Barium-chromium oxide (BaCrOx) coated Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) tubular membranes were successfully prepared and evaluated for oxygen separation applications under high pressure-temperature conditions. The oxygen permeation flux was measured in accordance with the temperature, air pressure, and retentate flow rate, ranging from 750-950 degrees C, 3-9 atm, and 200-1000 mL/min, respectively. The permeation testing on the BaCrOx coated BSCF tubular membranes showed that the oxygen flux increased as the temperature, pressure, and retentate flow rate increased. The oxygen permeation flux was 5.7 mL/(min cm(2)) with temperature, pressure, and retentate flow rate of 900 degrees C, 9 atm, and 1000 mL/min, respectively. The temperature dependence of the oxygen permeation process is further investigated, and the Arrhenius pre-exponential factor, as well as the apparent activation energy, is determined.