TY  - JOUR
AU  - Zeng, Fanlin
AU  - Malzbender, Jürgen
AU  - Baumann, Stefan
AU  - Krüger, Manja
AU  - Winnubst, Louis
AU  - Guillon, Olivier
AU  - Meulenberg, Wilhelm A.
TI  - Phase and microstructural characterizations for Ce0.8Gd0.2O2--FeCo2O4 dual phase oxygen transport membranes
JO  - Journal of the European Ceramic Society
VL  - 40
IS  - 15
SN  - 0955-2219
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2020-03026
SP  - 5646 - 5652
PY  - 2020
AB  - Dual phase oxygen transport membranes were prepared via solid state reaction at 1200 ℃. The sintered membranes were characterized via X-ray diffraction, back scattered electron microscopy and electron backscatter diffraction, and associated with image analysis and calculations to quantify phase compositions and microstructural features including volume fractions, grain sizes, and contiguity. The characterizations reveal a multi-phase system containing Ce1-xGdxO2-δ’ (x ≈ 0.1) (CGO10), and FeyCo3-yO4 (0.2 < y < 1.2) (FCO), CoO and Gd0.85Ce0.15Fe0.75Co0.25O3 (GCFCO) in the sintered membranes. In addition, a novel model is utilized to assess the evolution of the ambipolar conductivity with respect to microstructural features. Both experimental and calculated results indicate that if the grain sizes of all phases in the composites are similar, the optimal ambipolar conductivity is reached with a volume ratio of ionic conducting phase to electronic conducting phase close to 4:1. Meanwhile, the GCFCO phase dominates the effective electronic conductivity.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000564729500001
DO  - DOI:10.1016/j.jeurceramsoc.2020.06.035
UR  - https://juser.fz-juelich.de/record/878726
ER  -