%0 Journal Article
%A Ran, Ke
%A Barthel, Juri
%A Jin, Lei
%A Daesung
%A Buchheit, Annika
%A Neuhaus, Kerstin
%A Baumann, Stefan
%A Meulenberg, Wilhelm Albert
%A Mayer, Joachim
%T Direct Visualization of Distorted Twin Boundaries in Ce-Doped GdFeO3
%J Nano letters
%V 23
%N 7
%@ 1530-6984
%C Washington, DC
%I ACS Publ.
%M FZJ-2023-02767
%P 2945-2951
%D 2023
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 36972518
%U <Go to ISI:>//WOS:000958097500001
%R 10.1021/acs.nanolett.3c00318
%U https://juser.fz-juelich.de/record/1009338