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Bonato L, Virot M, Le Goff X, Moisy P, Nikitenko SI. Sonochemical dissolution of nanoscale ThO 2 and partial conversion into a thorium peroxo sulfate. ULTRASONICS SONOCHEMISTRY 2020; 69:105235. [PMID: 32619920 DOI: 10.1016/j.ultsonch.2020.105235] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 06/15/2020] [Accepted: 06/18/2020] [Indexed: 06/11/2023]
Abstract
The influence of the sample morphology and experimental conditions towards the sonochemical dissolution of nanoscale ThO2 samples in sulfuric acid media is described. Significant sonochemical dissolution rates and yields are observed at 20 kHz under Ar/O2 atmosphere in dilute 0.5 M H2SO4 at room temperature, contrasting with the generally-reported high refractory behavior for ThO2. The dissolution of ThO2 combines the physical effects driven by acoustic cavitation phenomenon, the complexing affinity of Th(IV) in sulfuric medium and the sonochemical generation of H2O2. These sonochemical conditions further allow the observation of the partial conversion of ThO2 into a scarce Th(IV) peroxo sulfate with 1D morphology resulting from one or both following processes: dissolution/reprecipitation or formation of an intermediate Th(IV) surface complex.
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Affiliation(s)
- Laura Bonato
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France
| | - Matthieu Virot
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - Xavier Le Goff
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France
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2
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Desfougeres L, Welcomme É, Ollivier M, Martin PM, Hennuyer J, Hunault MOJY, Podor R, Clavier N, Favergeon L. Oxidation as an Early Stage in the Multistep Thermal Decomposition of Uranium(IV) Oxalate into U3O8. Inorg Chem 2020; 59:8589-8602. [DOI: 10.1021/acs.inorgchem.0c01047] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lénaïc Desfougeres
- CEA, DES, ISEC, DMRC, Université Montpellier, Marcoule, France
- Mines Saint-Etienne, Université Lyon, CNRS, UMR 5307 LGF, Centre SPIN, F-42023 Saint-Etienne, France
- CEA, CNRS, ENSCM, ICSM, Université Montpellier, Bagnols-sur-Cèze, France
| | | | - Maelig Ollivier
- Mines Saint-Etienne, Université Lyon, CNRS, UMR 5307 LGF, Centre SPIN, F-42023 Saint-Etienne, France
| | | | - Julie Hennuyer
- CEA, DES, ISEC, DMRC, Université Montpellier, Marcoule, France
| | | | - Renaud Podor
- CEA, CNRS, ENSCM, ICSM, Université Montpellier, Bagnols-sur-Cèze, France
| | - Nicolas Clavier
- ICSM, Université Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France
| | - Loïc Favergeon
- Mines Saint-Etienne, Université Lyon, CNRS, UMR 5307 LGF, Centre SPIN, F-42023 Saint-Etienne, France
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3
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Manaud J, Maynadié J, Mesbah A, Hunault MOJY, Martin PM, Zunino M, Meyer D, Dacheux N, Clavier N. Hydrothermal Conversion of Uranium(IV) Oxalate into Oxides: A Comprehensive Study. Inorg Chem 2020; 59:3260-3273. [DOI: 10.1021/acs.inorgchem.9b03672] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jérémie Manaud
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | - Jérôme Maynadié
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | - Adel Mesbah
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | | | - Philippe M. Martin
- CEA, DEN, DMRC, Universite Montpellier, Marcoule, 30207 Bagnols-sur-Cèze, France
| | - Morgan Zunino
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | - Daniel Meyer
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | - Nicolas Dacheux
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | - Nicolas Clavier
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
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4
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Bonato L, Virot M, Dumas T, Mesbah A, Dalodière E, Dieste Blanco O, Wiss T, Le Goff X, Odorico M, Prieur D, Rossberg A, Venault L, Dacheux N, Moisy P, Nikitenko SI. Probing the local structure of nanoscale actinide oxides: a comparison between PuO 2 and ThO 2 nanoparticles rules out PuO 2+x hypothesis. NANOSCALE ADVANCES 2020; 2:214-224. [PMID: 36134012 PMCID: PMC9418969 DOI: 10.1039/c9na00662a] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 11/26/2019] [Indexed: 06/01/2023]
Abstract
Actinide research at the nanoscale is gaining fundamental interest due to environmental and industrial issues. The knowledge of the local structure and speciation of actinide nanoparticles, which possibly exhibit specific physico-chemical properties in comparison to bulk materials, would help in a better and reliable description of their behaviour and reactivity. Herein, the synthesis and relevant characterization of PuO2 and ThO2 nanoparticles displayed as dispersed colloids, nanopowders, or nanostructured oxide powders allow to establish a clear relationship between the size of the nanocrystals constituting these oxides and their corresponding An(iv) local structure investigated by EXAFS spectroscopy. Particularly, the first oxygen shell of the probed An(iv) evidences an analogous behaviour for both Pu and Th oxides. This observation suggests that the often observed and controversial splitting of the Pu-O shell on the Fourier transformed EXAFS signal of the PuO2 samples is attributed to a local structural disorder driven by a nanoparticle surface effect rather than to the presence of PuO2+x species.
