Abstract
Fourier transform infrared (FTIR) absorption spectra have been measured for a series of potassium aluminosilicate glasses. The influence of preparation temperature, atmosphere, composition and crystallization of the studied glasses on their structure is discussed. Systematic changes are observed in the frequency and intensity characteristics of the spectral bands with variations in iron content for these glasses. The 57Fe Mössbauer spectroscopy was used to find the correlation between the coordination number and the valence state of Fe 2+ and Fe 3+ cations. The phase composition of samples undergoing crystallization was confirmed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). On the basis of FTIR spectra and other considerations, a structural model is proposed to describe potassium aluminosilicate glasses containing iron oxides. It is found that the analyzed glasses have three-dimensional network structures, with silicon and aluminium in tetrahedral coordination. However, iron exhibits a variety of bonding geometries. Glass structures, intermediate between very highly ordered network forming units and crystallites regions, are also discussed.
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