1
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Uranium oxides structural transformation in human body liquids. Sci Rep 2023; 13:4088. [PMID: 36906622 PMCID: PMC10008576 DOI: 10.1038/s41598-023-31059-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 03/06/2023] [Indexed: 03/13/2023] Open
Abstract
Uranium oxide microparticles ingestion is one of the potential sources of internal radiation doses to the humans at accidental or undesirable releases of radioactive materials. It is important to predict the obtained dose and possible biological effect of these microparticles by studying uranium oxides transformations in case of their ingestion or inhalation. Using a combination of methods, a complex examination of structural changes of uranium oxides in the range from UO2 to U4O9, U3O8 and UO3 as well as before and after exposure of uranium oxides in simulated biological fluids: gastro-intestinal and lung-was carried out. Oxides were thoroughly characterized by Raman and XAFS spectroscopy. It was determined that the duration of expose has more influence on all oxides transformations. The greatest changes occurred in U4O9, that transformed into U4O9-y. UO2.05 and U3O8 structures became more ordered and UO3 did not undergo significant transformation.
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2
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Abstract
Three uranyl borates, UO2B2O4, LiUO2BO3 and NaUO2BO3, have been prepared by solid state syntheses. The influence of the crystallographic structure on the splitting of the empty 5f and 6d states have been probed using High Energy Resolved Fluorescence Detected X-ray Absorption Spectroscopy (HERFD-XAS) at the uranium M4-edge and L3-edge respectively. We demonstrate that the 5f splitting is increased by the decrease of the uranyl U-Oax distance, which in turn correlates with an increased bond covalency. This is correlated to the equatorial coordination change of the uranium. The role of the alkalis as charge compensating the axial oxygen of the uranyl is discussed.
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3
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Darapaneni P, Meyer AM, Sereda M, Bruner A, Dorman JA, Lopata K. Simulated field-modulated x-ray absorption in titania. J Chem Phys 2020; 153:054110. [PMID: 32770877 DOI: 10.1063/5.0009677] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this paper, we present a method to compute the x-ray absorption near-edge structure (XANES) spectra of solid-state transition metal oxides using real-time time-dependent density functional theory, including spin-orbit coupling effects. This was performed on bulk-mimicking anatase titania (TiO2) clusters, which allows for the use of hybrid functionals and atom-centered all electron basis sets. Furthermore, this method was employed to calculate the shifts in the XANES spectra of the Ti L-edge in the presence of applied electric fields to understand how external fields can modify the electronic structure, and how this can be probed using x-ray absorption spectroscopy. Specifically, the onset of t2g peaks in the Ti L-edge was observed to red shift and the eg peaks were observed to blue shift with increasing fields, attributed to changes in the hybridization of the conduction band (3d) orbitals.
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Affiliation(s)
- Pragathi Darapaneni
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Alexander M Meyer
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Mykola Sereda
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Adam Bruner
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - James A Dorman
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Kenneth Lopata
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
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4
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Martin PG, Louvel M, Cipiccia S, Jones CP, Batey DJ, Hallam KR, Yang IAX, Satou Y, Rau C, Mosselmans JFW, Richards DA, Scott TB. Provenance of uranium particulate contained within Fukushima Daiichi Nuclear Power Plant Unit 1 ejecta material. Nat Commun 2019; 10:2801. [PMID: 31243294 PMCID: PMC6594968 DOI: 10.1038/s41467-019-10937-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 06/11/2019] [Indexed: 11/09/2022] Open
Abstract
Here we report the results of multiple analytical techniques on sub-mm particulate material derived from Unit 1 of the Fukushima Daiichi Nuclear Power Plant to provide a better understanding of the events that occurred and the environmental legacy. Through combined x-ray fluorescence and absorption contrast micro-focused x-ray tomography, entrapped U particulate are observed to exist around the exterior circumference of the highly porous Si-based particle. Further synchrotron radiation analysis of a number of these entrapped particles shows them to exist as UO2-identical to reactor fuel, with confirmation of their nuclear origin shown via mass spectrometry analysis. While unlikely to represent an environmental or health hazard, such assertions would likely change should break-up of the Si-containing bulk particle occur. However, more important to the long-term decommissioning of the reactors at the FDNPP (and environmental clean-upon), is the knowledge that core integrity of reactor Unit 1 was compromised with nuclear material existing outside of the reactors primary containment.
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Affiliation(s)
- Peter G Martin
- Interface Analysis Centre, School of Physics, HH Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK.
