Abstract
The valence state and coordination environment of the Fe ions in a number of Fe-containing zinc borate glasses with the general formula xFe2O3–(100–x)[40ZnO · 60B2O3] (x = 2.5–10 mol %) have been studied by Mossbauer spectroscopy. The results indicate that all of the glasses contain both Fe2+ and Fe3+ ions. The percentage of trivalent ions considerably exceeds that of Fe2+ ions and the relationship between the Fe2+ and Fe3+ concentrations is essentially independent of the Fe2O3 content in the zinc borate matrix. Most of the Fe3+ ions are in tetrahedral coordination, but raising the Fe2O3 content to above 5 mol % leads to a gradual increase in the percentage of Fe ions in octahedral coordination.
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