scandate Nanoparticles journal April 2019
Thickness-Dependent Perovskite Octahedral Distortions at Heterointerfaces journal May 2019

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