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Affiliation(s)
- Laura Bonato
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | - Matthieu Virot
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | - Thomas Dumas
- CEA, DEN, DMRC, Univ Montpellier Marcoule France
| | - Adel Mesbah
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | | | - Oliver Dieste Blanco
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU) Postfach 2340 76125 Karlsruhe Germany
| | - Thierry Wiss
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU) Postfach 2340 76125 Karlsruhe Germany
| | - Xavier Le Goff
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | | | - Damien Prieur
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology Bautzner Landstraße 400 01328 Dresden Germany
| | - André Rossberg
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology Bautzner Landstraße 400 01328 Dresden Germany
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5
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Desigan N, Bhatt N, Shetty MA, Sreekumar GKP, Pandey NK, Kamachi Mudali U, Natarajan R, Joshi JB. Dissolution of nuclear materials in aqueous acid solutions. REV CHEM ENG 2019. [DOI: 10.1515/revce-2017-0063] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The quantitative understanding of the dissolution of nuclear fuel materials is essential for the process design and development of an industrial-scale nuclear fuel reprocessing plant. The main objective of this review article is to analyze the published data related to the dissolution of important nuclear materials, namely, urania, plutonia, thoria, and their oxides in the existing literature. The published results on rate-controlling step and reaction mechanism of dissolution processes are reconciled and reviewed in this work. Clear suggestions are made for future research work for the identification of rate-controlling step. Suggestions are also provided to overcome the shortfalls in the published data for the identification of intrinsic kinetics and mass-transfer rates.
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Bao H, Duan P, Zhou J, Cao H, Li J, Yu H, Jiang Z, Liu H, Zhang L, Lin J, Chen N, Lin X, Liu Y, Huang Y, Wang JQ. Uranium-Induced Changes in Crystal-Field and Covalency Effects of Th4+ in Th1–xUxO2 Mixed Oxides Probed by High-Resolution X-ray Absorption Spectroscopy. Inorg Chem 2018; 57:11404-11413. [DOI: 10.1021/acs.inorgchem.8b01142] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hongliang Bao
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
| | - Peiquan Duan
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
- University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Jing Zhou
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
| | - Hanjie Cao
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
- University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Jiong Li
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
| | - Haisheng Yu
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
| | - Zheng Jiang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
| | - Hongtao Liu
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
| | - Linjuan Zhang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
| | - Jian Lin
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
| | - Ning Chen
- Canadian Light Source, University of Saskatchewan, Saskatoon, Saskatchewan S7N 2 V3, Canada
| | - Xiao Lin
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
- University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Yancheng Liu
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
| | - Yuying Huang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
| | - Jian-Qiang Wang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China
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7
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Trillaud V, Maynadié J, Manaud J, Hidalgo J, Meyer D, Podor R, Dacheux N, Clavier N. Synthesis of size-controlled UO2 microspheres from the hydrothermal conversion of U(iv) aspartate. CrystEngComm 2018. [DOI: 10.1039/c8ce01352g] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A wet chemistry route towards UO2 spherical particles was designed through the hydrothermal conversion of uranium(iv) aspartate. A multi-parametric study led us to point out the conditions leading to monodisperse and size-controlled particles in the 400–2500 nm range. This simple protocol paves the way to applications in various scientific areas.
