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Plutonium and Neptunium Incorporation inZirconolite

Published online by Cambridge University Press:  03 September 2012

B. D. Begg ,
E. R. Vance ,
R.A Day ,
M. Hambley  and
S. D. Conradson
B. D. Begg
Affiliation:
Materials Division, ANSTO, PMB 1, Menai, NSW 2234, Australia, email b.begg@ansto.gov.au
E. R. Vance
Affiliation:
Materials Division, ANSTO, PMB 1, Menai, NSW 2234, Australia, email b.begg@ansto.gov.au
R.A Day
Affiliation:
Materials Division, ANSTO, PMB 1, Menai, NSW 2234, Australia, email b.begg@ansto.gov.au
M. Hambley
Affiliation:
Materials Division, ANSTO, PMB 1, Menai, NSW 2234, Australia, email b.begg@ansto.gov.au
S. D. Conradson
Affiliation:
Los Alamos National Laboratory, New Mexico, USA
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Abstract

The incorporation of Pu and Np in zirconolite (CaZrTi2O7) has been investigated over a range ofredox conditions. Zirconolite formulations designed to favour eithertrivalent or tetravalent Pu and Np were prepared by limiting the amount ofcharge compensating additives available to maintain electroneutrality. Fromnear-edge X-ray absorption spectroscopy the Pu valence state was found tovary with the processing atmosphere, from completely tetravalent when firedin air, and located on either the Ca or Zr sites, to trivalent, whensubstituted on the Ca site after annealing in 3.5% H2/N2. Np was predominantly tetravalent over therange of redox conditions examined and was readily incorporated on either ofzirconolite's Ca or Zr sites. The charge compensation mechanisms at work indifferent zirconolites are also discussed.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 325
Copyright
Copyright © Materials Research Society 1997

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References

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