Selective behaviour of dilute Fe3+ ions in silicate glasses: an Fe K-edge EXAFS and XANES study

BINGHAM, Paul, HANNANT, O.M., REEVES-MCLAREN, N., STENNETT, M.C. and HAND, R.J. (2014). Selective behaviour of dilute Fe3+ ions in silicate glasses: an Fe K-edge EXAFS and XANES study. Journal of Non-Crystalline Solids, 387, 47-56.

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Iron K-edge EXAFS and XANES have been used to study the local structural environment of dilute quantities (0.2 mol% Fe2O3) of Fe3 + in seven representative SiO2–R2O–R’O glasses where R = (Li, Na, K), R’ = (Mg, Ca, Sr, Ba). Sample preparation was carried out by adding excess CeO2 as an oxidising agent and it was confirmed by optical absorption spectroscopy that iron was fully oxidised to Fe3 +. This methodology has made possible, for the first time, an unambiguous EXAFS study of the coordination and local structural environment of dilute levels of Fe3 + in alkali–alkaline earth–silica glasses without the complications presented by the presence of Fe in multiple oxidation states. Coordination of Fe3 + in these glasses is strongly affected by the nature of the alkali and alkaline earth cations, with Fe3 +–O CN increasing from 4.0 ± 0.4 to 6.2 ± 0.9 with decreasing alkali/alkaline earth ionic radius ratio (IRR). Respective Fe

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: 47-56
Depositing User: Hilary Ridgway
Date Deposited: 18 Sep 2014 10:39
Last Modified: 18 Mar 2021 10:45

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