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Radiation Stability of Ceramic Waste Forms Determined by In Situ Electron Microscopy and He Ion Irradiation

Published online by Cambridge University Press:  25 February 2011

T.J. White ,
H. Mitamura ,
K. Hojou  and
S. Furuno
T.J. White
Affiliation:
Ian Wark Research Institute, The University of South Australia, PO Box 1 Ingle Farm, SA 5098 Australia
H. Mitamura
Affiliation:
Department of Environmental Safety Research, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki, Japan 319-11
K. Hojou
Affiliation:
Department of Materials and Engineering, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki, Japan 319-11
S. Furuno
Affiliation:
Department of Materials and Engineering, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki, Japan 319-11
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Abstract

The radiation stability of polyphase titanate ceramic waste forms was studied using analytical transmission electron microscopy, in combination with in situ irradiation by 30 keV He ions, followed by staged annealing. Two experiments were conducted. In the first, a reconnaissance investigation was made of the stabilities of the synthetic minerals hollandite, zirconolite, and perovskite when subjected to a total dose of 1.8 × 1017 He+ cm-2. It was found that all phases amorphized at approximately the same rate, but perovskite recovered its structure more rapidly and at lower temperatures than the other phases. In particular, annealing for 10 minutes at 1000°C was sufficient for perovskite to completely regain its crystallinity, while zirconolite and hollandite were only partially restored by these conditions. In the second experiment, the response of a thin hollandite crystal to irradiation was examined by selected area electron diffraction. At a dose of 1.5 × 1015 He+ cm-2its incommensurate superstructure was disrupted, but even at a dose of 3 × 1016 He cm-2 the hollandite subcell was largely intact. For this dose, total recovery was achieved by annealing for 1 minute at 1000°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 333: Symposium V – Scientific Basis for Nuclear Waste Management XVII , 1993 , 227
Copyright
Copyright © Materials Research Society 1994

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References

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