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Temperature Dependence of Ion Irradiation Induced Amorphization of Zirconolite

Published online by Cambridge University Press:  10 February 2011

K.L. Smith ,
M.G. Blackford ,
G.R. Lumpkin  and
N.J. Zaluzec
K.L. Smith
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, P.M.B. 1, Menai, NSW 2234, AUSTRALIA
M.G. Blackford
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, P.M.B. 1, Menai, NSW 2234, AUSTRALIA
G.R. Lumpkin
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, P.M.B. 1, Menai, NSW 2234, AUSTRALIA
N.J. Zaluzec
Affiliation:
Materials Science Division, Argonne National Laboratory, 9700 South Cass Ave, Argonne, II 60439, USA
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Abstract

The critical dose for amorphisation, Dc, of two end-member zirconolites (CaZrTi2O7) with different stacking fault densities, was measured as a function of irradiation temperature from 20 K to 623 K using the HVEM-Tandem Facility at Argonne National Laboratory (ANL). Below 473 K, the Dc, values of both samples are identical within experimental error, showing only a small increase in Dc, from (2.5 to 4.6) × 1018 ions m−2 between 20 K and 473 K. At temperatures above 473 K, the data for the zirconolite containing many stacking faults is bracketed by two data sets from almost crystallographically perfect end-member zirconolites: one collected in this study and one collected in a previous study. The raw Dc versus temperature data from the zirconolites in this and a previous study suggest that the critical temperature above which samples cannot be amorphised and/or recrystallisation is complete, Tc, is between 600 and 1000 K. The data sets collected in this study are discussed in relation to a current model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 608: Symposium QQ – Scientific Basis for Nuclear Waste Management XXIII , 1999 , 487
Copyright
Copyright © Materials Research Society 2000

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References

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