Three dense membranes of types SrCo 0.8 Fe 0.2 O 3-d (SCF(82)), La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3-d (LSCF(6482)) and La 0.8 Sr 0.2 Co 0.6 Fe 0.4 O 3-d (LSCF (8264)) perovskites were prepared by complexation applying a chelating agent, ethylene diamine N,N,N 0 ,N 0 -tetra-N-acetyl-diamine (EDTNAD). The oxygen permeation flux through the perovskite membranes was measured as a function of temperature within 1,073-1,223 K as well as the oxygen partial pressure of 0.1-1.0 bar. The oxygen permeation fluxes for the membranes, SCF(82), LSCF(6482), LSCF(8264) with the thickness of 0.85 mm were observed as 9.2 9 10 -7 (mol/cm 2 s), 1.7 9 10 -7 (mol/cm 2 s), and 1.0 9 10 -7 (mol/cm 2 s) in these cases at 1,153 K. The results indicated the oxygen permeation process was mainly controlled by the oxygen bulk diffusion through these membranes.