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The last 10 years an alternative production route for oxygen production by using mixed conductors has been investigated. Perovskite mixed electron-oxygen conducting membranes are bulk membranes with a thickness of the order of 1 mm, showing sufficient oxygen fluxes only at temperatures above 800 o C. To reach commercially interesting fluxes at lower temperatures, membrane modules with a much...
The effect of calcium substitution on the structure and electrical conductivity of Ln2−xCaxBaZnO5−δ, Ln=La and Nd, has been studied. Differing trends with respect to dependence of the unit cell volume were observed as a function of Ca substitution. For both series of materials the limit of Ca substitution was estimated to be x≈0.2. The electrical conductivity was studied in the temperature range of...
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