| | - Marion Louvel
- Department of Earth Sciences, University of Cambridge, Bullard Laboratories, Madingley Road, Cambridge, CB3 0EZ, UK
| | - Silvia Cipiccia
- Diamond Light Source, Harwell Science and Innovation Park, Didcot, OX, OX11 0DE, UK
| | - Christopher P Jones
- Interface Analysis Centre, School of Physics, HH Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK
| | - Darren J Batey
- Diamond Light Source, Harwell Science and Innovation Park, Didcot, OX, OX11 0DE, UK
| | - Keith R Hallam
- Interface Analysis Centre, School of Physics, HH Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK
| | - Ian A X Yang
- Interface Analysis Centre, School of Physics, HH Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK
| | - Yukihiko Satou
- Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency, Tomioka-Machi, Futaba-gun, Fukushima, 979-1151, Japan
| | - Christoph Rau
- Diamond Light Source, Harwell Science and Innovation Park, Didcot, OX, OX11 0DE, UK
| | - J Fred W Mosselmans
- Diamond Light Source, Harwell Science and Innovation Park, Didcot, OX, OX11 0DE, UK
| | - David A Richards
- School of Geographical Sciences, University of Bristol, Bristol, BS8 1SS, UK
| | - Thomas B Scott
- Interface Analysis Centre, School of Physics, HH Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK
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5
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Hunault MOJY, Lelong G, Cormier L, Galoisy L, Solari PL, Calas G. Speciation Change of Uranyl in Lithium Borate Glasses. Inorg Chem 2019; 58:6858-6865. [DOI: 10.1021/acs.inorgchem.9b00305] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Gérald Lelong
- Sorbonne Université, Muséum National d’Histoire Naturelle, UMR CNRS 7590, IRD, Institut de Minéralogie, de Physique des Matériaux et Cosmochimie, IMPMC, 75005 Paris, France
| | - Laurent Cormier
- Sorbonne Université, Muséum National d’Histoire Naturelle, UMR CNRS 7590, IRD, Institut de Minéralogie, de Physique des Matériaux et Cosmochimie, IMPMC, 75005 Paris, France
| | - Laurence Galoisy
- Sorbonne Université, Muséum National d’Histoire Naturelle, UMR CNRS 7590, IRD, Institut de Minéralogie, de Physique des Matériaux et Cosmochimie, IMPMC, 75005 Paris, France
| | - Pier-Lorenzo Solari
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin BP 48, 91192 Gif-sur-Yvette, France
| | - Georges Calas
- Sorbonne Université, Muséum National d’Histoire Naturelle, UMR CNRS 7590, IRD, Institut de Minéralogie, de Physique des Matériaux et Cosmochimie, IMPMC, 75005 Paris, France
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X-ray Absorption Fine Structure (XAFS) Studies of Oxide Glasses-A 45-Year Overview. MATERIALS 2018; 11:ma11020204. [PMID: 29382102 PMCID: PMC5848901 DOI: 10.3390/ma11020204] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 01/15/2018] [Accepted: 01/19/2018] [Indexed: 12/04/2022]
Abstract
X-ray Absorption Fine Structure (XAFS) spectroscopy has been widely used to characterize the short-range order of glassy materials since the theoretical basis was established 45 years ago. Soon after the technique became accessible, mainly due to the existence of Synchrotron laboratories, a wide range of glassy materials was characterized. Silicate glasses have been the most studied because they are easy to prepare, they have commercial value and are similar to natural glasses, but borate, germanate, phosphate, tellurite and other less frequent oxide glasses have also been studied. In this manuscript, we review reported advances in the structural characterization of oxide-based glasses using this technique. A focus is on structural characterization of transition metal ions, especially Ti, Fe, and Ni, and their role in different properties of synthetic oxide-based glasses, as well as their important function in the formation of natural glasses and magmas, and in nucleation and crystallization. We also give some examples of XAFS applications for structural characterization of glasses submitted to high pressure, glasses used to store radioactive waste and medieval glasses. This updated, comprehensive review will likely serve as a useful guide to clarify the details of the short-range structure of oxide glasses.
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7
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Lee JW, Singh SP, Kim M, Hong SU, Park WB, Sohn KS. Metaheuristics-Assisted Combinatorial Screening of Eu 2+-Doped Ca-Sr-Ba-Li-Mg-Al-Si-Ge-N Compositional Space in Search of a Narrow-Band Green Emitting Phosphor and Density Functional Theory Calculations. Inorg Chem 2017; 56:9814-9824. [PMID: 28776994 DOI: 10.1021/acs.inorgchem.7b01341] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A metaheuristics-based design would be of great help in relieving the enormous experimental burdens faced during the combinatorial screening of a huge, multidimensional search space, while providing the same effect as total enumeration. In order to tackle the high-throughput powder processing complications and to secure practical phosphors, metaheuristics, an elitism-reinforced nondominated sorting genetic algorithm (NSGA-II), was employed in this study. The NSGA-II iteration targeted two objective functions. The first was to search for a higher emission efficacy. The second was to search for narrow-band green color emissions. The NSGA-II iteration finally converged on BaLi2Al2Si2N6:Eu2+ phosphors in the Eu2+-doped Ca-Sr-Ba-Li-Mg-Al-Si-Ge-N compositional search space. The BaLi2Al2Si2N6:Eu2+ phosphor, which was synthesized with no human intervention via the assistance of NSGA-II, was a clear single phase and gave an acceptable luminescence. The BaLi2Al2Si2N6:Eu2+ phosphor as well as all other phosphors that appeared during the NSGA-II iterations were examined in detail by employing powder X-ray diffraction-based Rietveld refinement, X-ray absorption near edge structure, density functional theory calculation, and time-resolved photoluminescence. The thermodynamic stability and the band structure plausibility were confirmed, and more importantly a novel approach to the energy transfer analysis was also introduced for BaLi2Al2Si2N6:Eu2+ phosphors.
