Abstract
In order to determine the oxygen coordination numbers of Fe ions in the melts, Mössbauer spectra of Fe ions in silicate and posphate glasses have been measured and the distributions of Fe3+ (tetr.) and Fe3+ (oct.) in CaO-SiO2 or Na2O-SiO2 systems have been calculated. The results indicate that the ratio of Fe3+ (oct.)/Fe3+ (tetr.) is varied with the basicity of glasses and Fe2O3 contents. In the glasses containing 10 mol%Fe2O3, Fe3+ (tetr.) is predominant for basic samples, and Fe3+ (oct.), on the other hand, for acidic glasses. The ratio of Fe3+ (oct.)/Fe3+ (tetr.) increases with increasing Fe2O3 content.The constitution of Fe3+-oxygen complex anions is also discussed in terms of the ratio of Fe3+ (oct.)/Fe3+ (tetr.).
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