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Powder XRD patterns of the manganese oxide particles obtained after calcination of the Mn(II) glycolate for 2 h at different temperatures in an Ar (black) and an O2 (red) flow of 50 NL/h. Reference patterns are depicted at the top for Mn3O4 (*), Mn5O8 (+) and α-Mn2O3 (○), where the symbols indicate the respective low-angle reflections.