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Affiliation(s)
| | | | | | | | - D. Meyer
- ICSM
- CEA
- CNRS
- ENSCM
- Univ Montpellier
| | - R. Podor
- ICSM
- CEA
- CNRS
- ENSCM
- Univ Montpellier
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8
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Neumeier S, Arinicheva Y, Ji Y, Heuser JM, Kowalski PM, Kegler P, Schlenz H, Bosbach D, Deissmann G. New insights into phosphate based materials for the immobilisation of actinides. RADIOCHIM ACTA 2017. [DOI: 10.1515/ract-2017-2819] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
This paper focuses on major phosphate-based ceramic materials relevant for the immobilisation of Pu, minor actinides, fission and activation products. Key points addressed include the recent progress regarding synthesis methods, the formation of solid solutions by structural incorporation of actinides or their non-radioactive surrogates and waste form fabrication by advanced sintering techniques. Particular attention is paid to the properties that govern the long-term stability of the waste forms under conditions relevant to geological disposal. The paper highlights the benefits gained from synergies of state-of-the-art experimental approaches and advanced atomistic modeling tools for addressing properties and stability of f-element-bearing phosphate materials. In conclusion, this article provides a perspective on the recent advancements in the understanding of phosphate based ceramics and their properties with respect to their application as nuclear waste forms.
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Affiliation(s)
- Stefan Neumeier
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research – Nuclear Waste Management and Reactor Safety (IEK-6) , 52425 Jülich , Germany ; JARA High-Performance Computing , Schinkelstrasse 2 , 52062 Aachen , Germany
| | - Yulia Arinicheva
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research – Nuclear Waste Management and Reactor Safety (IEK-6) , 52425 Jülich , Germany ; JARA High-Performance Computing , Schinkelstrasse 2 , 52062 Aachen , Germany
- Forschungszentrum Jülich, Institute of Energy and Climate Research – Materials Synthesis and Processing (IEK-1) , 52425 Jülich , Germany
| | - Yaqi Ji
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research – Nuclear Waste Management and Reactor Safety (IEK-6) , 52425 Jülich , Germany ; JARA High-Performance Computing , Schinkelstrasse 2 , 52062 Aachen , Germany
| | - Julia M. Heuser
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research – Nuclear Waste Management and Reactor Safety (IEK-6) , 52425 Jülich , Germany ; JARA High-Performance Computing , Schinkelstrasse 2 , 52062 Aachen , Germany
- Karlsruhe Institute of Technology, Institute for Applied Materials (IAM) , 76021 Karlsruhe , Germany
| | - Piotr M. Kowalski
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research – Nuclear Waste Management and Reactor Safety (IEK-6) , 52425 Jülich , Germany ; JARA High-Performance Computing , Schinkelstrasse 2 , 52062 Aachen , Germany
| | - Philip Kegler
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research – Nuclear Waste Management and Reactor Safety (IEK-6) , 52425 Jülich , Germany ; JARA High-Performance Computing , Schinkelstrasse 2 , 52062 Aachen , Germany
| | - Hartmut Schlenz
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research – Nuclear Waste Management and Reactor Safety (IEK-6) , 52425 Jülich , Germany ; JARA High-Performance Computing , Schinkelstrasse 2 , 52062 Aachen , Germany
| | - Dirk Bosbach
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research – Nuclear Waste Management and Reactor Safety (IEK-6) , 52425 Jülich , Germany ; JARA High-Performance Computing , Schinkelstrasse 2 , 52062 Aachen , Germany
| | - Guido Deissmann
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research – Nuclear Waste Management and Reactor Safety (IEK-6) , 52425 Jülich , Germany ; JARA High-Performance Computing , Schinkelstrasse 2 , 52062 Aachen , Germany
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9
