Structural studies of iron in vitrified toxic wastes

HANNANT, O. M., FORDER, Sue, BINGHAM, Paul and HAND, R. J. (2009). Structural studies of iron in vitrified toxic wastes. Hyperfine Interactions, 192 (1-3), 37-42.

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Link to published version:: 10.1007/s10751-009-9944-5

Abstract

Mössbauer spectroscopy and X-ray absorption spectroscopy (XAS) have been used to obtain information on the redox and coordination of iron in glasses made by the vitrification of simulated and actual sewage sludge combustion ashes. Mössbauer spectra have been deconvoluted using three extended Voigt-based profiles to allow quantitative analysis of multiple Fe3+ coordination environments. XAS Fe pre-K-edge absorption peaks have been analysed and fitted against reference standards to yield complementary analyses and provide validation of the Mössbauer results. Correlations are noted between the iron redox and the Fe3+ coordination. Tetrahedral Fe3+ is much more likely to take part in any redox reaction whilst octahedral Fe3+ appears to bemore resistant to reduction to the ferrous state. Results from XAS also suggest that Fe2+ ions occupy both four- and six-fold coordination environments. Neither technique has provided any clear evidence for the existence of Fe2+ or Fe3+ in five-fold symmetry in the glasses studied.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number: 10.1007/s10751-009-9944-5
Depositing User: Helen Garner
Date Deposited: 17 Apr 2012 16:13
Last Modified: 17 Apr 2012 16:13
URI: http://shura.shu.ac.uk/id/eprint/4979

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