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Affiliation(s)
- Jin-Woong Lee
- Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University , Seoul 143-747, South Korea
| | - Satendra Pal Singh
- Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University , Seoul 143-747, South Korea
| | - Minseuk Kim
- Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University , Seoul 143-747, South Korea
| | - Sung Un Hong
- Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University , Seoul 143-747, South Korea
| | - Woon Bae Park
- Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University , Seoul 143-747, South Korea
| | - Kee-Sun Sohn
- Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University , Seoul 143-747, South Korea
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8
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Leinders G, Bes R, Pakarinen J, Kvashnina K, Verwerft M. Evolution of the Uranium Chemical State in Mixed-Valence Oxides. Inorg Chem 2017; 56:6784-6787. [PMID: 28590135 DOI: 10.1021/acs.inorgchem.7b01001] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A fundamental question concerning the chemical state of uranium in the binary oxides UO2, U4O9, U3O7, U3O8, and UO3 is addressed. By utilizing high energy resolution fluorescence detection X-ray absorption near edge spectroscopy (HERFD-XANES) at the uranium M4 edge, a novel technique in the tender X-ray region, we obtain the distribution of formal oxidation states in the mixed-valence oxides U4O9, U3O7, and U3O8. Moreover, we clearly identify a pivot from U(IV)-U(V) to U(V)-U(VI) charge compensation, corresponding with transition from a fluorite-type structure (U3O7) to a layered structure (U3O8). Such physicochemical properties are of interest to a broad audience of researchers and engineers active in domains ranging from fundamental physics to nuclear industry and environmental science.
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Affiliation(s)
- Gregory Leinders
- Belgian Nuclear Research Centre (SCK·CEN), Institute for Nuclear Materials Science , Boeretang 200, B-2400 Mol, Belgium
| | - René Bes
- Department of Applied Physics, Aalto University , P.O. Box 14100, FI-00076 Aalto, Finland
| | - Janne Pakarinen
- Belgian Nuclear Research Centre (SCK·CEN), Institute for Nuclear Materials Science , Boeretang 200, B-2400 Mol, Belgium
| | - Kristina Kvashnina
- Rossendorf Beamline at ESRF - The European Synchrotron, CS40220 , 38043 Grenoble Cedex 9, France.,Helmholtz Zentrum Dresden-Rossendorf (HZDR), Institute of Resource Ecology , P.O. Box 510119, 01314 Dresden, Germany
| | - Marc Verwerft
- Belgian Nuclear Research Centre (SCK·CEN), Institute for Nuclear Materials Science , Boeretang 200, B-2400 Mol, Belgium
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9
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High-resolution X-ray absorption spectroscopy as a probe of crystal-field and covalency effects in actinide compounds. Proc Natl Acad Sci U S A 2016; 113:8093-7. [PMID: 27370799 DOI: 10.1073/pnas.1601741113] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Applying the high-energy resolution fluorescence-detection (HERFD) mode of X-ray absorption spectroscopy (XAS), we were able to probe, for the first time to our knowledge, the crystalline electric field (CEF) splittings of the [Formula: see text] shell directly in the HERFD-XAS spectra of actinides. Using ThO2 as an example, data measured at the Th 3d edge were interpreted within the framework of the Anderson impurity model. Because the charge-transfer satellites were also resolved in the HERFD-XAS spectra, the analysis of these satellites revealed that ThO2 is not an ionic compound as previously believed. The Th [Formula: see text] occupancy in the ground state was estimated to be twice that of the Th [Formula: see text] states. We demonstrate that HERFD-XAS allows for characterization of the CEF interaction and degree of covalency in the ground state of actinide compounds as it is extensively done for 3d transition metal systems.
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10
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Zhang L, Zhou J, Zhang J, Su J, Zhang S, Chen N, Jia Y, Li J, Wang Y, Wang JQ. Extraction of local coordination structure in a low-concentration uranyl system by XANES. JOURNAL OF SYNCHROTRON RADIATION 2016; 23:758-768. [PMID: 27140156 DOI: 10.1107/s1600577516001910] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 02/01/2016] [Indexed: 06/05/2023]
Abstract
Obtaining structural information of uranyl species at an atomic/molecular scale is a critical step to control and predict their physical and chemical properties. To obtain such information, experimental and theoretical L3-edge X-ray absorption near-edge structure (XANES) spectra of uranium were studied systematically for uranyl complexes. It was demonstrated that the bond lengths (R) in the uranyl species and relative energy positions (ΔE) of the XANES were determined as follows: ΔE1 = 168.3/R(U-Oax)(2) - 38.5 (for the axial plane) and ΔE2 = 428.4/R(U-Oeq)(2) - 37.1 (for the equatorial plane). These formulae could be used to directly extract the distances between the uranium absorber and oxygen ligand atoms in the axial and equatorial planes of uranyl ions based on the U L3-edge XANES experimental data. In addition, the relative weights were estimated for each configuration derived from the water molecule and nitrate ligand based on the obtained average equatorial coordination bond lengths in a series of uranyl nitrate complexes with progressively varied nitrate concentrations. Results obtained from XANES analysis were identical to that from extended X-ray absorption fine-structure (EXAFS) analysis. XANES analysis is applicable to ubiquitous uranyl-ligand complexes, such as the uranyl-carbonate complex. Most importantly, the XANES research method could be extended to low-concentration uranyl systems, as indicated by the results of the uranyl-amidoximate complex (∼40 p.p.m. uranium). Quantitative XANES analysis, a reliable and straightforward method, provides a simplified approach applied to the structural chemistry of actinides.
