The　cobalt-free　layered　perovskite　oxides　Sm1-xLaxBaFe2O5+delta　(x　=　0-0.5)　(SLBFx,　for　short)　have　been　systematically　investigated　to　evaluate　the　feasibility　of　using　them　as　cathodes　for　intermediatetemperature　solid　oxide　fuel　cells　(IT-SOFCs).　SLBFx　powders　with　an　orthorhombic　structure　were　synthesized　by　the　EDTA-glycine　combustion　method　and　were　observed　to　be　compatible　with　LSGM　and　SDC　electrolytes　below　1250　degrees　C.　The　electrical　conductivities　of　the　SLBFx　samples　significantly　increased　with　the　substitution　of　La　for　Sm,　with　the　highest　conductivity　of　37.8　S　cm(-1)　obtained　for　the　SLBF0.5　sample　at　600　degrees　C.　Of　the　La-doped　SmBaFe2O5+delta　series　samples,　SLBF0.2　displayed　the　lowest　thermal　expansion　coefficient　(TEC)　and　the　minimum　electrode　polarization　resistance,　with　values　of　16.51　x　10(-6)　K-1　in　the　50-800　degrees　C　range　and　0.24　Omega　cm(2)　at　750　degrees　C,　respectively.　The　anodesupported　single　cell　with　SLBF0.2　as　the　cathode　was　able　to　generate　a　maximum　power　density　of　558　mW　cm(-2)　at　800　degrees　C　in　humidified　H-2.　All　things　considered,　SLBFx　materials　are　good　candidates　for　cobalt-free　cathodes　in　IT-SOFCs.