Abstract
A series of double layered perovskites, PrBaCo2−xFexO5+δ (x=0, 0.2, 0.5, 1, 1.5, and 2), are successfully prepared employing a solid state reaction. The effects of Fe substitution on the crystal structure and oxygen transport properties of PrBaCo2O5+δ were investigated by X-ray diffraction and oxygen permeation experiments. X-ray diffraction patterns confirm that PrBaCo2O5+δ, PrBaCo1.8Fe0.2O5+δ, PrBaCo1.5Fe0.5O5+δ, and PrBaFe2O5+δ exhibit an orthorhombic perovskite structure, while PrBaCoFeO5+δ, and PrBaCo0.5Fe1.5O5+δ crystallize in a cubic perovskite. The oxygen permeation flux of PrBaCo2−xFexO5+δ is found to decrease with increasing Fe content. Among the compositions, PrBaCo2O5+δ shows the highest oxygen permeation flux of 1.89×10−7molcm−2s−1 at 900°C under an air/helium atmosphere.
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