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Affiliation(s)
- Linjuan Zhang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Jing Zhou
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Jianyong Zhang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Jing Su
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Shuo Zhang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Ning Chen
- Canadian Light Source, Saskatoon, Saskatchewan, Canada S7N 2V3
| | - Yunpeng Jia
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Jiong Li
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Yu Wang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Jian Qiang Wang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
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Déjeant A, Galoisy L, Roy R, Calas G, Boekhout F, Phrommavanh V, Descostes M. Evolution of uranium distribution and speciation in mill tailings, COMINAK Mine, Niger. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 545-546:340-352. [PMID: 26747998 DOI: 10.1016/j.scitotenv.2015.12.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 12/05/2015] [Accepted: 12/06/2015] [Indexed: 06/05/2023]
Abstract
This study investigated the evolution of uranium distribution and speciation in mill tailings from the COMINAK mine (Niger), in production since 1978. A multi-scale approach was used, which combined high resolution remote sensing imagery, ICP-MS bulk rock analyses, powder X-ray diffraction, Scanning Electron Microscopy, Focused Ion Beam--Transmission Electron Microscopy and X-ray Absorption Near Edge Spectroscopy. Mineralogical analyses showed that some ore minerals, including residual uraninite and coffinite, undergo alteration and dissolution during tailings storage. The migration of uranium and other contaminants depends on (i) the chemical stability of secondary phases and sorbed species (dissolution and desorption processes), and (ii) the mechanical transport of fine particles bearing these elements. Uranium is stabilized after formation of secondary uranyl sulfates and phosphates, and adsorbed complexes on mineral surfaces (e.g. clay minerals). In particular, the stock of insoluble uranyl phosphates increases with time, thus contributing to the long-term stabilization of uranium. At the surface, a sulfate-cemented duricrust is formed after evaporation of pore water. This duricrust limits water infiltration and dust aerial dispersion, though it is enriched in uranium and many other elements, because of pore water rising from underlying levels by capillary action. Satellite images provided a detailed description of the tailings pile over time and allow monitoring of the chronology of successive tailings deposits. Satellite images suggest that uranium anomalies that occur at deep levels in the pile are most likely former surface duricrusts that have been buried under more recent tailings.
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Affiliation(s)
- Adrien Déjeant
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Case 115, 4 place Jussieu, 75005 Paris, France; Université Paris Diderot - Paris VII, 5 rue Thomas Mann, 75013 Paris, France.
| | - Laurence Galoisy
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Case 115, 4 place Jussieu, 75005 Paris, France; Université Pierre et Marie Curie - Paris VI, 4 place Jussieu, 75005 Paris, France
| | - Régis Roy
- AREVA Mines - Geoscience Department, Tour AREVA, 1 place Jean Millier, 92084 Paris, La Défense, France
| | - Georges Calas
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Case 115, 4 place Jussieu, 75005 Paris, France; Université Pierre et Marie Curie - Paris VI, 4 place Jussieu, 75005 Paris, France
| | - Flora Boekhout
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Case 115, 4 place Jussieu, 75005 Paris, France; Université Pierre et Marie Curie - Paris VI, 4 place Jussieu, 75005 Paris, France
| | - Vannapha Phrommavanh
- AREVA Mines - R&D Department, BAL 0414C-2, Tour AREVA, 1 place Jean Millier, 92084 Paris, La Défense, France
| | - Michael Descostes
- AREVA Mines - R&D Department, BAL 0414C-2, Tour AREVA, 1 place Jean Millier, 92084 Paris, La Défense, France
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12
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Kvashnina KO, Kvashnin YO, Vegelius JR, Bosak A, Martin PM, Butorin SM. Sensitivity to Actinide Doping of Uranium Compounds by Resonant Inelastic X-ray Scattering at Uranium L3 Edge. Anal Chem 2015; 87:8772-80. [DOI: 10.1021/acs.analchem.5b01699] [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]
Affiliation(s)
- Kristina O. Kvashnina
- European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP 220, 38043, Grenoble, France
| | - Yaroslav O. Kvashnin
- European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP 220, 38043, Grenoble, France
- Department
of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
| | - Johan R. Vegelius
- Department
of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
| | - Alexei Bosak
- European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP 220, 38043, Grenoble, France
| | | | - Sergei M. Butorin
- Department
of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
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13
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Gupta SK, Dhobale A, Kumar M, Godbole S, Natarajan V. Oxidation state determination of uranium in various uranium oxides: Photoacoustic spectroscopy complimented by photoluminescence studies. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.12.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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14
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Denecke MA. Synchrotron applications to f-element research in the nuclear fuel cycle. Dalton Trans 2015; 44:2606-12. [DOI: 10.1039/c4dt02716g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A summary of innovative techniques using synchrotron radiation for actinide studies in nuclear research, including X-ray spectroscopy and imaging.
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Affiliation(s)
- Melissa A. Denecke
- The University of Manchester
- Dalton Nuclear Institute
- M13 9PL Manchester
- UK
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15
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Vitova T, Green JC, Denning RG, Löble M, Kvashnina K, Kas JJ, Jorissen K, Rehr JJ, Malcherek T, Denecke MA. Polarization dependent high energy resolution X-ray absorption study of dicesium uranyl tetrachloride. Inorg Chem 2014; 54:174-82. [PMID: 25485552 DOI: 10.1021/ic5020016] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Dicesium uranyl tetrachloride (Cs2UO2Cl4) has been a model compound for experimental and theoretical studies of electronic structure of U(VI) in the form of UO2(2+) (uranyl ion) for decades. We have obtained angle-resolved electronic structure information for oriented Cs2UO2Cl4 crystal, specifically relative energies of 5f and 6d valence orbitals probed with extraordinary energy resolution by polarization dependent high energy resolution X-ray absorption near edge structure (PD-HR-XANES) and compare these with predictions from quantum chemical Amsterdam density functional theory (ADF) and ab initio real space multiple-scattering Green's function based FEFF codes. The obtained results have fundamental value but also demonstrate an experimental approach, which offers great potential to benchmark and drive improvement in theoretical calculations of electronic structures of actinide elements.
