A CHEMICAL STATE OF THE SURFACE OF MECHANOACTIVATED MANGANESE (MnmOn) OXIDES
A surface of manganese oxides: Mn3O4, Mn2O3, and MnO2, mechanoactivated by a high intensity grinding technology has been studied by X-ray photoelectron spectroscopy. Mn2O3 has been found to be the most thermodynamically stable of all the oxides under investigation. The surface layer of the Mn3O4 and MnO2 oxides due to the mechanoactivation has transformed into a stable Mn2O3 form. Furthermore, the process of mechanoactivation has substantially enhanced a chemical stability of Mn2O3 against environmental impacts. The obtained results have been explained in terms of specific features of the activated surface structural condition.