NMR insights into wasteforms for the vitrification of high-level nuclear waste
Holland, D., Parkinson, B. G., Islam, M. M., Duddridge, A., Roderick, J. M., Howes, A. P. and Scales, C. R.. (2007) NMR insights into wasteforms for the vitrification of high-level nuclear waste. Applied Magnetic Resonance, Vol.32 (No.4). pp. 483-497. ISSN 0937-9347Full text not available from this repository.
Official URL: http://dx.doi.org/10.1007/s00723-007-0038-8
Magic-angle spinning nuclear magnetic resonance of B-11, Si-29 and Al-27 has been used to study the distribution of nonbridging oxygen atoms (NBO) in an alkali borosilicate glass to which surrogate oxides for high-level radioactive waste have been added. The properties of such glasses are shown to depend on the fraction N (4) of four-coordinated boron atoms (B4) and on the fraction of silicate tetrahedra possessing one NBO, Q(3). The aqueous corrosion rate increases with Q(3) content, as does weight loss due to evaporation from the melt. The activation energy for direct current conduction scales with N-4. Values of N-4 obtained for these glasses deviate from those predicted by the currently accepted model and are strongly affected by the modifier or intermediate nature of the surrogate oxide and also by its effect on the distribution of NBO between the silicate and borate polyhedra.
|Item Type:||Journal Article|
|Subjects:||Q Science > QC Physics|
|Divisions:||Faculty of Science > Physics|
|Journal or Publication Title:||Applied Magnetic Resonance|
|Official Date:||December 2007|
|Number of Pages:||15|
|Page Range:||pp. 483-497|
|Access rights to Published version:||Restricted or Subscription Access|
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