Concentrations And Site Partitioning Of Fe2+ And Fe3+ Ions In A Soda-Lime-Silica Glass Obtained By Optical Absorbance Spectroscopy

Iron-doped glasses with nominal mol% consumption 15Na2O-15CaO-70SiO2, melted under oxidising and reducing conditions, and in most cases refined with sodium sulphate, have been analysed by optical absorbence spectroscopy over a wide range (3000-35000cm-1). The Fe2O concentration was varied from 0.05 to 2 mol% and some of the glasses were co-doped with CeO2, reduced with carbon, or oxidised with NaNO3. The developed mathematical fitting analysis revealed that Fe2+ and Fe3+ ions both occupy octahedral and tetrahedral sites. Both types of Fe2+ sites were found to be Jahn-Teller distorted, i.e. elongated, by fitting the transmission absorbence spectra.