Skip to main content
×
Home
    • Aa
    • Aa

Precipitation of Mixed-Alkali Molybdates During HLW Vitrification

  • Scott Kroeker (a1), Carolyn Higman (a2), Vladimir K Michaelis (a3), Nicholas B Svenda (a4) and Sophie Schuller (a5)...
Abstract
Abstract

Crystalline precipitates from molybdenum-containing nuclear waste glasses are complex, often containing multiple cations which confound routine structural techniques. A simplified mixed-alkali borosilicate model glass was found to have minor crystalline phases which could not be identified by x-ray diffraction. Multinuclear magnetic resonance (NMR) spectroscopy revealed sharp peaks characteristic of crystallinity superimposed on the broader glass signals, but were unattributable to any known molybdate phases. When a comprehensive range of cesium molybdates failed to reveal any matches with the observed 133Cs magic-angle spinning (MAS) NMR peaks in the composite glass/crystalline material, a series of mixed-alkali sodium-cesium molybdate phases was synthesized. 23Na, 133Cs and 95Mo MAS NMR revealed the formation of two mixed-cation molybdates which correlate with the observed NMR peaks for the phase-separated model glass. This work highlights the prominence of multiple crystalline phases in Mo-bearing nuclear waste glasses, and demonstrates the unique utility of solid-state NMR as a fingerprinting approach to identifying complex phases, especially where x-ray diffraction is limited by multiple phases, low concentrations or substitutionally disordered precipitates.

Copyright
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

2 S. Schuller O. Pinet A. Grandjean and T. Blisson J. Non –Cryst. Solids 354, 296300 (2008).

8 J. Skibsted and H.J. Jakobsen Solid State Nuclear Magnetic Resonance Resonance, 3, 2938 (1994).

10 J.B.E. Lacaillerie F. Barberon , K.V. Romanenko O.B. Lapina L. Polles R. Gautier and Z. Gan , J. Phys. Chem. B 109, 1403314042 (2005).

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords:

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 3 *
Loading metrics...

Abstract views

Total abstract views: 79 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 23rd August 2017. This data will be updated every 24 hours.