Holland, Diane, Parkinson, Ben G., Islam, Moinul M., Duddridge, Adam, Roderick, Jonathan M., Howes, Andy P. and Scales, Charlie R. (2008) NMR investigation of cation distribution in HLW wasteform glass. In: 31st Symposium on Scientific Basis for Nuclear Waste Management, Univ Sheffield, Immobilisat Sci Lab, Sheffield, England, Sep 16-21, 2007. Published in: Proceedings of the Materials Research Society Symposium , Vol.1107 pp. 199-206.

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Abstract

Magic-angle-spinning NMR has been used to establish the structural roles of various cations added to the borosilicate glass which is used for the vitrification of high-level nuclear waste (HLW). Representative surrogate oxides with nominal valencies of +1, +2 and +3 have been studied which span the range of oxides from modifier to intermediate and conditional glass-former. NMR has been carried out on those nuclei which are accessible and the species observed have been correlated with the physical and chemical behaviour. The controlling factor is the manner in which the alkali cations partition between the various network groups, changing the distribution of silicon Q(n) species and the boron N-4 ratio. Identifiable superstructural units are also present in these glasses. The aqueous corrosion rate increases with Q(3) content, as does the weight loss due to evaporation from the melt. The activation energy for DC conduction scales with N-4. Values of N-4 obtained for these glasses deviate significantly from those predicted by the currently accepted model (Dell and Bray) and are strongly affected by the modifier or intermediate nature of the surrogate oxide and also by its effect on the distribution of non-bridging oxygens between the silicate and borate polyhedra.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > Physics
Series Name:	MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS
Journal or Publication Title:	Proceedings of the Materials Research Society Symposium
Publisher:	Materials Research Society
ISBN:	978-1-60511-079-0
ISSN:	0272-9172
Editor:	Lee, WE and Roberts, JW and Hyatt, NC and Grimes, RW
Date:	2008
Volume:	Vol.1107
Number of Pages:	8
Page Range:	pp. 199-206
Status:	Not Peer Reviewed
Publication Status:	Published
Title of Event:	31st Symposium on Scientific Basis for Nuclear Waste Management
Type of Event:	Conference
Location of Event:	Univ Sheffield, Immobilisat Sci Lab, Sheffield, England
Date(s) of Event:	Sep 16-21, 2007
URI:	http://wrap.warwick.ac.uk/id/eprint/29681

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