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Affiliation(s)
- Tonya Vitova
- Karlsruhe Institute of Technology , Institute for Nuclear Waste Disposal, P.O. Box 3640, 76021 Karlsruhe, Germany
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16
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Walshe A, Prüßmann T, Vitova T, Baker RJ. An EXAFS and HR-XANES study of the uranyl peroxides [UO2(η2-O2)(H2O)2]·nH2O (n = 0, 2) and uranyl (oxy)hydroxide [(UO2)4O(OH)6]·6H2O. Dalton Trans 2014; 43:4400-7. [DOI: 10.1039/c3dt52437j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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17
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Ivanova B, Spiteller M. Uranyl-water-containing complexes: solid-state UV-MALDI mass spectrometric and IR spectroscopic approach for selective quantitation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2014; 21:1548-1563. [PMID: 23942998 DOI: 10.1007/s11356-013-1892-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2013] [Accepted: 05/30/2013] [Indexed: 06/02/2023]
Abstract
Since primary environmental concept for long storage of nuclear waste involved assessment of water in uranium complexes depending on migration processes, the paper emphasized solid-state matrix-assisted laser desorption/ionization (MALDI) mass spectrometric (MS) and IR spectroscopic determination of UO2(NO3)2·6H2O; UO2(NO3)2·3H2O, α-, β-, and γ-UO3 modifications; UO3·xH2O (x = 1 or 2); UO3·H2O, described chemically as UO2(OH)2, β- and γ-UO2(OH)2 modifications; and UO4·2H2O, respectively. Advantages and limitation of vibrational spectroscopic approach are discussed, comparing optical spectroscopic data and crystallographic ones. Structural similarities occurred in α-γ modifications of UO3, and UO2(OH)2 compositions are analyzed. Selective speciation achieved by solid-state mass spectrometry is discussed both in terms of its analytical contribution for environmental quality assurance and assessment of radionuclides, and fundamental methodological interest related the mechanistic complex water exchange of UO3·H2O forms in the gas phase. In addition to high selectivity and precision, UV-MALDI-MS, employing an Orbitrap analyzer, was a method that provided fast steps that limited sample pretreatment techniques for direct analysis including imaging. Therefore, random and systematic errors altering metrology and originating from the sample pretreatment stages in the widely implemented analytical protocols for environmental sampling determination of actinides are significantly reduced involving the UV-MALDI-Orbitrap-MS method. The method of quantum chemistry is utilized as well to predict reliably the thermodynamics and nature of U-O bonds in uranium species in gas and condensed phases.
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Affiliation(s)
- Bojidarka Ivanova
- Lehrstuhl für Analytische Chemie, Institut für Umweltforschung, Fakultät für Chemie, Universität Dortmund, Otto-Hahn-Strasse 6, 44227, Dortmund, Nordrhein-Westfalen, Germany,
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Kvashnina KO, Butorin SM, Martin P, Glatzel P. Chemical state of complex uranium oxides. PHYSICAL REVIEW LETTERS 2013; 111:253002. [PMID: 24483742 DOI: 10.1103/physrevlett.111.253002] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Indexed: 05/15/2023]
Abstract
We report here the first direct observation of U(V) in uranium binary oxides and analyze the gradual conversion of the U oxidation state in the mixed uranium systems. Our finding clarifies previous contradicting results and provides important input for the geological disposal of spent fuel, recycling applications, and chemistry of uranium species.
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Affiliation(s)
- K O Kvashnina
- European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP 220, 38043, Grenoble, France
| | - S M Butorin
- Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
| | - P Martin
- CEA, DEN, DEC, CEN Cadarache, 13108, St. Paul lez Durance, France
| | - P Glatzel
- European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP 220, 38043, Grenoble, France
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Othmane G, Allard T, Morin G, Sélo M, Brest J, Llorens I, Chen N, Bargar JR, Fayek M, Calas G. Uranium association with iron-bearing phases in mill tailings from Gunnar, Canada. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:12695-12702. [PMID: 24087982 DOI: 10.1021/es401437y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The speciation of uranium was studied in the mill tailings of the Gunnar uranium mine (Saskatchewan, Canada), which operated in the 1950s and 1960s. The nature, quantification, and spatial distribution of uranium-bearing phases were investigated by chemical and mineralogical analyses, fission track mapping, electron microscopy, and X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectroscopies at the U LIII-edge and Fe K-edge. In addition to uranium-containing phases from the ore, uranium is mostly associated with iron-bearing minerals in all tailing sites. XANES and EXAFS data and transmission electron microscopy analyses of the samples with the highest uranium concentrations (∼400-700 mg kg(-1) of U) demonstrate that uranium primarily occurs as monomeric uranyl ions (UO2(2+)), forming inner-sphere surface complexes bound to ferrihydrite (50-70% of the total U) and to a lesser extent to chlorite (30-40% of the total U). Thus, the stability and mobility of uranium at the Gunnar site are mainly influenced by sorption/desorption processes. In this context, acidic pH or alkaline pH with the presence of UO2(2+)- and/or Fe(3+)-complexing agents (e.g., carbonate) could potentially solubilize U in the tailings pore waters.
