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TEM Study of Neutron Irradiated Synroc

Published online by Cambridge University Press:  10 February 2011

Katherine L. Smith ,
Mark G. Blackford  and
Gregory R. Lumpkin
Katherine L. Smith
Affiliation:
Materials Div., Australian Nuclear Science and Technology Organisation, Private Mail Bag I, Menai, NSW 2234, Australia
Mark G. Blackford
Affiliation:
Materials Div., Australian Nuclear Science and Technology Organisation, Private Mail Bag I, Menai, NSW 2234, Australia
Gregory R. Lumpkin
Affiliation:
Materials Div., Australian Nuclear Science and Technology Organisation, Private Mail Bag I, Menai, NSW 2234, Australia
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Abstract

Synroc is a candidate waste form for the immobilisation of high level radioactive waste (HLW)[1]. It is polyphase titanate ceramic principally comprised of zirconolite, hollandite perovskite and rutile (nominally CaZrTi2O7, (BaxCsy)[(Ti3+, Al)2x+y(Ti4+)8−2x−y]O16), CaTiO3 and TiO2 respectively). Waste species substitute into the three former phases. In particular, actinides (ACTs) substitute onto the Ca and Zr sites in zirconolite and the Ca site in perovskite. Consequently over time, these phases will suffer alpha-recoil and alpha particle damage while hollandite and rutile will suffer alpha particle damage. The effect of radiation damage on the structure and consequently on the durability of Synroc's constituent phases is important to predictive modelling of Synroc's behaviour in the repository environment and risk assessment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 506: Symposium – Scientific Basis for Nuclear Waste Management XXI , 1997 , 929
Copyright
Copyright © Materials Research Society 1998

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References

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