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a) TGA measurements recorded while heating the Mn(II) glycolate precursor up to 700 °C at 2 K/min in an Ar (black) and an O2/Ar (1:2) (red) flow of 40 NmL/min; b) detailed view of the temperature range between 250 and 500 °C of the TGA (red) and DSC (blue) measurements in O2/Ar (1:2) flow indicating the oxidation of Mn3O4 to Mn5O8 and α-Mn2O3.
