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Syntheses of Titanate-Based Hosts for the Immobilization of Pu(III) and Am(III)

Published online by Cambridge University Press:  03 September 2012

Shara S. Shoup  and
Carlos E. Bamberger
Shara S. Shoup
Affiliation:
Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831–6110.
Carlos E. Bamberger
Affiliation:
Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831–6110.
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Abstract

Syntheses of novel titanate-based waste forms, potentially suitable for immobilizing Pu(III) and Am(III), have been performed. The dititanate compounds An2Ti2O7 (An=Pu or Am) were found to have a monoclinic structure. A series of pyrochlore-type solid solutions between An2Ti2O7 and the cubic pyrochlore Ln2Ti2O7 (Ln=Gd, Er, or Lu) has been established, and limits of solid solubility for An2Ti2O7 were determined. These limits were found to increase as the ionic radius of the lanthanide in the host decreased. Strontium-containing titanate compounds SrAn2Ti4O12 were also prepared and were characterized as exhibiting a perovskite-type structure. Such compounds could serve as waste hosts for the immobilization of not only the actinide but also 90 Sr. A 2 month leaching study of Er1.78Pu0.22Ti2O7 and SrPu2Ti4O12 by WIPP “A” brine was performed. Very low amounts (< 1 ppm) of Pu(III) were leached. Although the ionic radius of Np(III) is similar to that of Pu(III) and Am(III), analogous Np compounds could not be prepared in any of the titanate systems investigated.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 379
Copyright
Copyright © Materials Research Society 1997

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