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Cherkaski Y, Clavier N, Brissonneau L, Podor R, Dacheux N. Densification behavior and microstructure evolution of yttrium-doped ThO 2 ceramics. Ann Ital Chir 2017. [DOI: 10.1016/j.jeurceramsoc.2017.04.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Activation energy determination and kinetic modeling of thorium oxide dissolution in nitric acid/ hydrofluoric acid system: Influence of fluoride ion on ThO 2 dissolution. PROGRESS IN NUCLEAR ENERGY 2016. [DOI: 10.1016/j.pnucene.2016.09.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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11
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Simonnet M, Barré N, Drot R, Naour CL, Sladkov V, Delpech S. Multiparametric study of thorium oxide dissolution in aqueous media. RADIOCHIM ACTA 2016. [DOI: 10.1515/ract-2016-2607] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Thorium oxide is poorly soluble: unlike uranium oxide, concentrated nitric acid medium is not sufficient to get quantitative dissolution. Addition of small amounts of fluoride is required to achieve thorium oxide total dissolution. The effect of several parameters on thorium oxide dissolution in order to optimize the dissolution conditions is reported in this paper. Thus the influence of solid characteristics, dissolution method, temperature and composition of dissolution medium on ThO2 dissolution rate has been studied. No complexing agents tested other than fluoride allows total dissolution. Beyond a given HF concentration a decrease of the dissolution rate is observed due to the formation of a precipitate at the solid/solution interface. It was demonstrated by XPS measurements that this precipitate is constituted of thorium fluoride (ThF4) formed during the ThO2 dissolution. The low concentration of HF required to achieve a total dissolution and the activation energy value measured tends to show a catalytic effect of HF on the dissolution process.
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Affiliation(s)
- Marie Simonnet
- Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - Nicole Barré
- Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - Romuald Drot
- Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - Claire Le Naour
- Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - Vladimir Sladkov
- Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - Sylvie Delpech
- Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
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12
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Corkhill CL, Bailey DJ, Tocino FY, Stennett MC, Miller JA, Provis JL, Travis KP, Hyatt NC. Role of Microstructure and Surface Defects on the Dissolution Kinetics of CeO2, a UO2 Fuel Analogue. ACS APPLIED MATERIALS & INTERFACES 2016; 8:10562-10571. [PMID: 27022662 DOI: 10.1021/acsami.5b11323] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The release of radionuclides from spent fuel in a geological disposal facility is controlled by the surface mediated dissolution of UO2 in groundwater. In this study we investigate the influence of reactive surface sites on the dissolution of a synthesized CeO2 analogue for UO2 fuel. Dissolution was performed on the following: CeO2 annealed at high temperature, which eliminated intrinsic surface defects (point defects and dislocations); CeO2-x annealed in inert and reducing atmospheres to induce oxygen vacancy defects and on crushed CeO2 particles of different size fractions. BET surface area measurements were used as an indicator of reactive surface site concentration. Cerium stoichiometry, determined using X-ray Photoelectron Spectroscopy (XPS) and supported by X-ray Diffraction (XRD) analysis, was used to determine oxygen vacancy concentration. Upon dissolution in nitric acid medium at 90 °C, a quantifiable relationship was established between the concentration of high energy surface sites and CeO2 dissolution rate; the greater the proportion of intrinsic defects and oxygen vacancies, the higher the dissolution rate. Dissolution of oxygen vacancy-containing CeO2-x gave rise to rates that were an order of magnitude greater than for CeO2 with fewer oxygen vacancies. While enhanced solubility of Ce(3+) influenced the dissolution, it was shown that replacement of vacancy sites by oxygen significantly affected the dissolution mechanism due to changes in the lattice volume and strain upon dissolution and concurrent grain boundary decohesion. These results highlight the significant influence of defect sites and grain boundaries on the dissolution kinetics of UO2 fuel analogues and reduce uncertainty in the long term performance of spent fuel in geological disposal.
