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Phase Separation in Simulated Plutonium Glasses with Phosphateand 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 fluorineincreased. Amorphous phase separation was found in the glass as a result ofinteraction between phosphate and fluorine, in which Ce and Gd stronglypartitioned. The glasses exhibiting amorphous phase separation showed highernormalized B releases according to the 31-day product consistency test (PCT)compared to glasses without phase separation. Phosphate that leached fromglass into water increased the concentrations of Ce and Gd in the 7- and31-day PCT solutions by more than an order of magnitude. The liquid state 31P-NMR results suggested that phosphate in water interactswith Ce or Gd. Therefore, the observed concentration jump for Ce and Gd inthe PCT solution may be attributed to the increases in the solubility limitsof Ce and Gd as a result of phosphate complexation with Ce and Gd.

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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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