The preparation and oxygen permeability of calcium-doped Ba–Sr–Ca–Co–Fe–O perovskite material

Calcium-doped Ba0.33Sr0.33Ca0.33Co0.8Fe0.2O3−δ perovskite material was successfully synthesized via a modified sol–gel method. The phase structure, surface morphology and oxygen permeation properties of Ba0.33Sr0.33Ca0.33Co0.8Fe0.2O3−δ were investigated in detail based on XRD, SEM and oxygen permeation test. The experimental results show that the synergistic effect of Ba2+/Sr2+/Ca2+ can obviously improve calcium doping content in A-site lattice and maintain pure cubic perovskite phase. The Arrehenius plot showed that the order-disorder transition for Ba0.33Sr0.33Ca0.33Co0.8Fe0.2O3−δ occurs around 700 °C which is lower than other similar materials doped with two metal ions. Oxygen permeation test indicates that maximum oxygen flux through Ba0.33Sr0.33Ca0.33Co0.8Fe0.2O3−δ membrane reaches up to 1.5 ml min−1 cm−2 at 950 °C which display a promising oxygen permeability.