| Autre titre | Second harmonic generation investigation of symmetry breaking and flexoelectricity induced by nanoindentations in SrTiO3 |
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| DOI | Trouver le DOI : https://doi.org/10.1002/adfm.201901266 |
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| Auteur | Rechercher : Kolhatkar, GitanjaliIdentifiant ORCID : https://orcid.org/0000-0003-0848-4751; Rechercher : Nicklaus, Mischa; Rechercher : Hadj Youssef, Azza; Rechercher : Cojocaru, Cristian1; Rechercher : Rivard, Maxime; Rechercher : Merlen, Alexandre; Rechercher : Légaré, François; Rechercher : Ruediger, Andreas |
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| Affiliation | - Conseil national de recherches du Canada. Automobile et les transports de surface
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| Format | Texte, Article |
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| Sujet | flexoelectricity; nanoindentations; second harmonic generation; strontium titanate; symmetry breaking |
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| Résumé | 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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| Date de publication | 2019-09-03 |
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| Maison d’édition | Wiley |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | bd274f2a-37b6-4bb2-bf19-93ad7b3a0f04 |
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| Enregistrement créé | 2021-12-17 |
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| Enregistrement modifié | 2021-12-17 |
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