Discovery of a maximum damage structure for Xe-irradiated borosilicate glass ceramics containing powellite

Patel, Karishma B. and Peuget, Sylvain and Schuller, Sophie and Lampronti, Giulio I. and Facq, Sébastien P. and Grygiel, Clara and Monnet, Isabelle and Farnan, Ian (2018) Discovery of a maximum damage structure for Xe-irradiated borosilicate glass ceramics containing powellite. Journal of Nuclear Materials, 510. pp. 229-242. ISSN 00223115 DOI https://doi.org/10.1016/j.jnucmat.2018.08.012

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Official URL: https://doi.org/10.1016/j.jnucmat.2018.08.012

Abstract

In order to increase the waste loading efficiency in nuclear waste glasses, alternate glass ceramic (GC) materials are sought that trap problematic molybdenum in a water-durable CaMoO4 phase within a borosilicate glass matrix. In order to test the radiation resistance of these candidate wasteforms, accelerated external radiation can be employed to replicate long-term damage. In this study, several glasses and GCs were synthesized with up to 10 mol% MoO3 and subjected to 92 MeV Xe ions with fluences ranging between 5 × 1012 to 1.8 × 1014 ions/cm2. The main mechanisms of modification following irradiation involve: (i) thermal and defect-assisted diffusion, (ii) relaxation from the ion's added energy, (iii) localized damage recovery from overlapping ion tracks, and (iv) the accumulation of point defects or the formation of voids that created significant strain and led to longer-range modifications. Most significantly, a saturation in alteration could be detected for fluences greater than 4 × 1013 ions/cm2, which represents an average structure that is representative of the maximum damage state from these competing mechanisms. The results from this study can therefore be used for long-term structural projections in the development of more complex GCs for nuclear waste applications.

Item Type: Article
Uncontrolled Keywords: 2018AREP; IA74
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
08 - Green Open Access
Journal or Publication Title: Journal of Nuclear Materials
Volume: 510
Page Range: pp. 229-242
Identification Number: https://doi.org/10.1016/j.jnucmat.2018.08.012
Depositing User: Sarah Humbert
Date Deposited: 08 Feb 2019 12:43
Last Modified: 12 Sep 2019 09:41
URI: http://eprints.esc.cam.ac.uk/id/eprint/4418

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