%0 Journal Article
%A Ran, Ke
%A Zeng, Fanlin
%A Fischer, Liudmila
%A Baumann, Stefan
%A Meulenberg, Wilhelm Albert
%A Neuhaus, Kerstin
%A Mayer, Joachim
%T The in situ generated emerging phase inside dual phase oxygen transport membranes
%J Acta materialia
%V 234
%@ 1359-6454
%C Amsterdam [u.a.]
%I Elsevier Science
%M FZJ-2022-02262
%P 118034
%D 2022
%X The in situ generated emerging phase inside the dual-phase oxygen transport membranes (DP-OTMs) plays a crucial role in boosting the overall performance of DP-OTMs. However, its detailed structure and properties are still not fully understood. Utilizing advanced transmission electron microscopy (TEM) techniques, the emerging phase GdxCe1-xFeyCo1-yO3-δ (GCFCO) inside the CexGd1-xO2-δ-FeCo2O4 (CGO-FC2O) OTMs was successfully characterized at the atomic scale. The newly formed GCFCO is primarily surrounded by the CGO, and contributes to a significant reduction of non-solute segregation at the CGO grain boundaries. Electronic characteristics of the GCFCO shows a sensitive dependence on its chemical composition, including the valence state of Ce and Fe as well as the oxygen vacancies. Additional CGO-GCFCO interfaces were introduced, where almost intact crystal structures were observed with slight Gd and Co segregation ∼1 nm at the edges. Approaching the interface, on the CGO side, only a minimum drop of the Ce valence was determined. On the GCFCO side, mixed Ce3+ and Ce4+ are partially occupying the Gd sites, while Fe and Co valence stay constant until the edge. Our study provides novel insight into the phase information within CGO-FC2O composites, which paves the path towards superior performance of various DP-OTMs
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000805863600001
%R 10.1016/j.actamat.2022.118034
%U https://juser.fz-juelich.de/record/907873