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Nanometer perovskite LaMnO3+λ, La0.6Ce0.4MnO3+λ and La0.6Sr0.4MnO3+λ were prepared by citric acid-aided sol-gel method. The effects of Ce, Sr on the structure and properties of nanometer perovskite were studied through DT-TGA, XRD, TEM and BET analyses. T