Polar nature of stress-induced twin walls in ferroelastic CaTiO3

A compressive uniaxial mechanical stress is applied on ferroelastic CaTiO3 (CTO), and a change in the domain structure is observed under a polarization microscope and a second harmonic generation (SHG) microscope. New twin walls (TWs) appear perpendicular to the original TWs under stress. The SHG mi...

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Veröffentlicht in:AIP advances 2017-08, Vol.7 (8), p.085315-085315-7
Hauptverfasser: Yokota, H., Niki, S., Haumont, R., Hicher, P., Uesu, Y.
Format: Artikel
Sprache:eng
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Zusammenfassung:A compressive uniaxial mechanical stress is applied on ferroelastic CaTiO3 (CTO), and a change in the domain structure is observed under a polarization microscope and a second harmonic generation (SHG) microscope. New twin walls (TWs) appear perpendicular to the original TWs under stress. The SHG microscope observations and analyses confirm that this type of stress-induced TWs is polar, similar to the original TWs, and is crystallographically prominent with monoclinic symmetry m. A quantitative estimation of this stress-induced effect reveals that CTO is hard ferroelastic in the sense that the TW movement requires a large stress. A possible application of this phenomenon is discussed.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4990608