Journal article
Fast mass interdiffusion in ceria/alumina composite
Department of Energy Conversion and Storage, Technical University of Denmark1
Ceramic Engineering & Science, Department of Energy Conversion and Storage, Technical University of Denmark2
Mixed Conductors, Department of Energy Conversion and Storage, Technical University of Denmark3
Electrofunctional materials, Department of Energy Conversion and Storage, Technical University of Denmark4
Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark5
Nuclear and Energy Research Institute6
Gadolinium-doped ceria (CGO) presents unique processes at low oxygen partial pressure (pO2 < 1012 atm) and low temperatures (T > 800 C) such as faster mass diffusion, which are not observed in conventional sintering under ambient air conditions. In CGO/Al2O3 composites the resulting effects driven by such mass diffusion are low viscosity flows and high reactivity between phases, indicated by the formation of CeAlO3.
This reaction is promoted by the high content of oxygen defects and the chemical reduction of Ce4+ cations to Ce3+ in CGO/Al2O3 composites under low temperature and low pO2. In this work, a comparison is made between sintering CGO/Al2O3 under ambient air conditions and under low pO2, focusing on densification, viscosity and the evolution of the microstructure.
Language: | English |
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Year: | 2015 |
Pages: | 17135-17143 |
ISSN: | 20507496 and 20507488 |
Types: | Journal article |
DOI: | 10.1039/c5ta02416a |
ORCIDs: | Teocoli, Francesca , Thydén, Karl Tor Sune and Esposito, Vincenzo |