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Huang H, Wang P, Yan C, Yu X, Cao C, Lin J, Zhu Z. Fabrication of crack-free oxidic thorium–cerium microspheres by an external gelation process. ANN NUCL ENERGY 2023. [DOI: 10.1016/j.anucene.2023.109757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
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2
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Manaud J, Maynadié J, Mesbah A, Hunault MOJY, Martin PM, Zunino M, Dacheux N, Clavier N. Hydrothermal Conversion of Thorium Oxalate into ThO 2· nH 2O Oxide. Inorg Chem 2020; 59:14954-14966. [PMID: 32996765 DOI: 10.1021/acs.inorgchem.0c01633] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Hydrothermal conversion of thorium oxalate, Th(C2O4)2·nH2O, into thorium dioxide was explored through a multiparametric study, leading to some guidelines for the preparation of crystallized samples with the minimum amount of impurities. As the formation of the oxide appeared to be operated through the hydrolysis of Th4+ after decomposition of oxalate fractions, pH values typically above 1 must be considered to recover a solid phase. Also, because of the high stability of the thorium oxalate precursor, hydrothermal treatments of more than 5 h at a temperature above 220 °C were required. All the ThO2·nH2O samples prepared presented amounts of residual carbon and water in the range 0.2-0.3 wt % and n ≈ 0.5, respectively. A combined FTIR, PXRD, and EXAFS study showed that these impurities mainly consisted of carbonates trapped between elementary nanosized crystallites, rather than substituted directly in the lattice, which generated a tensile effect over the crystal lattice. The presence of carbonates at the surface of the elementary crystallites could also explain their tendency to self-assembly, leading to the formation of spherical aggregates. Hydrothermal conversion of oxalates could then find its place in different processes of the nuclear fuel cycle, where it will provide an interesting opportunity to set up dustless routes leading from ions in solution to dioxide powders in a limited number of steps.
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Affiliation(s)
- Jérémie Manaud
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France
| | - Jérôme Maynadié
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France
| | - Adel Mesbah
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France
| | - Myrtille O J Y Hunault
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192 Gif-sur-Yvette, France
| | | | - Morgan Zunino
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France
| | - Nicolas Dacheux
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France
| | - Nicolas Clavier
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France
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3
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4
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Ghosh PS, Arya A. Structural, thermodynamic, electronic and elastic properties of Th 1-xU xO 2 and Th 1-xPu xO 2 mixed oxides. Phys Chem Chem Phys 2020; 22:6406-6417. [PMID: 32149299 DOI: 10.1039/d0cp00220h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structural, thermodynamic, electronic, and elastic properties of Th1-xUxO2 and Th1-xPuxO2 mixed oxides (MOX) have been calculated with Hubbard corrected density functional theory (DFT+U) to account for the strong 5f electron correlations. The ideal solid solution is approximated by special quasi-random structures and the U-ramping method is used to account for the presence of metastable states in the self-consistent field solution of the DFT+U approach. The mixing enthalpy (ΔHmix) is positive throughout the composition range of the Th1-xUxO2 MOX, consistent with a simple miscibility gap (at low temperature) phase diagram. The behavior of the Th1-xPuxO2 MOX is more complex, where ΔHmix is positive in the ThO2-rich region and negative in the PuO2-rich region. Electronic structure analysis shows that substitution of Th by U/Pu in ThO2 leads to a reduction of the average Th-O bond lengths, causing distortion in the crystal structure. The distortion in the crystal structure results in an increase in the conduction bandwidth and a reduction of the band-gap in the MOX. Good agreement of our DFT+U calculated elastic properties of ThO2, UO2 and PuO2 compounds with experiments leads to convincing prediction of these properties for Th1-xUxO2 and Th1-xPuxO2 MOX.
