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Comparison of the Layer Structure of Vapor Phase and Leached SRL Glass by Use of AEN

Published online by Cambridge University Press:  21 February 2011

Bruce M. Biwer ,
John K. Bates ,
Teofilo A. Abrajano  and
John P. Bradley
Bruce M. Biwer
Affiliation:
Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60559
John K. Bates
Affiliation:
Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60559
Teofilo A. Abrajano
Affiliation:
Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60559
John P. Bradley
Affiliation:
McCrone Environmental Services, Inc., 850 Pasquinelli Drive, Westmont, IL 60559
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Abstract

Test samples of 131 type glass that have been reacted for extended time periods in water vapor atmospheres of different relative humidities and in static leaching solution have been examined to characterize the reaction products. Analytical electron microscopy (AEM) was used to characterize the leached samples, and a complicated layer structure was revealed, consisting of phases that precipitate from solution and also form within the residual glass layer. The precipitated phases include birnessite, saponite, and an iron species, while the intralayer phases include the U-TI containing phase brannerite distributed within a matrix consisting of bands of an Fe rich montmorillonite clay. Comparison is made between samples leached at 40°C for 4 years with those leached at 90°C for 3-1/2 years. The samples reacted in water vapor were examined with scanning electron microscopy and show increasing reaction as both the relative humidity and time of reaction increases. These samples also contain a layered structure with reaction products on the glass surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 176: Symposium U – Scientific Basis for Nuclear Waste Management XIII , 1989 , 255
Copyright
Copyright © Materials Research Society 1990

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References

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