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Abstract
The role of iron in silicate glasses is not yet completely clear. The system appears complicated because the iron ions may occupy both coordination sites O h and T d. By means of optical and EPR spectroscopy and by considering results from other techniques, we find that in our Na 2O·2SiO 2 glasses, these ions behave both as network modifiers and formers, even if Fe 3+ is in the majority in T d sites and Fe 2+ is in the majority in O h sites. When the concentration of Fe 3+ rises we have the formation of Fe 3+ clusters at the expense of Fe 3+ isolated ions. Also the presence of interactions between Fe 2+ and the groupings formed by Fe 3+ is demonstrated. In very reduced samples some iron is present as metal.
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