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Affiliation(s)
- P S Ghosh
- Glass & Advanced Materials Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
| | - A Arya
- Glass & Advanced Materials Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
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5
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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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6
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Epifano E, Naji M, Manara D, Scheinost AC, Hennig C, Lechelle J, Konings RJM, Guéneau C, Prieur D, Vitova T, Dardenne K, Rothe J, Martin PM. Extreme multi-valence states in mixed actinide oxides. Commun Chem 2019. [DOI: 10.1038/s42004-019-0161-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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7
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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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8
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Clavier N, Cherkaski Y, Martinez J, Costis S, Cordara T, Audubert F, Brissonneau L, Dacheux N. Synthesis and Direct Sintering of Nanosized (M
IV
,M
III
)O
2‐
x
Hydrated Oxides as Electrolyte Ceramics. Chemphyschem 2017; 18:2666-2674. [DOI: 10.1002/cphc.201700647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Revised: 07/18/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Nicolas Clavier
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257, CEA, CNRS, ENSCMUniv. Montpellier Site de Marcoule—Bât. 426, BP 17171 30207 Bagnols/Cèze France
| | - Yanis Cherkaski
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257, CEA, CNRS, ENSCMUniv. Montpellier Site de Marcoule—Bât. 426, BP 17171 30207 Bagnols/Cèze France
- CEA/DEN/DTN/SMTA/LIPC Site de Cadarache 13108 St-Paul lez Durance France
| | - Julien Martinez
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257, CEA, CNRS, ENSCMUniv. Montpellier Site de Marcoule—Bât. 426, BP 17171 30207 Bagnols/Cèze France
- CEA/DEN/DMRC/SECA/LFC Site de Marcoule-Bât. 399, BP 17171 30207 Bagnols/Cèze France
| | - Sophie Costis
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257, CEA, CNRS, ENSCMUniv. Montpellier Site de Marcoule—Bât. 426, BP 17171 30207 Bagnols/Cèze France
| | - Théo Cordara
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257, CEA, CNRS, ENSCMUniv. Montpellier Site de Marcoule—Bât. 426, BP 17171 30207 Bagnols/Cèze France
| | - Fabienne Audubert
- CEA/DEN/DEC/SA3C/LAMIR Site de Cadarache 13108 St-Paul lez Durance France
| | | | - Nicolas Dacheux
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257, CEA, CNRS, ENSCMUniv. Montpellier Site de Marcoule—Bât. 426, BP 17171 30207 Bagnols/Cèze France
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9
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Bocharov D, Chollet M, Krack M, Bertsch J, Grolimund D, Martin M, Kuzmin A, Purans J, Kotomin E. Analysis of the U L 3 -edge X-ray absorption spectra in UO 2 using molecular dynamics simulations. PROGRESS IN NUCLEAR ENERGY 2017. [DOI: 10.1016/j.pnucene.2016.07.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Pai RV, Bamankar YR, Yadav AK, Bhattacharyya D, Jha SN, Kasar UM, Krishnan K, Sali SK, Radhakrishna J. Synthesis, thermal characterization and local structure studies of Gd doped Th 0.7U 0.3O 2 using X-ray absorption spectroscopy. RSC Adv 2016. [DOI: 10.1039/c6ra07621a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
(Th0.7−xU0.3Gdx)O2+y microspheres where x = 0, 0.05, 0.10 and 0.15 were prepared by internal gelation method.
