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NMR Characterization of Simulated Hanford Low-Activity Waste Glasses and its use in Understanding Waste form Chemical Durability

Published online by Cambridge University Press:  10 February 2011

J. G. Darab ,
J. C. Linehan  and
B. P. McGrail
J. G. Darab
Affiliation:
Pacific Northwest National Laboratory [1], Richland, WA 99352
J. C. Linehan
Affiliation:
Pacific Northwest National Laboratory [1], Richland, WA 99352
B. P. McGrail
Affiliation:
Pacific Northwest National Laboratory [1], Richland, WA 99352
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Abstract

Magic Angle Spinning Nuclear Magnetic Resonance (MAS-NMR) spectroscopy has been used to characterize the structural and chemical environments of B, Al, and Si in model Hanford low-activity waste glasses. The average 29Si NMR peak position was found to systematically change with changing glass composition and structure. From an understanding of the structural roles of Al and B obtained from MAS-NMR experiments, we first developed a model that reliably predicts the distribution of structural units and the average 29Si chemical shift value, δ, based purely on glass composition. A product consistency test (PCT) was used to determine the normalized elemental release (NL) from the prepared glasses. Comparison of the NMR and PCT data obtained from sodium boro-aluminosilicate glasses indicates that a rudimentary exponential relationship exists between the 29Si chemical shift value, and the boron NL value.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 337
Copyright
Copyright © Materials Research Society 1999

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References

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