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HREM and Image Simulation of Short-Range-Order Domains in Ion Irradiated Zirconolite

Published online by Cambridge University Press:  02 July 2020

S. X. Wang ,
L. M. Wang  and
R. C. Ewing
S. X. Wang
Affiliation:
Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, MI48109-2104.
L. M. Wang
Affiliation:
Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, MI48109-2104.
R. C. Ewing
Affiliation:
Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, MI48109-2104.
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Extract

Zirconolite (CaZrTi2O7) is an important phase proposed for immobilization of plutonium. Radiation effects in zirconolite were studied by 1 MeV Kr+ and 1.5 MeV Xe+ irradiation at various temperatures. Zirconolite became amorphous at temperatures below a critical temperature, Tc. The critical temperature was found to be a function of ion species: Tc - 654 K for 1 MeV Kr+ and 710 K for 1.5 MeV Xe+. The temperature dependence of amorphization dose is shown in FIG. 1. Above Tc, the specimen remained crystalline after prolonged irradiation (up to 3.6×l015 ions/cm2). However, the high-temperature irradiated zirconolite was transformed into the fluorite structure (as shown by the strong diffraction maxima in FIG. 2). In addition to the maxima from the fluorite structure, strong diffuse maxima were observed surrounding the Bragg position of pyrochlore superlattice (FIG. 2).

Type
Ceramics & Minerals
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 392 - 393
Copyright
Copyright © Microscopy Society of America

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References

References:

1.Wang, S. X., et al., Nucl. Instrum. Meth. B148 (1999) 704.CrossRefGoogle Scholar
2.Okamoto, P. R. and Thomas, G., Acta Metall. 19 (1971) 825.CrossRefGoogle Scholar
3. This work was supported by the Office of Basic Energy Sciences, U.S. Department of Energy under grant DE-FG02-97ER45656.Google Scholar