Comparative Structural Study and Dissolution of Simplified Glasses: A Radioactive Waste Glass (R7T7) and a Basaltic Glass

1997 ◽  
Vol 506 ◽  
Author(s):  
F. Angeli ◽  
P. Faucon ◽  
T. Charpentier ◽  
J.C. Petit ◽  
J. Virlet
Keyword(s):  
Nuclear Waste ◽  
Magic Angle Spinning ◽  
Waste Glass ◽  
Magic Angle ◽  
Basaltic Glass ◽  
Qualitative Information ◽  
Local Environments ◽  
Nuclear Waste Glass ◽  
Angle Spinning ◽  
Main Components

ABSTRACTThe local cation environments in a borosilicate glass (containing the main components of the French nuclear waste glass, R7T7) and of basaltic-like glass are presented on the basis of17A1 and23Na Multi-Quanta Magic-Angle Spinning Nuclear Magnetic Resonance (MQ-MAS NMR) spectroscopies. The chemical and geometrical environment of each nucleus is characterized. Moreover, qualitative information about the distribution of these parameters, characteristic of the disorder level in the structure, is obtained. These results are presented with the characteristics of the Al and Na dissolution in water at 100°C. The relation between the local environments of these cations and their mass loss in solution is discussed.

Hydrotalcite Formed by Alteration of R7T7 Nuclear Waste Glass and Basaltic Glass in Salt Brine at 190°C

1993 ◽  
Vol 333 ◽  
Author(s):  
A. Abdelouas ◽  
J. L. Crovisier ◽  
W. Lutze ◽  
R. Müller ◽  
W. Bernotat
Keyword(s):  
Nuclear Waste ◽  
Waste Glass ◽  
Aluminium Content ◽  
Basaltic Glass ◽  
Alteration Product ◽  
Nuclear Waste Glass ◽  
Salt Brine ◽  
High Aluminium ◽  
Early Alteration

ABSTRACTThe R7T7 and synthetic basaltic glasses were submitted to corrosion in a saline MgCl2dominated solution at 190°C. For both glasses, the early alteration product is a hydrotalcite-like compound in which HPO42-, SO4-2and Cl-substitutes to CO32. The measured d003spacing is 7.68 Å for the hydrotalcite formed from R7T7 glass and 7.62 Å for the hydrotalcite formed from basaltic glass which reflect the high aluminium content. Chemical microanalyses show that the hydrotalcite is subsequently covered by a silica-rich gel which evolves into saponite after few months.

NMR Investigation of Cation Distribution in HLW Wasteform Glass

2008 ◽  
Vol 1107 ◽  
Author(s):  
Diane Holland ◽  
Ben G Parkinson ◽  
Moinul M Islam ◽  
Adam Duddridge ◽  
Jonathan M Roderick ◽  
...  
Keyword(s):  
Nuclear Waste ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Aqueous Corrosion ◽  
Alkali Cations ◽  
Chemical Behaviour ◽  
High Level Nuclear Waste ◽  
Angle Spinning ◽  
High Level ◽  
Physical And Chemical

AbstractMagic-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 glassformer. 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 Qn species and the boron N4 ratio. Identifiable superstructural units are also present in these glasses. The aqueous corrosion rate increases with Q3 content, as does the weight loss due to evaporation from the melt. The activation energy for DC conduction scales with N4. Values of N4 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 nonbridging oxygens between the silicate and borate polyhedra.

Probing Local Environments in Paramagnetic Europium-Substituted Keggin Solids by31P Magic Angle Spinning NMR Spectroscopy

2006 ◽  
Vol 110 (25) ◽  
pp. 12340-12350 ◽  
Author(s):  
Wenlin Huang ◽  
Mark Schopfer ◽  
Cheng Zhang ◽  
Robertha C. Howell ◽  
Becky A. Gee ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Local Environments ◽  
Angle Spinning

Infrared Spectroscopy Structural Analysis of Corroded Nuclear Waste Glass K-26

2008 ◽  
Author(s):  
Sergey Stefanovsky ◽  
Alexander Barinov ◽  
Galina Varlakova ◽  
Irene Startseva ◽  
Michael I. Ojovan
Keyword(s):  
Infrared Spectroscopy ◽  
Structural Analysis ◽  
Nuclear Waste ◽  
Waste Glass ◽  
Nuclear Waste Glass
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