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Affiliation(s)
| | | | | | | | - S. N. Jha
- Atomic & Molecular Physics Division
- India
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11
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Direct Compositional Characterization of (U,Th)O2 Powders, Microspheres, and Pellets Using TXRF. Anal Chem 2015; 87:10262-7. [DOI: 10.1021/acs.analchem.5b01824] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Vigier JF, Martin PM, Martel L, Prieur D, Scheinost AC, Somers J. Structural Investigation of (U0.7Pu0.3)O2-x Mixed Oxides. Inorg Chem 2015; 54:5358-65. [DOI: 10.1021/acs.inorgchem.5b00392] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jean-François Vigier
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, 76125 Karlsruhe, Germany
| | | | - Laura Martel
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, 76125 Karlsruhe, Germany
| | - Damien Prieur
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, 76125 Karlsruhe, Germany
| | - Andreas C. Scheinost
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, D-01314 Dresden, Germany
| | - Joseph Somers
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, 76125 Karlsruhe, Germany
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13
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Liu B, Aidhy DS, Zhang Y, Weber WJ. Theoretical investigation of thermodynamic stability and mobility of the oxygen vacancy in ThO2-UO2 solid solutions. Phys Chem Chem Phys 2014; 16:25461-7. [PMID: 25342500 DOI: 10.1039/c4cp03660c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The thermodynamic stability and the migration energy barriers of oxygen vacancies in ThO2-UO2 solid solutions are investigated by density functional theory calculations. In pure ThO2, the formation energy of the oxygen vacancy is 7.58 eV and 1.46 eV under O rich and O poor conditions, respectively, while its migration energy barrier is 1.97 eV. The addition of UO2 into ThO2 significantly decreases the energetics of formation and migration of the oxygen vacancy. Among the range of UO2-ThO2 solid solutions studied in this work, UO2 exhibits the lowest formation energy (5.99 eV and -0.13 eV under O rich and O poor conditions, respectively) and Th0.25U0.75O2 exhibits the lowest migration energy barrier (∼1 eV). Furthermore, by considering chemical potential, the phase diagram of the oxygen vacancy as a function of both temperature and oxygen partial pressure is shown, which could help to gain experimental control over oxygen vacancy concentration.
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Affiliation(s)
- B Liu
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
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14
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Shi WQ, Yuan LY, Wang CZ, Wang L, Mei L, Xiao CL, Zhang L, Li ZJ, Zhao YL, Chai ZF. Exploring actinide materials through synchrotron radiation techniques. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:7807-7848. [PMID: 25169914 DOI: 10.1002/adma.201304323] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Revised: 04/24/2014] [Indexed: 06/03/2023]
Abstract
Synchrotron radiation (SR) based techniques have been utilized with increasing frequency in the past decade to explore the brilliant and challenging sciences of actinide-based materials. This trend is partially driven by the basic needs for multi-scale actinide speciation and bonding information and also the realistic needs for nuclear energy research. In this review, recent research progresses on actinide related materials by means of various SR techniques were selectively highlighted and summarized, with the emphasis on X-ray absorption spectroscopy, X-ray diffraction and scattering spectroscopy, which are powerful tools to characterize actinide materials. In addition, advanced SR techniques for exploring future advanced nuclear fuel cycles dealing with actinides are illustrated as well.
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Affiliation(s)
- Wei-Qun Shi
- Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Institute of High Enegy Physics, Chinese Academy of Sciences, Beijing, 100049, China
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15
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Cozzo C, Orlov A, Borca C, Degueldre C. X-ray absorption in plutonium uranium mixed oxide fuel: Thorium characterization. PROGRESS IN NUCLEAR ENERGY 2014. [DOI: 10.1016/j.pnucene.2013.09.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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16
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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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17
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Labs S, Hennig C, Weiss S, Curtius H, Zänker H, Bosbach D. Synthesis of coffinite, USiO4, and structural investigations of UxTh(1-x)SiO4 solid solutions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 48:854-860. [PMID: 24289534 DOI: 10.1021/es403995b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The miscibility behavior of the USiO4-ThSiO4 system was investigated. The end members and 10 solid solutions UxTh(1-x)SiO4 with x = 0.12-0.92 were successfully synthesized, without formation of other secondary uranium or thorium phases. Lattice parameters of the solid solutions evidently follow Vegard's Law. Investigation of the local structure with EXAFS reveals small differences between the U and Th environment attributed to different atomic radii of the metal atoms but no implications for a miscibility gap. The data provided confirm complete miscibility for the system USiO4-ThSiO4. The structure of the end members was studied in detail with XRD and discussed with special regard to the oxygen positions and the often neglected Si-O bond length. USiO4 could be obtained without UO2 impurities and the lattice parameters derived from Rietveld refinement as c = 6.2606(3) Å and a = 6.9841(3) Å. The Si-O distance in USiO4 appears to be 1.64 Å, which is more reasonable than earlier reported values.
