Ding, W orcid.org/0000-0003-3002-5068, Botha, JA, Hanson, BC orcid.org/0000-0002-1720-1656 et al. (1 more author) (2016) Aqueous hydroxylation mediated synthesis of crystalline calcium uranate particles. Journal of Alloys and Compounds, 688 (Part B). pp. 260-269. ISSN 0925-8388
Abstract
Metal uranates(VI) are solubility limiting U(VI) phases under high pH conditions and may act as suitable long-term wasteforms. The precipitation and thermal phase development mechanisms of calcium uranate particles formed via aqueous hydroxylation reactions are studied in order to address the lack of aqueous synthesis methods currently available. Hydrous Ca-deficient uranate particles formed from aqueous solutions saturated in U(VI) oligomers were found to thermally decompose via several weight-loss steps between 100 and 800 °C. Crystalline calcium uranate (Ca2U3O11) is initially formed at 700 °C via dehydration and dehydroxylation-olation reactions under redox-neutral conditions. This initial phase decomposes to biphasic CaUO4-UO2 particles at 800 °C via a reductive pathway.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | Uranate; U(VI); Synthesis; Precipitation; Particles; Crystallisation |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Institute for Particle Science and Engineering (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 21 Jul 2016 11:03 |
Last Modified: | 02 Aug 2019 09:32 |
Published Version: | http://dx.doi.org/10.1016/j.jallcom.2016.07.140 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.jallcom.2016.07.140 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:102556 |