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Affiliation(s)
- Claire L Corkhill
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, The University of Sheffield , Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Daniel J Bailey
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, The University of Sheffield , Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Florent Y Tocino
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, The University of Sheffield , Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Martin C Stennett
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, The University of Sheffield , Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - James A Miller
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, The University of Sheffield , Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - John L Provis
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, The University of Sheffield , Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Karl P Travis
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, The University of Sheffield , Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Neil C Hyatt
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, The University of Sheffield , Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
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13
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Beaudoux X, Virot M, Chave T, Leturcq G, Jouan G, Venault L, Moisy P, Nikitenko SI. Ultrasound-assisted reductive dissolution of CeO2and PuO2in the presence of Ti particles. Dalton Trans 2016; 45:8802-15. [DOI: 10.1039/c5dt04931h] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PuO2is considered an important material for current and future nuclear fuel; however it is a very refractive compound towards dissolution.
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Affiliation(s)
- Xavier Beaudoux
- Institut de Chimie Séparative de Marcoule ICSM-UMR5257 CNRS/CEA/UM/ENCSM
- 30207 Bagnols sur Cèze
- France
- CEA/DEN/MAR/DRCP
- Nuclear Energy Division
| | - Matthieu Virot
- Institut de Chimie Séparative de Marcoule ICSM-UMR5257 CNRS/CEA/UM/ENCSM
- 30207 Bagnols sur Cèze
- France
| | - Tony Chave
- Institut de Chimie Séparative de Marcoule ICSM-UMR5257 CNRS/CEA/UM/ENCSM
- 30207 Bagnols sur Cèze
- France
| | - Gilles Leturcq
- CEA/DEN/MAR/DRCP
- Nuclear Energy Division
- Radiochemistry and Process Department
- 30207 Bagnols sur Cèze
- France
| | | | - Laurent Venault
- CEA/DEN/MAR/DRCP
- Nuclear Energy Division
- Radiochemistry and Process Department
- 30207 Bagnols sur Cèze
- France
| | - Philippe Moisy
- CEA/DEN/MAR/DRCP
- Nuclear Energy Division
- Radiochemistry and Process Department
- 30207 Bagnols sur Cèze
- France
| | - Sergey I. Nikitenko
- Institut de Chimie Séparative de Marcoule ICSM-UMR5257 CNRS/CEA/UM/ENCSM
- 30207 Bagnols sur Cèze
- France
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14
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Corkhill CL, Stennett MC, Hyatt NC. Solution Composition Effects on the Dissolution of a CeO2 analogue for UO2 and ThO2 nuclear fuels. ACTA ACUST UNITED AC 2015. [DOI: 10.1557/opl.2015.334] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTThis study investigates the dissolution of CeO2, an isostructural analogue for UO2 and ThO2, which was synthesized to closely approximate the microstructure of a spent nuclear fuel matrix. Dissolution of CeO2 particles was performed in simplified solutions representative of saline, near-neutral and alkaline ground waters that may be encountered in geological disposal scenarios, and in acidic medium for comparison. The normalized mass loss of cerium was found to be significantly influenced by the formation of colloidal particles, especially in the near-neutral and alkaline solutions investigated. The normalized dissolution rate, RL(Ce), k (g m-2 d-1), in these two solutions was found to be similar, but significantly lower than in a nitric acid medium. The activation energies based on the normalized release rate of cerium, at 40°C, 70°C and 90°C in each solution, were in the range of 24 ± 3 kJ mol-1 to 27 ± 7 kJ mol-1, indicative of a surface-mediated dissolution mechanism. The mechanism of dissolution was postulated to be similar in each of the solutions investigated, and further work is proposed to investigate the role of carbonate on the CeO2 dissolution mechanism.