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Affiliation(s)
- Sabrina Labs
- Insitute of Energy and Climate Research (IEK-6), Nuclear Waste Management, Forschungszentrum Jülich GmbH , Wilhelm-Johnen-Straße, 54245 Jülich, Germany
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18
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Carvajal-Nunez U, Prieur D, Vitova T, Somers J. Charge Distribution and Local Structure of Americium-Bearing Thorium Oxide Solid Solutions. Inorg Chem 2012; 51:11762-8. [DOI: 10.1021/ic301709d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- U. Carvajal-Nunez
- European Commission, Joint Research
Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - D. Prieur
- European Commission, Joint Research
Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - T. Vitova
- Institut für Nukleare Entsorgung (INE), Hermann-von-Helmholtz-Platz,
76344 Eggenstein-Leopoldshafen, Germany
| | - J. Somers
- European Commission, Joint Research
Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
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19
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Srihari V, Sridharan V, Nomura M, Sastry VS, Sundar CS. Local structural studies of the cubic Cd1-xCaxO system through Cd K-edge extended X-ray absorption spectroscopic studies. JOURNAL OF SYNCHROTRON RADIATION 2012; 19:541-6. [PMID: 22713887 PMCID: PMC3583624 DOI: 10.1107/s0909049512018419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 04/24/2012] [Indexed: 06/01/2023]
Abstract
Cd K-edge extended X-ray absorption fine-structure spectroscopic studies were carried out on Cd(1-x)Ca(x)O (0 ≤ x ≤0.9) solid solutions and the first and second nearest neighbour (NN) distances and their mean square relative displacement σ(2) were estimated. The first NN distance, d(Cd-O)(x), was found to be smaller than its expected value, a(x)/2, obtained from the X-ray diffraction measurements. It increases monotonically and non-linearly with a negative curvature, comparable with that of the a(x) value variation. The variation σ(2) of the 1NN with x is consistent with a disordered solid solution model. The 2NN distances d(Cd-Cd)(x) and d(Cd-Ca)(x) are found to follow the average values obtained by X-ray diffraction with d(Cd-Ca)(x) > d(Cd-Cd)(x). From detailed analysis it is argued that the solid solution exhibits a bimodal distribution of the 1NN distances, d(Cd-O)(x) and d(Ca-O)(x), and that the system belongs to a persistent type.
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Affiliation(s)
- Velaga Srihari
- Surface Physics Division, Saha Institute of Nuclear Physics, Kalkata 700064, India
| | - V. Sridharan
- Condensed Matter Physics Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - Masaharu Nomura
- Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Oho 1-1, Tsukuba 305-0801, Japan
| | - V. Sankara Sastry
- Condensed Matter Physics Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - C. S Sundar
- Condensed Matter Physics Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
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20
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Costin D, Mesbah A, Clavier N, Szenknect S, Dacheux N, Poinssot C, Ravaux J, Brau H. Preparation and characterization of synthetic Th0.5U0.5SiO4 uranothorite. PROGRESS IN NUCLEAR ENERGY 2012. [DOI: 10.1016/j.pnucene.2011.10.004] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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21
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Silva GWC, Hunn JD, Yeamans C, Cerefice GS, Czerwinski KR. Fluoride-conversion synthesis of homogeneous actinide oxide solid solutions. Inorg Chem 2011; 50:11004-10. [PMID: 21995875 DOI: 10.1021/ic201552g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis of (U,Th)O(2) solid solutions at a relatively low temperature of 1100 °C using a new technique is described. First, separate actinide oxides were reacted with ammonium hydrogen fluoride to form ammonium actinide fluorides at room temperature. Subsequently, this fluoride was converted to an actinide oxide solid solution using a two-phase reaction process, which involved heating of the fluoride first at 610 °C in static air followed by heating at 1100 °C in flowing argon. Oxide solid solutions of UO(2) and ThO(2) were synthesized for a ThO(2) content from 10 to 90 wt %. Microscopic investigation showed that the (U,Th)O(2) solid solutions synthesized using this method had high crystallinity and homogeneity up to nanoscale.
