The electronic conductivity of this material is significant, ranging from 350 to 250 Scm -1 in 600 -800 temperature range°C . This significant electronic conductivity of the material originates from the mixed valencies Fe 3+ /Fe 4+ and Co 3+ /Co 4+ , which is essentially the result of La substitution by Sr. Equally important benefit of this substitution is the formation of oxygen vacancies in the LSCF system, which ultimately contributes to the ionic conductivity of this MIEC cathode material, with 10 -2 Scm -1 ionic conductivity at 800 °C being reported by Teraoka et al. . Further the material also has TEC in the range of 15 x 10 -6 K -1 , which is in the compatible range of other cell components .