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Affiliation(s)
- Guillaume Othmane
- Institut de Minéralogie et de Physique des Milieux Condensés (IMPMC), UMR 7590 CNRS-UPMC/Paris VI-IRD, Case 115 , 4 place Jussieu, 75252 Paris Cedex 05, France
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Sylwester ER, Hudson EA, Allen PG. Surface Interactions of Actinide Ions with Geologic Materials Studied by XAFS. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-590-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTWe have investigated the interaction of the actinyl ion, , with silica, alumina, and montmorillonite surfaces under ambient atmosphere and aqueous conditions using x-ray Absorption Fine Structure (XAFS) Spectroscopy. In acid solution (pH ∼ 3.5), the uranyl ion shows a strong interaction with the silica and alumina surfaces, and a relatively weak association with the montmorillonite surface. The extent of direct surface interaction is determined by comparing structural distortions in the equatorial bonding environment of the uranyl ion relative to the structure of a “free” uranyl aquo complex. Based on this formalism, surface complexation on silica and alumina occurs through an inner-sphere mechanism with surface oxygen atoms binding directly to the equatorial region of the uranyl ion. In contrast, sorption on montmorillonite occurs by an outer sphere mechanism in which the uranyl ion retains the simple aquo complex structure and binds to the surface via ion-exchange. In near-neutral solutions (pH ∼ 6), sorption on all of the materials is dominated by an inner-sphere mechanism. The formation of surface oligomeric species is also observed on silica and alumina.
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Huang CH, Wu PJ, Lee JF, Chen TM. (Ca,Mg,Sr)9Y(PO4)7:Eu2+,Mn2+: Phosphors for white-light near-UV LEDs through crystal field tuning and energy transfer. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11018g] [Citation(s) in RCA: 209] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Fábián M, Proffen T, Ruett U, Veress E, Sváb E. Uranium surroundings in borosilicate glass from neutron and x-ray diffraction and RMC modelling. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:404206. [PMID: 21386567 DOI: 10.1088/0953-8984/22/40/404206] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Neutron and high-energy x-ray diffraction measurements have been performed on multi-component 55SiO(2)·10B(2)O(3)·25Na(2)O·5BaO·ZrO(2) borosilicate host glass loaded with 30 wt% UO(3). Both the traditional Fourier transformation technique and the reverse Monte Carlo simulation of the experimental data have been applied to get structural information. It was established that the basic network structure consists of tetrahedral SiO(4) units and of mixed tetrahedral BO(4) and trigonal BO(3) units, similar to the corresponding host glass. Slight changes have been observed in the oxygen surroundings of the Na and Zr modifier cations; both the Na-O and Zr-O distances decrease and a more compact short-range structure has been obtained compared to the host glass. For the U-O correlations two distinct peaks were resolved at 1.84 and 2.24 Å, and for higher distances intermediate-range correlations were observed. Significant correlations have been revealed between U and the network former Si and B atoms. Uranium ions take part in the network forming, which may be the reason for the observed good glassy stability and hydrolytic properties.
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Affiliation(s)
- M Fábián
- Research Institute for Solid State Physics and Optics, POB 49, H-1525 Budapest, Hungary.
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Schlegel ML, Descostes M. Uranium uptake by hectorite and montmorillonite: a solution chemistry and polarized EXAFS study. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2009; 43:8593-8598. [PMID: 20028057 DOI: 10.1021/es902001k] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The mechanism of U(VI) retention on montmorillonite and hectorite at high ionic strength (0.5 M NaCl) was investigated by solution chemistry and, at near-neutral pH, polarized EXAFS spectroscopy. Uranium(VI) sorption increases from pH 3 to 7 on the two clays, but with a steeper edge for hectorite. Uranium(VI) is no longer retained at pH > 9, presumably owing to the formation of soluble anionic complexes. Polarized EXAFS showed that U(VI) retains its uranyl conformation on montmorillonite (U_mont) and hectorite (U_hect), with uranyl O at 1.79(2) A for U_mont and 1.82(2) A for U_hect, and split equatorial O shells at 2.29(2) and 2.47(2) A (U_mont), or 2.35(2) and 2.53(2) A (U_hect). An additional atomic shell of approximately 0.5 Al/Si at 3.3 A is detected for U_mont, but neither the oxygen nor the cationic shell exhibit clear angular dependence. These results indicate the formation of mononuclear complexes at the edges of montmorillonite platelets, with the orientation of the uranyl axis equal to the magic angle, as constrained by the edges' structural properties. In contrast to U_mont, the U-O signal varies with the polarization angle in U_hect, and the cationic Mg/Si contribution at 3.2 A is weak. The structure of this surface complex is not completely elucidated; it may correspond either to sorption on silanol sites, or to coprecipitation. These results lay out the fundamental molecular-scale basis to understand U retention by neoformed clay layers of nuclear glasses.
