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Local crystal symmetry and structure at CaTiO3 twin boundaries

Authors :
Kenji Tsuda
Daisuke Morikawa
Source :
Applied Physics Letters. 118:092901
Publication Year :
2021
Publisher :
AIP Publishing, 2021.

Abstract

The local crystal symmetry and crystal structure at CaTiO3 twin boundaries were examined using convergent-beam electron diffraction (CBED). CBED patterns obtained right at the twin boundaries exhibited one mirror symmetry not observed in the bulk form. Two types of crystal structures were identified at the boundaries on different boundary widths and symmetry breaking. Quantitative analysis using CBED patterns revealed atomic shifts of Ti and Ca. A distortion of oxygen octahedra was also produced, which was smaller than the corresponding distortion obtained in the bulk form. The refined crystal structure conforms to the polar structure expected only at CaTiO3 twin boundaries.

Details

ISSN :
10773118 and 00036951
Volume :
118
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........f3460edb04add7d87564665008ca34dc
Full Text :
https://doi.org/10.1063/5.0043851