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Intergrowth Structures in Synthetic Pyrochlores: Implications for Radiation Damage Effects and Waste Form Formulation

Published online by Cambridge University Press:  10 February 2011

E. C. Buck ,
D. B. Chamberlain  and
R. Gieré
E. C. Buck
Affiliation:
Chemical Technology Division, Argonne National Laboratory, Argonne, IL 60439
D. B. Chamberlain
Affiliation:
Chemical Technology Division, Argonne National Laboratory, Argonne, IL 60439
R. Gieré
Affiliation:
Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907-1397
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Abstract

Titanate-based ceramic waste forms are currently under development for the immobilization of excess weapons plutonium. Both Hf and Gd are added to the ceramic formulation as neutron absorbers in order to satisfy a defense-in-depth concept for the waste form. The introduction of significant amounts of hafnium may be responsible for the presence of zirconolite-2M crystals in pyrochlore-based ceramics and the formation of zirconolite lamellae within pyrochlore. The zirconolite grows epitaxially on { 111 }planes of pyrochlore. Although the zirconolite lamellae within pyrochlore are non-cubic, any volume expansion due to radiation damage in the pyrochlore should still be isotropic; in addition, the presence of these intergrowths may allow some stress relief in the ceramic.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 19
Copyright
Copyright © Materials Research Society 1999

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References

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