| Alternative title | Second harmonic generation investigation of symmetry breaking and flexoelectricity induced by nanoindentations in SrTiO3 |
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| DOI | Resolve DOI: https://doi.org/10.1002/adfm.201901266 |
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| Author | Search for: Kolhatkar, GitanjaliORCID identifier: https://orcid.org/0000-0003-0848-4751; Search for: Nicklaus, Mischa; Search for: Hadj Youssef, Azza; Search for: Cojocaru, Cristian1; Search for: Rivard, Maxime; Search for: Merlen, Alexandre; Search for: Légaré, François; Search for: Ruediger, Andreas |
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| Affiliation | - National Research Council of Canada. Automotive and Surface Transportation
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| Format | Text, Article |
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| Subject | flexoelectricity; nanoindentations; second harmonic generation; strontium titanate; symmetry breaking |
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| Abstract | Strain gradients induced by nanoindentations in bulk undoped strontium titanate (SrTiO₃) are investigated. After indenting a 850 nm deep pattern on the SrTiO₃ surface with a 8 GPa hardness and an 83 GPa indentation modulus by a Berkovich tip, the resulting deformation patterns are imaged by Raman spectroscopy and by second harmonic generation microscopy. Cross-shaped compressively stressed regions along the cubic SrTiO₃ primary slip planes are observed. These zones relax toward the unstrained bulk material through localized strain gradients on a length scale of several microns. Second harmonic tomography reveals the reduction of the crystal's centrosymmetry in the vicinity of the crosslike features due to a strain gradient. These results indicate the appearance of flexoelectricity following the nanoindentation process due to the creation of an inhomogeneous strain. |
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| Publication date | 2019-09-03 |
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| Publisher | Wiley |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | bd274f2a-37b6-4bb2-bf19-93ad7b3a0f04 |
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| Record created | 2021-12-17 |
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| Record modified | 2021-12-17 |
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