The oxidation state of Mn in cubic and orthorhombic was investigated by electron energy loss (EEL) spectroscopy. Change in the oxidation state of Mn produced some spectral changes in the O-K edge as well as in the edge EEL spectra. This study demonstrated that the oxidation state of Mn and the amount of oxygen vacancies in cubic and orthorhombic could be quantified by analyzing the features of the O-K edge spectrum and the Mn ratio in the edge spectrum. Our quantitative analysis showed that the spectral changes in the edge were mainly caused by the oxidation state of Mn, whereas those in the O-K edge could be sensitive to both the oxidation state of Mn and to lattice distortions.
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