Thermal Stability and Oxygen Separation Properties of SrCo_(0.8)Fe_(0.2)O_(3-δ) and SrCo_(0.8)Fe_(0.1)Sn_(0.1)O_(3-δ) Ceramic Membranes

The phase composition, thermal shocking resistance and the separating properties of both SrCo0.8Fe0.2O3-δ(SCF) and SrCo0.8Fe0.1Sn0.1O3-δ(SSCF) membranes were investigated systematically. It was found the as prepared SCF had long-term phase stability, and the SSCF had the composite feature with dual phase composition. As compared with the SCF, the SSCF had a more promoted thermal shocking resistance, which related to the decreasing of thermal expansion coefficient of it in comparison with the former. Furthermore, a permeation rate of 1.87×10-6mol·2cm-2·s-1 was obtained on the as-prepared SCF membrane at 1000℃and under oxygen partial pressure gradient of the Po2(h)/Po2(1)=0.209atm/0.012atm, and at the same measuring condition, the permeability was 2.49×10-6mol·cm-2·s-1 for the as prepared SSCF one.