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Affiliation(s)
- G W Chinthaka Silva
- Harry Reid Center for Environmental Studies, University of Nevada, Las Vegas, Box 454009, 4505 Maryland Parkway, Las Vegas, Nevada 89154, USA.
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22
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Costin DT, Mesbah A, Clavier N, Dacheux N, Poinssot C, Szenknect S, Ravaux J. How To Explain the Difficulties in the Coffinite Synthesis from the Study of Uranothorite? Inorg Chem 2011; 50:11117-26. [DOI: 10.1021/ic2016758] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- D. T. Costin
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM, Site de Marcoule − Bât. 426, BP 17171, 30207 Bagnols/Cèze cedex, France
| | - A. Mesbah
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM, Site de Marcoule − Bât. 426, BP 17171, 30207 Bagnols/Cèze cedex, France
| | - N. Clavier
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM, Site de Marcoule − Bât. 426, BP 17171, 30207 Bagnols/Cèze cedex, France
| | - N. Dacheux
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM, Site de Marcoule − Bât. 426, BP 17171, 30207 Bagnols/Cèze cedex, France
| | - C. Poinssot
- CEA, Nuclear Energy Division, DEN/DRCP/DIR, CEA Marcoule − Bât. 400, BP 17171, 30207 Bagnols/Cèze cedex, France
| | - S. Szenknect
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM, Site de Marcoule − Bât. 426, BP 17171, 30207 Bagnols/Cèze cedex, France
| | - J. Ravaux
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM, Site de Marcoule − Bât. 426, BP 17171, 30207 Bagnols/Cèze cedex, France
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23
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Local structure in solid solutions of stabilised zirconia with actinide dioxides (UO2, NpO2). J SOLID STATE CHEM 2011. [DOI: 10.1016/j.jssc.2011.02.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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24
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Hubert S, Heisbourg G, Dacheux N, Moisy P. Effect of Inorganic Ligands and Hydrogen Peroxide on ThO2 Dissolution. Behaviour of Th0.87Pu0.13O2 during Leaching Test. Inorg Chem 2008; 47:2064-73. [DOI: 10.1021/ic702065z] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Solange Hubert
- Institut de Physique Nucléaire (IN2P3/CNRS-UMR8608), Université Paris Sud, 91406 Orsay, France, and CEA/VALRHO DRCP/SCPS, BP 17171, 30207 Bagnols/Cèze Cedex, France
| | - Guillaume Heisbourg
- Institut de Physique Nucléaire (IN2P3/CNRS-UMR8608), Université Paris Sud, 91406 Orsay, France, and CEA/VALRHO DRCP/SCPS, BP 17171, 30207 Bagnols/Cèze Cedex, France
| | - Nicolas Dacheux
- Institut de Physique Nucléaire (IN2P3/CNRS-UMR8608), Université Paris Sud, 91406 Orsay, France, and CEA/VALRHO DRCP/SCPS, BP 17171, 30207 Bagnols/Cèze Cedex, France
| | - Philippe Moisy
- Institut de Physique Nucléaire (IN2P3/CNRS-UMR8608), Université Paris Sud, 91406 Orsay, France, and CEA/VALRHO DRCP/SCPS, BP 17171, 30207 Bagnols/Cèze Cedex, France
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