PHYSICOCHEMICAL AND STRUCTURAL CHARACTERIZATION OF SILICATE GLASSES CONTAINING IRON OXIDES
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2023-01-01
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Abstract
The interest in glasses containing iron oxides is determined by the possibility for application in optics, sensors, nanoelectronics, biotechnology and medicine. Subject of the present investigation is the preparation of glasses in the system 16Na2O/10CaO/(74-x)SiO2/xFe2O3, x = 0, 5, 10 and 15 mol % by applying the traditional melt-quenching technique. X-ray diffraction analysis proves that the materials with up to 15 mol % Fe2O3 are amorphous while for higher concentrations, the crystallization of magnetite and hematite occurs during melt quenching. For the physicochemical characterization of the glasses, the density, molar volume and oxygen packing density have been determined. The Becke line method has been utilized for the refractive indices measurement. The structural evolution in dependence of the Fe2O3 concentration has been studied by Fourier Transformed Infrared Spectroscopy. The data obtained from the different methods correlates well and reveals a depolymerization tendency of the silicate network with the increasing Fe2O3 concentration, i.e. an increase in the number of SiO4 tetrahedra with more non-bridging oxygens as a result of the occurrence of Fe-containing polyhedra in the glass structure.