Investigation of Glasses and Glaze Coats of Composition R2O–RO–Fe2O3(FeO)–Al2O3–B2O3–SiO2 by the EPR Method

The valence state and the coordination environment of the paramagnetic centers of iron ions in glasses and vitreous coats of composition R2O–RO–Fe2O3(FeO)–Al2O3–B2O3–SiO2 have been investigated by the EPR method. The tetrahedral and octahedral coordinations of Fe3+ ions have been revealed. The character of change in the EPR spectra of the materials studied in the vitreous and vitrocrystalline state has been determined. It is shown that the coordination number of iron ions is dependent on the crystallization processes.