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SrCo 1x Fe x O 3 -δ solid solutions with 0.3 ≤ x ≤ 0.9 are shown to have the cubic perovskite structure. The unit-cell parameter and volume of the solid solutions are nonmonotonic functions of Fe content, with a minimum at x = 0.4. Dilatometric data are used to determine the thermal expansion coefficients of the solid solutions. At low oxygen partial pressures ( ≤ 40 Pa), the high-temperature, disordered perovskite phase exists between 850 and 1000 ° C, which is the optimal temperature range for the effective use of SrCo 1x F e x O 3 -δ ceramics as oxygen membranes in oxygen partial pressure gradients of 10 4

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