Kuman, M., Gardner, L.J., Blackburn, L.R. et al. (3 more authors) (2023) Investigation of the effect of milling duration on a Ce-Gd doped zirconolite phase assemblage synthesised by hot isostatic pressing. Ceramics, 6 (1). pp. 707-716. ISSN 2571-6131
Abstract
Zirconolite is a candidate ceramic wasteform under consideration for the immobilisation of the UK civil PuO2 inventory. In the present work, a baseline dual-substituted zirconolite with the target composition (Ca0.783Gd0.017Ce0.2)(Zr0.883Gd0.017Ce0.1)(Ti1.6Al0.4)O7 was fabricated by hot isostatic pressing (HIPing). In order to optimise the microstructure properties and improve the obtained yield of the zirconolite phase, a range of planetary ball milling parameters were investigated prior to consolidation by HIP. This included milling the batched oxide precursors at 400 rpm for up to 120 min, the pre-milling of CeO2 (PuO2 surrogate) to reduce the particle size and using a CeO2 source with finer particle size (<5 µm). The HIPed zirconolite product consisted of both zirconolite-2M and zirconolite-3T polytypes in varying proportions; however, an additional perovskite phase was obtained in varying quantities as a secondary phase. Ce L3-edge X-ray absorption spectroscopy was utilised to determine the Ce oxidation state. In this study, the ideal milling parameter for the fabrication of zirconolite waste forms was defined as 60 min at 400 rpm.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 by the authors. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
Keywords: | zirconolite; plutonium; HIP; XRD; SEM; XANES |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/N017617/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/N017374/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/P013600/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/S032959/1 Engineering and Physical Sciences Research Council EP/S01019X/1 Engineering and Physical Sciences Research Council EP/T011424/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 21 Apr 2023 14:27 |
Last Modified: | 21 Apr 2023 14:27 |
Status: | Published |
Publisher: | MDPI AG |
Refereed: | Yes |
Identification Number: | 10.3390/ceramics6010043 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:198356 |