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ABO2-type perovskite materials have been wide applied in solid oxide fuel cells and gas sensors. SrFeO2 with P4/mmm structure exhibiting an unparalleled FeO4 square-planar coordination structure. We have investigated the Sr-site substitution effect on the electronic conductivity of the perovskite-type structure of (Sr1−xCax)FeO2 and (Sr1−xBax)FeO2 (x=0, 0.25, 0.5, 0.75) by using first-principle calculations...