Highly permeable La0.2Ba0.8Co0.8Fe0.2−xZrxO3−δ membranes for oxygen separation

A highly oxygen-permeable membrane was produced by substituting Zr for Fe through the solid-state reaction in the nominal La0.2Ba0.8Co0.8Fe0.2O3−δ composition. In the temperature range of 700–1000 °C, the La0.2Ba0.8Co0.8Fe0.2−xZrxO3−δ membrane with x = 0.05 had a remarkably high permeation flux because of the oxygen-vacancy-disordered structure of the membrane. For La0.2Ba0.8Co0.8Fe0.2O3−δ and La0.2Ba0.8Co0.8Fe0.175Zr0.025O3−δ, it was believed that the structure of the membranes changed from the oxide vacancy disordered to the ordered at approximately 920 °C. For La0.2Ba0.8Co0.8Fe0.15Zr0.05O3−δ, the change took place below 700 °C.