Ceramic powders of an oxygen ion conductor such as apatite-type lanthanum silicate La_(9.83)Si_(4.5)Fe_(1.5)O_(26±δ) and a proton conductor such as BaZr_(0.8)Y_(0.2)O_(3±δ) were prepared by solid state chemistry. These single phased materials after powder processing were used in shape-forming by gel-casting into tubes of 5-14 cm length and 0.6-2 cm diameter. Powder properties were verified by XRD, SEM and laser particle size distribution analysis. In addition, rheological measurements were performed in order to report the viscosity of the slurries used for a successful shape-forming casting. Different sintering protocols were applied all leading to high porosity structures suitable for electrode supported electrochemical reactors even after sintering at 1500°C. The porosity of the produced tubes was evaluated by Archimedes method while the microstructure was studied by SEM.
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