Polar nature of stress-induced twin walls in ferroelastic CaTiO3 | Zendy

Hiroko Yokota | Zendy; Shigeru Niki | Zendy; R. Haumont | Zendy; Patrick Hicher | Zendy; Yoshiaki Uesu | Zendy

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Polar nature of stress-induced twin walls in ferroelastic CaTiO3

Author(s) -

Hiroko Yokota,

Shigeru Niki,

R. Haumont,

Patrick Hicher,

Yoshiaki Uesu

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4990608

Subject(s) - crystal twinning , materials science , optical microscope , second harmonic generation , stress (linguistics) , perpendicular , ferroelasticity , condensed matter physics , polarization (electrochemistry) , microscope , monoclinic crystal system , piezoelectricity , ferroelectricity , crystallography , optics , chemistry , crystal structure , scanning electron microscope , composite material , physics , geometry , dielectric , microstructure , optoelectronics , mathematics , laser , linguistics , philosophy

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

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