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Temperature Dependence of Amorphization for Zirconolite and Perovskite Irradiated with 1 Mev Krypton Ions

Published online by Cambridge University Press:  15 February 2011

T. J. White ,
R. C. Ewing ,
L. M. Wang ,
J. S. Forrester  and
C. Montross
T. J. White
Affiliation:
Ian Wark Research Institute, The University of South Australia, Warrendi Road, The Levels, SA 5095, Australia
R. C. Ewing
Affiliation:
Department of Earth and Planetary Sciences, The University of New Mexico, Albuquerque NM 87131, USA
L. M. Wang
Affiliation:
Department of Earth and Planetary Sciences, The University of New Mexico, Albuquerque NM 87131, USA
J. S. Forrester
Affiliation:
Department of Mining and Metallurgical Engineering, The University of Queensland, Brisbane QLD 4075, Australia
C. Montross
Affiliation:
Department of Mining and Metallurgical Engineering, The University of Queensland, Brisbane QLD 4075, Australia
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Abstract

A transmission electron microscope investigation was made of zirconolites and perovskites irradiated to amorphization with 1 MeV krypton ions using the HVEM-Tandem Facility at Argonne National Laboratory. Three specimens were examined - a prototype zirconolite CaZrTi2O7, a gadolinium doped zirconolite Ca0.75Gd0.50Zr0.75Ti2O7and a uranium doped zirconolite Ca0.75U0.50Zr0.75Ti2O7. The critical amorphization dose Dc was determined at several temperatures between 20K to 675K. Dc was inversely proportional with temperature. For example, pure zirconolite requiring 10x the dose for amorphization at 475K compared with gadolinium zirconolite. Using an Arrhenius plot, the activation energy Ea for annealing in these compounds was found to be 0.129 eV and 0.067 eV respectively. The greater ease of amorphization for the gadolinium sample is probably a reflection of this element’s large cross section for interaction with heavy ions. Uranium zirconolite was very susceptible to damage and amorphised under 4 keV argon ions during the preparation of microscope specimens. In each sample, zirconolite coexisted with minor perovskite, reduced rutile (Magneli phases) and zirconia. These phases were more resistant to ion irradiation than zirconolite. Even for high gadolinium loadings, perovskite (Ca0.8Gd0.2TiO3) was 3-4 times more stable to ion irradiation than the surrounding zirconolite crystals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 1413
Copyright
Copyright © Materials Research Society 1995

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References

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