Blackburn, L.R. orcid.org/0000-0002-5889-2035, Sun, S., Gardner, L.J. orcid.org/0000-0003-3126-2583
et al. (3 more authors)
(2020)
A systematic investigation of the phase assemblage and microstructure of the zirconolite CaZr1-xCexTi2O7 system.
Journal of Nuclear Materials, 535.
152137.
ISSN 0022-3115
Abstract
A series of zirconolite ceramics with nominal stoichiometry CaZr1-xCexTi2O7 (0.0 ≤ x ≤ 0.4) were synthesised under oxidizing, inert and reducing conditions, by a conventional solid-state cold press and sinter method. The evolution of phase assemblage and microstructure were characterized by XRD, SEM-EDS, Ce-L3 XANES and Raman spectroscopy techniques. It was determined that the relative yield of zirconolite-2M and zirconolite-4M polytypes, alongside secondary perovskite phases, was influenced by processing environment via the control of Ce3+/4+ speciation. Oxidizing conditions produced a mixture of zirconolite-2M and zirconolite-4M polytypes due to the formation of Ce4+. Inert and reducing conditions yielded predominantly zirconolite-2M and a Ce-bearing perovskite phase through favouring Ce3+ speciation.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 The Authors. Published by Elsevier B.V. Under a Creative Commons license CC BY 4.0 https://creativecommons.org/licenses/by/4.0/ |
Keywords: | Cerium; Plutonium; Zirconolite; Immobilisation; Surrogate; Wasteform; Ceramic |
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/N017870/1 NUCLEAR DECOMMISSIONING AUTHORITY UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) UNSPECIFIED |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 20 May 2020 11:16 |
Last Modified: | 20 May 2020 11:16 |
Status: | Published |
Publisher: | Elsevier BV |
Refereed: | Yes |
Identification Number: | 10.1016/j.jnucmat.2020.152137 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:160985 |
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