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Affiliation(s)
- Michel L Schlegel
- CEA, DEN, DPC/SCP/Laboratory for the Reactivity of Surfaces and Interfaces, F-91191 Gif-sur-Yvette, France.
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Hennig C, Panak PJ, Reich T, Roßberg A, Raff J, Selenska-Pobell S, Matz W, Bucher JJ, Bernhard G, Nitsche H. EXAFS investigation of uranium(VI) complexes formed at Bacillus cereus and Bacillus sphaericus surfaces. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.2001.89.10.625] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Uranium(VI) complex formation at vegetative cells and spores of Bacillus cereus and Bacillus sphaericus was studied using uranium L
II-edge and L
III-edge extended X-ray absorption fine structure (EXAFS) spectroscopy. A comparison of the measured equatorial U-O distances and other EXAFS structural parameters of uranyl species formed at the Bacillus strains with those of the uranyl structure family indicates that the uranium is predominantly bound as uranyl complexes with phosphoryl residues.
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Beesley A, Crespo M, Weiher N, Tsapatsaris N, Cózar J, Esparza H, Méndez C, Hill P, Schroeder S, Montero-Cabrera M. Evolution of chemical species during electrodeposition of uranium for alpha spectrometry by the Hallstadius method. Appl Radiat Isot 2009; 67:1559-69. [DOI: 10.1016/j.apradiso.2009.03.031] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2008] [Accepted: 03/07/2009] [Indexed: 11/27/2022]
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Lozano JM, Clark DL, Conradson SD, Den Auwer C, Fillaux C, Guilaumont D, Webster Keogh D, Mustre de Leon J, Palmer PD, Simoni E. Influence of the local atomic structure in the X-ray absorption near edge spectroscopy of neptunium oxo ions. Phys Chem Chem Phys 2009; 11:10396-402. [DOI: 10.1039/b911731h] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Soldatov A, Lamoen D, Konstantinović M, Van den Berghe S, Scheinost A, Verwerft M. Local structure and oxidation state of uranium in some ternary oxides: X-ray absorption analysis. J SOLID STATE CHEM 2007. [DOI: 10.1016/j.jssc.2006.08.038] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Conradson SD, Abney KD, Begg BD, Brady ED, Clark DL, den Auwer C, Ding M, Dorhout PK, Espinosa-Faller FJ, Gordon PL, Haire RG, Hess NJ, Hess RF, Keogh DW, Lander GH, Lupinetti AJ, Morales LA, Neu MP, Palmer PD, Paviet-Hartmann P, Reilly SD, Runde WH, Tait CD, Veirs DK, Wastin F. Higher order speciation effects on plutonium L(3) X-ray absorption near edge spectra. Inorg Chem 2004; 43:116-31. [PMID: 14704059 DOI: 10.1021/ic0346477] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pu L(3) X-ray near edge absorption spectra for Pu(0-VII) are reported for more than 60 chalcogenides, chlorides, hydrates, hydroxides, nitrates, carbonates, oxy-hydroxides, and other compounds both as solids and in solution, and substituted in zirconolite, perovskite, and borosilicate glass. This large database extends the known correlations between the energy and shape of these spectra from the usual association of the XANES with valence and site symmetry to higher order chemical effects. Because of the large number of compounds of these different types, a number of novel and unexpected behaviors are observed, such as effects resulting from the medium and disorder that can be as large as those from valence.
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Affiliation(s)
- Steven D Conradson
- Materials Science and Technology Division, Seaborg Institute for Transactinum Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
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Den Auwer C, Simoni E, Conradson S, Madic C. Investigating Actinyl Oxo Cations by X‐ray Absorption Spectroscopy. Eur J Inorg Chem 2003. [DOI: 10.1002/ejic.200300093] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Christophe Den Auwer
- CEA Marcoule, DEN/DRCP/Service de Chimie des Procédés et de Séparation, 30207 Bagnols sur Cèze Cédex, France
| | - Eric Simoni
- Institut de Physique Nucléaire Orsay 91405 Orsay Cedex, France
| | - Steven Conradson
- Los Alamos National Laboratory, MST‐8, Los Alamos, NM 87545, USA
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Kudin KN, Scuseria GE, Martin RL. Hybrid density-functional theory and the insulating gap of UO2. PHYSICAL REVIEW LETTERS 2002; 89:266402. [PMID: 12484842 DOI: 10.1103/physrevlett.89.266402] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2002] [Indexed: 05/20/2023]
Abstract
We report the first calculations carried out with a periodic boundary condition code capable of examining hybrid density-functional theory (DFT) for f-element solids. We apply it to the electronic structure of the traditional Mott insulator UO2, and find that it correctly yields an antiferromagnetic insulator as opposed to the ferromagnetic metal predicted by the local spin density and generalized gradient approximations. The gap, density of states, and optimum lattice constant are all in good agreement with experiment. We stress that this results from the functional and the variational principle alone. We compare our results with the more traditional approximations.
