Bailey, D.J. orcid.org/0000-0002-0313-8748, Johnstone, E.V. orcid.org/0000-0001-7358-8085, Stennett, M.C. orcid.org/0000-0002-8363-9103 et al. (2 more authors) (2023) An investigation of iodovanadinite wasteforms for the immobilisation of radio-iodine and technetium. Ceramics, 6 (3). pp. 1826-1839. ISSN 2571-6131
Abstract
99Tc and 129I are two long-lived, highly soluble and mobile fission products that pose a long-term hazard. A proposed wasteform for the disposal of radio-iodine is iodovanadinite (Pb5(VO4)3I), an apatite-structured vanadate. In this investigation, a suite of potential iodovanadinite wasteforms designed for the co-disposal of Tc and I or the sole disposal of I were synthesised via hot isostatic pressing (with Mo as a surrogate for Tc). It was found that direct synthesis from oxide and iodide precursors was possible using hot isostatic pressing (HIPing). Increasing overpressure during HIPing was found to improve the density of the final product. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses indicated that the use of AgI as the source of iodine affected the formation of the target iodovanadinite phase and produced unfavourable phase assemblages. Here, we report the direct synthesis of Pb5(VO4)3I in a single step by hot isostatic pressing.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 by the authors. Licensee MDPI, Basel, Switzerland. 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: | ceramic; iodine; technetium; immobilisation; radioactive; nuclear; waste |
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/M026566/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/N017374/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/S032959/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/S011935/1 Engineering and Physical Sciences Research Council EP/S01019X/1 Engineering and Physical Sciences Research Council EP/T011424/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 11 Sep 2023 15:38 |
Last Modified: | 11 Sep 2023 15:38 |
Status: | Published |
Publisher: | MDPI AG |
Refereed: | Yes |
Identification Number: | 10.3390/ceramics6030111 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:203260 |