Abstract
Isotopic substitution in neutron diffraction combined with empirical potential structure refinement simulations has been employed to probe the sites occupied by Fe3+ and Fe2+ in a NaFeSi2O6 glass. This study reveals the presence of two populations of Fe3+ sites. 95% of Fe3+ is in tetrahedral sites (dFe3+–O=1.866±0.001Å), as the remainder ferric iron and ferrous iron (∼20% of total Fe) are five coordinated.
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