Direct Observation of Huge Flexoelectric Polarization around Crack Tips.

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ID: 84246
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.
Reference Key
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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