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The Incorporation of Cerium in Zirconolite

Published online by Cambridge University Press:  03 September 2012

B. D. Begg  and
E. R. Vance
B. D. Begg
Affiliation:
Materials Division, ANSTO, PMB 1, Menai, NSW, 2234, Australia, emailb.begg@ansto.gov.au
E. R. Vance
Affiliation:
Materials Division, ANSTO, PMB 1, Menai, NSW, 2234, Australia, emailb.begg@ansto.gov.au
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Abstract

Zirconolite (CaZrTi2O7) is the primary actinide-bearing Synroc phase for the immobilisation of high-level nuclear waste. Using X-ray absorption spectroscopy and microanalysis we have investigated the incorporation of cerium, as a simulant for plutonium, on both zirconolite's Ca and Zr sites under a range of redox conditions. The Ce valence state was found to vary between Ce3+ and Ce4+ depending on the both the sintering atmosphere and temperature. The existence of alternative charge compensation schemes, predominantly cation vacancies, in addition to those used in the sample design was inferred in many of the zirconolites and will be discussed in detail.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 333
Copyright
Copyright © Materials Research Society 1997

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References

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