Direct Observation of Huge Flexoelectric Polarization around Crack Tips.

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2020
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Abstract
Flexoelectricity is especially relevant for nanoscale structures, and it is expected to be largest at the tip of cracks. We demonstrate the presence of a huge flexoelectric polarization at crack tips in SrTiO by direct observation with scanning transmission electron microscopy. We observe an averaged polarization of 62 ± 16 μC cm in the three unit cells adjacent to the crack tip, which is one of the largest flexoelectric polarizations ever reported. The polarization is screened by an electron density of 0.7 ± 0.1 e/uc localized within one unit cell. These findings reveal the relevance of flexoelectricity for the science of crack formation and propagation.
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wang2020directnano Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Wang, Hongguang;Jiang, Xijie;Wang, Yi;Stark, Robert W;van Aken, Peter A;Mannhart, Jochen;Boschker, Hans;
Journal Nano letters
Year 2020
DOI
10.1021/acs.nanolett.9b03176
URL
Keywords
transmission electron microscopy flexoelectricity crack tips strain gradient

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