Direct Visualization of Distorted Twin Boundaries in Ce-Doped GdFeO3

Ke Ran*, Juri Barthel, Lei Jin, Daesung Park, Annika Buchheit, Kerstin Neuhaus, Stefan Baumann, Wilhelm A. Meulenberg, Joachim Mayer

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

Utilizing advanced transmission electron microscopy (TEM), the structure at the (110)-type twin boundary (TB) of Ce-doped GdFeO3 (C-GFO) has been investigated with picometer precision. Such a TB is promising to generate local ferroelectricity within a paraelectric system, while precise knowledge about its structure is still largely missing. In this work, a direct measurement of the cation off-centering with respect to the neighboring oxygen is enabled by integrated differential phase contrast (iDPC) imaging, and up to 30 pm Gd off-centering is highly localized at the TB. Further electron energy loss spectroscopy (EELS) analysis demonstrates a slight accumulation of oxygen vacancies at the TB, a self-balanced behavior of Ce at the Gd sites, and a mixed occupation of Fe2+ and Fe3+ at the Fe sites. Our results provide an informative picture with atomic details at the TB of C-GFO, which is indispensable to further push the potential of grain boundary engineering.

Original languageEnglish
Pages (from-to)2945-2951
Number of pages7
JournalNano letters
Volume23
Issue number7
DOIs
Publication statusPublished - 12 Apr 2023

Keywords

  • n/a OA procedure
  • EELS
  • ferroelastic twin boundary
  • GdFeO
  • iDPC
  • STEM-HAADF
  • EDX

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