Abstract
Mossbauer spectroscopy has been used to study several glasses and glass ceramics based on the system K2O-Na2O-CaO-MgO-Al2O3-SiO2 with additions of Fe2O3, Fe3O4 and P2O5. The change of co-ordination and proportion of Fe2+ and Fe3+ occurring during the transformation from glass to glass ceramic was studied. By means of the nuclear magnetic hyperfine splitting effect Fe3O4 was found in glass ceramics with more than 2% of P2O5. The amount of Fe3O4 formed was found to increase with P2O5 addition, but Fe3O4 was not identified in the glass with no P2O5 addition.
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