Redox and clustering of iron in silicate glasses

BINGHAM, Paul, PARKER, J.M., SEARLE, T., WILLIAMS, J.M. and FYLES, K. (1999). Redox and clustering of iron in silicate glasses. Journal of Non-Crystalline Solids, 253 (1-3), 203-209.

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Soda–lime–silica glasses (70 mol% SiO2:15 mol% Na2O:15 mol% CaO) containing 0.1–5 mol% Fe2O3 have been investigated using optical absorption spectroscopy, Mössbauer spectroscopy, and wet chemical analysis. Iron redox ratios measured by these different techniques are in agreement. Samples were annealed at 550°C for 1 h in air. As the iron content increases more of the iron ions are in adjacent sites and this manifests itself as changes in the optical and Mössbauer spectra. For example an absorption peak in the visible region which appears with increasing iron content can be assigned to Fe2+–O2−–Fe3+ interactions. Mössbauer parameters indicate that, as Fe2+ and Fe3+ ions cluster, their co-ordination becomes more tetrahedral although the iron concentration has no effect on the Fe2+/ΣFe ratio in the glasses studied. Estimates of the proportion of Fe3+ ions in adjacent sites have been made using Mössbauer data.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number:
Page Range: 203-209
Depositing User: Hilary Ridgway
Date Deposited: 06 Sep 2012 14:18
Last Modified: 18 Mar 2021 09:30

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