95Mo NMR Study of Crystallization in Model Nuclear Waste Glasses

Kroeker, S. and Farnan, I. and Schuller, S. and Advocat, T. (2009) 95Mo NMR Study of Crystallization in Model Nuclear Waste Glasses. In: Materials Research Society Symposium Proceedings.

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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.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	09AREP; IA58;
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Volume:	1124
Page Range:	pp. 153-160
Identification Number:	10.1557/PROC-1124-Q03-06
Depositing User:	Sarah Humbert
Date Deposited:	10 Sep 2009 08:10
Last Modified:	23 Jul 2013 09:55
URI:	http://eprints.esc.cam.ac.uk/id/eprint/1170

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