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
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: |
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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: | https://doi.org/10.1016/j.jnucmat.2020.152137 |