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An Investigation into the Oxidation State of Molybdenum in Simplifies High Level Nuclear Waste Glass Compositions

Published online by Cambridge University Press:  01 February 2011

R. J. Short ,
R. J. Hand  and
N. C. Hyatt
R. J. Short
Affiliation:
ISL, Department of Engineering Materials, University of Sheffield, Sir Robert Hadfield, Building Mappin Street, Sheffield, S1 3JD, UK
R. J. Hand
Affiliation:
ISL, Department of Engineering Materials, University of Sheffield, Sir Robert Hadfield, Building Mappin Street, Sheffield, S1 3JD, UK
N. C. Hyatt
Affiliation:
ISL, Department of Engineering Materials, University of Sheffield, Sir Robert Hadfield, Building Mappin Street, Sheffield, S1 3JD, UK
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Extract

The redox state of Mo in glasses containing simplified simulated high level nuclear waste (HLW) streams has been investigated using Electron Spin Resonance (ESR) and X-ray Photoelectron Spectroscopy (XPS). Melts performed in highly oxidising or neutral (air) atmospheres contained Mo6+, but our study indicates that the Mo can be at least partially reduced to Mo4+ or Mo3+ by melting in a reducing atmosphere. The implications for glasses containing a full simulated HLW stream are that the formation of detrimental crystalline phases containing Mo6+ upon heat treatment may be avoided by reducing the oxidation state of Mo during melting.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 169
Copyright
Copyright © Materials Research Society 2004

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References

REFERENCES

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