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Analytical Electron Microscopy Examination of Solid Reaction Products in Long-Term Tests of Srl 200 Waste Glasses

Published online by Cambridge University Press:  25 February 2011

E. C. Buck ,
J. A. Fortner ,
J. K. Bates ,
X. Feng ,
N. L Dietz ,
C. R. Bradley  and
B. S. Tani
E. C. Buck
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
J. A. Fortner
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
J. K. Bates
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
X. Feng
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
N. L Dietz
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
C. R. Bradley
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
B. S. Tani
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
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Abstract

Alteration phases, found on the leached surfaces and present as colloids in the leachates of 200-based frit (fully active and simulated) nuclear waste glass, reacted under static test conditions, at a surface area to leachate volume ratio of 20,000 m-1 for 15 days to 728 days, have been examined by analytical electron microscopy. The compositions of the secondary phases were determined using X-ray energy dispersive spectroscopy and electron energy loss spectroscopy, and structural analysis was accomplished by electron diffraction. Long-term samples of simulated glass, which had undergone an acceleration of reaction after 182 days, possessed a number of silicate secondary phases, including; smectite (iron silicate and potassium iron alumino-silicate), weeksite (uranium silicate), zeolite (calcium potassium alumino-silicate), tobermorite (calcium silicate), and a pure silica phase. However, uranium silicates and smectite have also been observed in tests which have not undergone the acceleration of reaction, in both the leachate and leached layer, suggesting that these phases are not responsible for the acceleration of reaction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 333: Symposium V – Scientific Basis for Nuclear Waste Management XVII , 1993 , 585
Copyright
Copyright © Materials Research Society 1994

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References

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