Direct observation of the symmetry breaking of the nanometer-scale local structure in the paraelectric cubic phase of BaTiO3 using convergent-beam electron diffraction

Kenji Tsuda, Michiyoshi Tanaka

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10 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number071501
JournalApplied Physics Express
Volume9
Issue number7
DOIs
Publication statusPublished - 2016 Jul

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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