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Affiliation(s)
- Konstantin N Kudin
- Department of Chemistry, Rice University, Houston, Texas 77005-1892, USA
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Liu Y, Ogata CM, Hendrickson WA. Multiwavelength anomalous diffraction analysis at the M absorption edges of uranium. Proc Natl Acad Sci U S A 2001; 98:10648-53. [PMID: 11526210 PMCID: PMC58520 DOI: 10.1073/pnas.191003998] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/03/2001] [Indexed: 11/18/2022] Open
Abstract
The multiwavelength anomalous diffraction (MAD) method for phase evaluation is now widely used in macromolecular crystallography. Successful MAD structure determinations have been carried out at the K or L absorption edges of a variety of elements. In this study, we investigate the anomalous scattering properties of uranium at its M(IV) (3.326 A) and M(V) (3.490 A) edge. Fluorescence spectra showed remarkably strong anomalous scattering at these edges (f' = -70e, f" = 80e at the M(IV) edge and f' = -90e, f" = 105e at the M(V) edge), many times higher than from any anomalous scatterers used previously for MAD phasing. However, the large scattering angles and high absorption at the low energies of these edges present some difficulties not found in typical crystallographic studies. We conducted test experiments at the M(IV) edge with crystals of porcine elastase derivatized with uranyl nitrate. A four-wavelength MAD data set complete to 3.2-A Bragg spacings was collected from a single small frozen crystal. Analysis of the data yielded satisfactory phase information (average difference of (0)phi(T) - (0)phi(A) for replicated determinations is 32 degrees ) and produced an interpretable electron-density map. Our results demonstrate that it is practical to measure macromolecular diffraction data at these edges with current instrumentation and that phase information of good accuracy can be extracted from such experiments. We show that such experiments have potential for the phasing of very large macromolecular assemblages.
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Affiliation(s)
- Y Liu
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA
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Den Auwer C, Simoni É, Conradson SD, Mustre de Leon J, Moisy P, Béres A. X-ray absorption LIII and MV edges of hexavalent lower actinides. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1387-1609(00)01150-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Allen PG, Bucher JJ, Shuh DK, Edelstein NM, Reich T. Investigation of Aquo and Chloro Complexes of UO(2)(2+), NpO(2)(+), Np(4+), and Pu(3+) by X-ray Absorption Fine Structure Spectroscopy. Inorg Chem 1997; 36:4676-4683. [PMID: 11670143 DOI: 10.1021/ic970502m] [Citation(s) in RCA: 255] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
U, Np, and Pu L(II,III)-edge X-ray absorption fine structure (XAFS) spectra were collected for the UO(2)(2+), NpO(2)(+), Np(4+), and Pu(3+) ions as a function of chloride concentration in aqueous solution. At low chloride concentration, the hydration numbers and corresponding bond lengths for the different ions are as follows: UO(2)(2+), N= 5.3, R = 2.41 Å; NpO(2)(+), N = 5.0, R = 2.50 Å; Np(4+), N = 11.2, R = 2.40 Å; Pu(3+), N = 10.2, R = 2.51 Å. As the Cl(-) concentration increases, inner-sphere Cl(-) complexation occurs, resulting in a decrease in the hydration numbers and an expansion of the actinide-oxygen (water) bond lengths. The Pu(3+) ion shows only a decrease in hydration number (40%) and no inner-sphere Cl(-) complexation for [Cl(-)] < 14 M. For concentrations up to 10-14 M Cl(-), the average Cl(-) coordination numbers and bond lengths are as follows: UO(2)(2+), N = 2.6, R = 2.73 Å; NpO(2)(+), N = 1.0, R = 2.84 Å; Np(4+), N = 2.0, R = 2.61 Å. Structural changes are observed in the near-edge spectral region as shown by significant changes in the white line intensities upon Cl(-) complexation. For ions with similar structures, i.e. Pu(3+) and Np(4+) or the actinyl ions NpO(2)(+) and UO(2)(2+), positive energy shifts are observed with increasing oxidation state. The ability to use XAFS speciation results to calculate equilibrium constants and the relationship of these results to previous studies are discussed.
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Affiliation(s)
- P. G. Allen
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Institute für Radiochemie, Forschungszentrum Rossendorf e. V., Postfach 51 01 19, D-01314 Dresden, Germany
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Hudson EA, Allen PG, Terminello LJ, Denecke MA, Reich T. Polarized x-ray-absorption spectroscopy of the uranyl ion: Comparison of experiment and theory. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:156-165. [PMID: 9984242 DOI: 10.1103/physrevb.54.156] [Citation(s) in RCA: 136] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Hudson EA, Rehr JJ, Bucher JJ. Multiple-scattering calculations of the uranium L3-edge x-ray-absorption near-edge structure. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:13815-13826. [PMID: 9980598 DOI: 10.1103/physrevb.52.13815] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Bertram S, Kaindl G, Jové J, Pagès M, Gal J. Electronic structure of actinide compounds from LIII-edge x-ray absorption. PHYSICAL REVIEW LETTERS 1989; 63:2680-2683. [PMID: 10040959 DOI: 10.1103/physrevlett.63.2680] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Herbst JF, Wilkins JW. Relativistic calculations of 2p and 3d excitation energies in the actinide metals. PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 38:1027-1039. [PMID: 9946355 DOI: 10.1103/physrevb.38.1027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Itié J, Benedict U, Dabos S, Dartyge E, Fontaine A, Tourillon G, Olsen J. High pressure X-ray absorption spectroscopy on uranium compounds. Inorganica Chim Acta 1987. [DOI: 10.1016/s0020-1693(00)81086-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Kalkowski G, Kaindl G, Brewer WD, Krone W. Near-edge x-ray-absorption fine structure in uranium compounds. PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 35:2667-2677. [PMID: 9941740 DOI: 10.1103/physrevb.35.2667] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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