The transport properties of La 0.1 Sr 0.9 Co 0.8 Fe 0.2 O 3−δ (LSCF1982) were measured by oxygen permeation measurements (850≤T/°C≤950, and1≤pO 2 /atm≤10 −4 ) and the chemical-diffusion coefficient was extracted from DC conductivity relaxation measurements. The maximum oxygen permeation flux was 1.17cm 3 /mincm 2 at air/He condition for the 1.5mm-thick LSCF1982 specimen and the maximum oxygen ion conductivity was around 1S/cm at 950°C in nitrogen condition, which strongly supports the potential for catalytic application. The maximum total conductivity was around 1×10 3 S/cm at 500°C in air, and the oxygen exponent m, applied in the equation σtot=PO2m, was assigned a value of 1/6 at the investigated temperature range. The chemical-diffusion coefficient (D̃) and surface exchange coefficient (κ) were also calculated from the DC conductivity relaxation measurement and the values were best fitted by the following two equations:D˜(cm2/s)=1.04×10°exp−0.58±0.01eVKT, k(cm/s)=1.09×101exp−0.77±0.06eVKT.