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Phase Separation in Simulated Plutonium Glasses with Phosphate and Fluorine and the effect on Glass Corrosion in Water

Published online by Cambridge University Press:  03 September 2012

H. Li ,
J. D. Vienna ,
Y. L. Chen ,
L. Q. Wang  and
J. Liu
H. Li
Affiliation:
Pacific Northwest National Laboratory, Box 999, P8–37, Richland, WA 99352
J. D. Vienna
Affiliation:
Pacific Northwest National Laboratory, Box 999, P8–37, Richland, WA 99352
Y. L. Chen
Affiliation:
Pacific Northwest National Laboratory, Box 999, P8–37, Richland, WA 99352
L. Q. Wang
Affiliation:
Pacific Northwest National Laboratory, Box 999, P8–37, Richland, WA 99352
J. Liu
Affiliation:
Pacific Northwest National Laboratory, Box 999, P8–37, Richland, WA 99352
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Abstract

The solubility limit of phosphate in glass was found to decrease as fluorine increased. Amorphous phase separation was found in the glass as a result of interaction between phosphate and fluorine, in which Ce and Gd strongly partitioned. The glasses exhibiting amorphous phase separation showed higher normalized B releases according to the 31-day product consistency test (PCT) compared to glasses without phase separation. Phosphate that leached from glass into water increased the concentrations of Ce and Gd in the 7- and 31-day PCT solutions by more than an order of magnitude. The liquid state 31P-NMR results suggested that phosphate in water interacts with Ce or Gd. Therefore, the observed concentration jump for Ce and Gd in the PCT solution may be attributed to the increases in the solubility limits of Ce and Gd as a result of phosphate complexation with Ce and Gd.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 277
Copyright
Copyright © Materials Research Society 1997

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References

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