Mechanical Activation of Mixtures SiO2/γ-Fe2O3 and its Impact on the Distribution of Valence Electrons

Abstract

Crystalline and electronic structures of SiO2/γ-Fe2O3 mixtures have been analyzed using X-ray diffraction (XRD) and ultra-soft X-ray emission spectroscopy (USXES). The energy redistribution of Fesрd, Sisp and Op valence electrons due to changes in the mass ratio (0,2 SiO2 + 0,8 γ-Fe2O3 , 0,5 SiO2 + 0,5 γ-Fe2O3, 0,8 SiO2 + 0,2 γ-Fe2O3) of SiO2 and α-Fe2O3 in the mixtures has been studied. The FeLα, SiLα and OKα ultra-soft X-ray emission spectra of SiO2/α-Fe2O3 mixtures were compared with those of individual iron oxide and silica powders. In analyzing these bands were detected shape similarity and the presence of identical elements of fine structure in OKα and FeLα-emission spectra, it shows a high degree of hybridization and Op- Fe3d - electronic valence states. Expansion OKα and FeLα-emission bands in the low energy side is the result of additional splitting energy Op- and Fe3d - levels with increasing degree of hybridization in the mehanoaktyvatsiynoyi processing.