The effect of the reducing melting atmosphere on coordination moieties in aluminosilicate glasses

The subject of the study were model glasses from the SiO2–Al2O3–Fe2O3–CaO–MgO system, in which iron in the amount of 9% wt. was introduced at the expense of selected oxide groups: SiO2, Al2O3, CaO–MgO and vitrified glass was obtained by vitrifying slag from solid waste. The raw material sets were melted under reducing conditions. In order to determine the type of iron coordination group present in rendered aluminosilicate glasses, structural studies were performed using infrared spectroscopy (MIR mid-infrared) and Mössbauer spectroscopy. Based on the analysis of absorption spectra, the characteristics of the short range ordering of the obtained glasses were determined, the state of the coordination moieties of iron ions Fe2+ and Fe3+ was determined.