Mössbauer studies of phosphate glasses for the immobilisation of toxic and nuclear wastes

BINGHAM, Paul, FORDER, S. D., HAND, R. J. and LAVAYSIERRE, A. (2005). Mössbauer studies of phosphate glasses for the immobilisation of toxic and nuclear wastes. Hyperfine Interactions, 165 (1-4), 135-140.

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Abstract

Various iron-containing phosphate glasses were investigated by Mössbauer spectroscopy. Iron was found to occur predominantly as Fe3+ in all glasses, and largely occupied sites with distorted octahedral coordination for both redox states. Using a base glass of nominal composition 60 P2O5–40 Fe2O3 (mol%), stepwise molar replacement of Fe2O3 by (0.67 Na2O × 0.33 Al2O3) increased the redox ratio, Fe2+/ΣFe, from 0.13 at 40% Fe2O3 to 0.25 at 10% Fe2O3. The centre shift increased and quadrupole splitting decreased by up to ∼20% over this range, interpreted as a decrease in the average distortion of Fe sites from cubic symmetry, and an increase in average iron coordination. Literature revealed that recoil-free fraction ratio f (Fe3+) / f (Fe2+) ≈ 1.3 in iron phosphate glasses, and this was considered when assessing redox. Mössbauer parameters of these and other glasses demonstrated a combination of structural stability and compositional flexibility which makes them so suitable for waste immobilisation.

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/s10751-006-9256-y
Depositing User:	Hilary Ridgway
Date Deposited:	06 Sep 2012 14:48
Last Modified:	06 Sep 2012 14:48
URI:	http://shura.shu.ac.uk/id/eprint/5850

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