Oxygen permeation and electrical transport of Gd1−xPrxBaCo2O5+δ dense membranes

Abstract: Double-perovskite Gd1−x Pr x BaCo2O5+ δ membranes showed appreciable oxygen permeability at moderate temperatures. The overall oxygen permeation process of GdBaCo2O5+ δ was found to be controlled mainly by the bulk diffusion step with the membrane thickness larger than 0.8 mm, and the limitation by oxygen surface exchange came into play at reduced thickness of 0.8 mm. The electrical conductivity measurement showed Gd1– x Pr x BaCo2O5+ δ samples possessed a semiconducting behavior at a wide temperature range below 300 °C and a metallic behavior at 300–850 °C with a high conductivity of nearly 103 S cm−1. [Copyright &y& Elsevier]