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95Mo NMR Study of Crystallization in Model Nuclear Waste Glasses

Published online by Cambridge University Press:  01 February 2011

Scott Kroeker ,
Ian Farnan ,
Sophie Schuller  and
Thierry Advocat
Scott Kroeker
Affiliation:
[email protected], University of Manitoba, Chemistry, Winnipeg, Canada
Ian Farnan
Affiliation:
[email protected], University of Cambridge, Earth Sciences, Cambridge, United Kingdom
Sophie Schuller
Affiliation:
[email protected], CEA-Marcoule, DEN/DTCD/SECM/LDMC, Bagnols/Céze, France
Thierry Advocat
Affiliation:
[email protected], CEA-Saclay, DEN/DANS/DPC/SECR, Gif-sur-Yvette, France
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Abstract

95Mo magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy is surprisingly sensitive to the local environment of tetrahedral molybdate species. A series of compounds related to expected crystallization products in nuclear waste glasses are probed to calibrate their spectral characteristics. Glasses formed with fast and slow quenching show a glassy peak corresponding to tetrahedral molybdate species. With slow quenching, a prominent sharp peak is observed, representing crystallinity. In sodium-borosilicate glasses with 2.5 mol% MoO3, the sharp peak corresponds to pure crystalline sodium molybdate. Cesium-sodium and lithium-sodium borosilicate glasses with Mo show crystalline peaks as well, and suggest that NMR may potentially be used to characterize mixed-cation molydates and more complex phase assemblages. While precise quantification of Mo in different phases is likely to be time-consuming, reasonable estimates can be obtained routinely, making 95Mo MAS NMR a useful tool for investigating phase separation and crystallization in model nuclear waste materials.

Keywords

nuclear magnetic resonance (NMR)amorphouswaste management
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1124: Symposium Q – Scientific Basis for Nuclear Waste Management XXXII , 2008 , 1124-Q03-06
Copyright
Copyright © Materials Research Society 2009

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References

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