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The ion irradiation tolerance of the fluorite RE2MO5 (RE = Sm, and Yb, M = Ti, Zr, and Sn) system

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Abstract

In the search for novel ceramics for use within nuclear fuel–related applications and nuclear waste-form matrices, a major focus has been on the development of radiation-tolerant materials. Of particular interest in this field have been numerous compounds with either pyrochlore or the related fluorite-type structures. In this study, we look to expand the family of compounds with defect fluorite–type structure. We have fabricated three new compounds; Yb2Sn1.125O5.25, Yb2Sn1.25O5.5, and Yb2Sn1.375O5.75. The compound Yb2Sn1.125O5.25 was determined, via x-ray diffraction, to have the long-range defect fluorite structure, Fm-3 m symmetry, with cell parameter a = 5.17233(1). Further to this, Sm2ZrO5 and Yb2TiO5 compounds were also fabricated and crystal structures characterised. The use of transmission electron microscopy has revealed a much more complex crystal structure than that of the relatively high symmetry fluorite, with the presence of structural modulations being detected. The ion-irradiation response of these compounds was tested via bulk specimen irradiation using 15-MeV gold ions with grazing incidence x-ray diffraction characterisation. The results show that both Sm2ZrO5 and Yb2Sn1.25O5.5 are highly tolerant to ion-irradiation exposure whilst Yb2TiO5 is susceptible to amorphisation.

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Acknowledgements

The authors wish to thank Tim Palmer, NMDC, metallography, ANSTO, for his SEM specimen preparation.

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Authors and Affiliations

  1. Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, 2234, Australia

    Robert D. Aughterson, Mihail Ionescu & Gregory R. Lumpkin

  2. Intellectual Property Office, Concept House Cardiff Road, Newport, NP108QQ, South Wales, UK

    Robin Newman

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Aughterson, R.D., Newman, R., Ionescu, M. et al. The ion irradiation tolerance of the fluorite RE2MO5 (RE = Sm, and Yb, M = Ti, Zr, and Sn) system. J Aust Ceram Soc 58, 287–298 (2022). https://doi.org/10.1007/s41779-021-00689-9

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