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15
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Ikeuchi H, Ishihara M, Yano K, Kaji N, Nakajima Y, Washiya T. Dissolution behavior of (U,Zr)O2-based simulated fuel debris in nitric acid. J NUCL SCI TECHNOL 2014. [DOI: 10.1080/00223131.2014.924445] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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16
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Abraham F, Arab-Chapelet B, Rivenet M, Tamain C, Grandjean S. Actinide oxalates, solid state structures and applications. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2013.08.036] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Dissolution of uranium mixed oxides: The role of oxygen vacancies vs the redox reactions. PROGRESS IN NUCLEAR ENERGY 2014. [DOI: 10.1016/j.pnucene.2013.09.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Nkou Bouala GI, Clavier N, Podor R, Cambedouzou J, Mesbah A, Brau HP, Léchelle J, Dacheux N. Preparation and characterisation of uranium oxides with spherical shapes and hierarchical structures. CrystEngComm 2014. [DOI: 10.1039/c4ce00850b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One of the first reports on shape-controlled uranium oxides with hierarchical structures and their mechanism of formation.
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Affiliation(s)
| | | | - R. Podor
- ICSM
- UMR 5257 CEA/CNRS/UM2/ENSCM
- , France
| | | | - A. Mesbah
- ICSM
- UMR 5257 CEA/CNRS/UM2/ENSCM
- , France
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20
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Reid D, Stennett M, Hyatt N. The fluorite related modulated structures of the Gd2(Zr2−xCex)O7 solid solution: An analogue for Pu disposition. J SOLID STATE CHEM 2012. [DOI: 10.1016/j.jssc.2011.12.039] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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21
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Horlait D, Clavier N, Szenknect S, Dacheux N, Dubois V. Dissolution of cerium(IV)-lanthanide(III) oxides: comparative effect of chemical composition, temperature, and acidity. Inorg Chem 2012; 51:3868-78. [PMID: 22375608 DOI: 10.1021/ic300071c] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The dissolution of Ce(1-x)Ln(x)O(2-x/2) solid solutions was undertaken in various acid media in order to evaluate the effects of several physicochemical parameters such as chemical composition, temperature, and acidity on the reaction kinetics. The normalized dissolution rates (R(L,0)) were found to be strongly modified by the trivalent lanthanide incorporation rate, due to the presence of oxygen vacancies decreasing the samples cohesion. Conversely, the nature of the trivalent cation considered only weakly impacted the R(L,0) values. The dependence of the normalized dissolution rates on the temperature then appeared to be of the same order of magnitude than that of chemical composition. Moreover, it allowed determining the corresponding activation energy (E(A) ≈ 60-85 kJ·mol(-1)) which accounts for a dissolution driven by surface-controlled reactions. A similar conclusion was made regarding the acidity of the solution: the partial order related to (H(3)O(+)) reaching about 0.7. Finally, the prevailing effect of the incorporation of aliovalent cations in the fluorite-type CeO(2) matrix on the dissolution kinetics precluded the observation of slight effects such as those linked to the complexing agents or to the crystal structure of the samples.
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Affiliation(s)
- D Horlait
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM, Site de Marcoule-Bât. 426, BP 17171, 30207 Bagnols/Cèze, Cedex, France
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22
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Virot M, Chave T, Horlait D, Clavier N, Dacheux N, Ravaux J, Nikitenko SI. Catalytic dissolution of ceria under mild conditions. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31996a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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