The compounds ScMnO3 and CaMnO3 were obtained by high- temperature
solid state reactions considering a stoichiometric rate of CaCO3: Mn2O3 and
Sc2O3:Mn2O3. The findings were characterized by X-ray powder diffraction.
The determination method of av
erage oxidation state of these compounds based
on dissolving the samples in concentrated HCl solution. Cl2 obtained by
dissolving the samples is reduced by KI solution. I2 was titrated with standard
sodium thiosulfate solution. In the calculation it was taken a as a fraction of
Mn3+ in the mixed oxides. The formula of Scandium manganite was formulated
as ScMnO3+0.12, and for calcium manganite as CaMnO3-0.03. The relative
standard deviation in the identification of Mn does not exceed 3,5%.
