TY  - JOUR
AU  - Ran, Ke
AU  - Barthel, Juri
AU  - Jin, Lei
AU  - Daesung
AU  - Buchheit, Annika
AU  - Neuhaus, Kerstin
AU  - Baumann, Stefan
AU  - Meulenberg, Wilhelm Albert
AU  - Mayer, Joachim
TI  - Direct Visualization of Distorted Twin Boundaries in Ce-Doped GdFeO3
JO  - Nano letters
VL  - 23
IS  - 7
SN  - 1530-6984
CY  - Washington, DC
PB  - ACS Publ.
M1  - FZJ-2023-02767
SP  - 2945-2951
PY  - 2023
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - 36972518
UR  - <Go to ISI:>//WOS:000958097500001
DO  - DOI:10.1021/acs.nanolett.3c00318
UR  - https://juser.fz-juelich.de/record/1009338
ER  -