Journal
APPLIED PHYSICS EXPRESS
Volume 9, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.7567/APEX.9.071501
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Funding
- JSPS KAKENHI [25287068]
- Grants-in-Aid for Scientific Research [25287068] Funding Source: KAKEN
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Nanometer-scale local structures of the cubic phase of barium titanate (BaTiO3) are investigated by convergent-beam electron diffraction (CBED) using a nanometer-size electron probe. Breaking of the cubic symmetry has been discovered in the nanometer-scale areas of the cubic phase. This indicates the existence of local polarization clusters as a precursor of the phase transition. Symmetry- breaking index maps for the fourfold rotation symmetry are given at different temperatures with the combined use of scanning transmission electron microscopy and CBED methods (STEM-CBED). A spatially hierarchical structure of the cubic phase is proposed, which may explain different local symmetries reported using different experimental probes. (C) 2016 The Japan Society of Applied Physics
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