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Formulation, Testing, and Structural Characterization of High-Zirconium High-Level Waste Glasses

Published online by Cambridge University Press:  10 February 2011

David A. McKeown ,
Isabelle S. Muller ,
Andrew C. Buechele ,
Ian L. Pegg ,
Christopher A. Kendziora  and
Charles R. Scales
David A. McKeown
Affiliation:
Vitreous State Laboratory, Catholic University of America, Washington, D.C.
Isabelle S. Muller
Affiliation:
Vitreous State Laboratory, Catholic University of America, Washington, D.C.
Andrew C. Buechele
Affiliation:
Vitreous State Laboratory, Catholic University of America, Washington, D.C.
Ian L. Pegg
Affiliation:
Vitreous State Laboratory, Catholic University of America, Washington, D.C.
Christopher A. Kendziora
Affiliation:
Condensed Matter Division, Code 6653, Naval Research Laboratory, Washington, D.C.
Charles R. Scales
Affiliation:
BNFL plc, Sellafield, United Kingdom
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Abstract

A range of compositions of high-zirconia borosilicate glasses were formulated and their structures investigated by a combination of techniques. These compositions have potential applications for high-level nuclear waste storage in combination with advanced reprocessing methods. Raman and Zr EXAFS data were collected for a series of glasses spanning a range of zirconia concentrations. The Raman spectra indicate that Zr acts as a silicate network modifier, where the silicate tetrahedral network depolymerizes as the zirconia content increases. Zr EXAFS analysis indicates that Zr is found in octahedral sites, and to a minor extent, sevencoordinated sites. As the zirconia content increases, the fraction of seven-coordinated Zr-sites increases; this may be the cause of ZrO2 baddeleyite crystallization that was observed in some Zr-rich glasses investigated.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 305
Copyright
Copyright © Materials Research Society 1999

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References

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