Article
Chemistry, Multidisciplinary
Jean-Francois Vigier, Daniel Freis, Olaf Walter, Oliver Dieste Blanco, Daniel Bouexiere, Evelyn Zuleger, Natalia Palina, Tonya Vitova, Rudy J. M. Konings, Karin Popa
Summary: This study demonstrates the successful production of homogeneous nanocrystalline particles of mixed actinide oxide solid solutions containing americium. The nanocrystals were characterized and studied for their structure and behavior under self-irradiation. The results showed that the as-synthesized nanoparticles had smaller crystallographic swelling compared to the sintered products.
Article
Chemistry, Inorganic & Nuclear
Christelle Tamain, Matthieu Autillo, Dominique Guillaumont, Laetitia Guerin, Richard E. Wilson, Claude Berthon
Summary: This study reports the structures and spectra of new isomorphous molecular An(IV)-oxalate compounds. The compounds contain nonbridging oxalate ligands in the first coordination sphere, which is uncommon for An(IV)-oxalate systems. The bonding analysis shows that the actinide-oxygen bond is predominantly ionic with a slight increase in covalency from Th to U.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Sara B. Isbill, Elodia Ciprian, Jonathan H. Christian, Amy Hixon, Bryan J. Foley, Eliel Villa-Aleman, Andrew J. Miskowiec
Summary: The structure of anhydrous Pu(C2O4)2 is still not completely understood, but recent studies using density functional theory (DFT) and experimental results have provided insight into its lattice dynamics. Differences in vibrational modes between candidate structures were identified, with one structure showing a distinctive mode at around 1380 cm-1. The agreement between the calculated frequency and optical activity of this mode and experimental results strongly supports this structure as that of anhydrous Pu(C2O4)2.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Brian M. Rotermund, Joseph M. Sperling, Gregory P. Horne, Nicholas B. Beck, Hannah B. Wineinger, Zhuanling Bai, Cristian Celis-Barros, Daniela Gomez Martinez, Thomas E. Albrecht-Schonzart
Summary: Crystals of plutonium tetramethyl diglycolamide complexes were synthesized and characterized. Geometry calculations revealed changes in point group symmetry between Pu3+ and Pu4+ structures despite no change in coordination environment. These structures provide insight into the potential chemical and structural differences of tetravalent curium in used nuclear fuel reprocessing streams.
INORGANIC CHEMISTRY
(2023)
Article
Engineering, Chemical
Donatien Gomes Rodrigues, Sophie Monge, Nicolas Dacheux, Stephane Pellet-Rostaing, Catherine Faur
Summary: The investigation in this work focused on the thermosensitive behavior of P(CPAAm6C) and the selective sorption properties towards Th/U/Gd mixtures, revealing different sorption characteristics for different ions between the two polymers. The results from thermosensitive behavior and sorption experiments of the two polymers demonstrate their significance in hydrometallurgical treatments of rare earth ores.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Justin C. Wedal, Nathalia Cajiao, Michael L. Neidig, William J. Evans
Summary: A new synthesis of Th(ii) complexes has been discovered, which involves the addition of simple MX salts to Cp'' Th-3(III) in the presence of 18-crown-6 or 2.2.2-cryptand. This synthesis method is applicable to MX salts where M is Li, Na, K and X is H, Cl, Me, N-3.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Analytical
Daniel Glueckman, Francesca Quinto, Karin Hain, Claudia Joseph, Vanessa Montoya, Peter Steier, Horst Geckeis
Summary: The geochemistry of actinides under reducing conditions in a deep geological nuclear waste repository is characterized by low solubility and strong sorption to mineral surfaces. This study used accelerator mass spectrometry as an analytical method to quantify actinide migration at ultra-trace levels and to determine diffusion profiles of multiple actinides simultaneously. The results showed a decrease in count rates for high-matrix clay rock samples compared to low-matrix standard solutions, indicating a reduction in the sputter rate of actinide nuclides in the AMS ion source.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2022)
Article
Chemistry, Analytical
Michael R. Savina, Brett H. Isselhardt, Reto Trappitsch
Summary: The study analyzed spent nuclear fuel samples for actinide isotopic composition using resonance ionization mass spectrometry, finding differences in actinide concentrations and isotope distributions between the core and near-edge regions of fuel pellets due to the skin effect caused by variations in neutron energy spectra. The ability to estimate the enhancement in Pu concentration at the rim of the pellet was demonstrated by measuring the Pu-238/Pu-239 ratio in the presence of a 7400x excess of U-238.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Rajib Karmakar, Pritam Singh, Kamalika Sen
Summary: In this study, mesoporous alumina was utilized as an adsorbent for the selective adsorption and separation of Th(IV), showing high adsorption capacities at different temperatures. Desorption of the adsorbed thorium was achieved by treatment with trisodium citrate.
SEPARATION SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Physical
V. N. Serezhkin, M. Albakajaji, L. B. Serezhkina
Summary: The research focuses on the VD polyhedra of An and Te atoms in compounds, showing the coordination of An(III), An(IV), and U(V) atoms with 6 to 9 tellurium atoms. It discusses the use of crystal structure data to estimate Te-Te bonds and tellurium atom charges, as well as the characteristics of homoatomic structural moieties. The formal charge of tellurium atoms in linear chains is determined by the proportion of Te^- and Te^2- ions statistically arranged along the chain axis.
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Chemistry, Inorganic & Nuclear
Kang Liu, Xiao-Wang Chi, Yan Guo, Qun-Yan Wu, Kong-Qiu Hu, Lei Mei, Zhi-Fang Chai, Ji-Pan Yu, Wei-Qun Shi
Summary: This study describes the synthesis and characterization of U, Th, and Ti phosphaethynolate complexes featuring a preferential O-coordination fashion. The structural similarity of this series of complexes allows comparison of the bonding properties of d- and f-block elements. Density functional theory calculations show a consistent covalency trend of U-O > Th-O > Ti-O in the phosphathynolate complexes.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Fenglei Liu, ZhengFeng Hu, Miao Xiang, Baowei Hu
Summary: In this study, Fe3O4 nanoparticles were incorporated into amidoxime-functionalized Ti3C2 to form a novel magnetic MXenes composite (Fe3O4@Ti3C2-PDA/OA) for the removal of radionuclides from simulated radioactive wastewater. The adsorption performance of the composite was investigated under different conditions, and the results showed that Fe3O4@Ti3C2-PDA/OA had much higher adsorption capacity for U(VI) and Th(IV) compared to traditional adsorption materials. The mechanism of adsorption was found to be through complexation of hydroxyls and amidoxime groups on the surface of the composite with U(VI) and Th(IV). This study demonstrates the potential of MXenes-based composites in the remediation of radioactive ions.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Yangxin Chen, Zhangxian Chen, Yang Zhou, Yanqiang Li, Youchao Liu, Qingran Ding, Xin Chen, Sangen Zhao, Junhua Luo
Summary: In this work, the first antimony(III) fluoride oxalate birefringent material, KSb2C2O4F5, was designed and synthesized. Despite suboptimal arrangement of [C2O4](2-) groups in the crystal structure, KSb2C2O4F5 exhibited large birefringence, even outperforming the well-known commercial birefringent material alpha-BaB2O4. The prominent birefringence was attributed to the alliance of planar pi-conjugated [C2O4](2-) anions, highly distorted SbO2F2 and SbOF3 polyhedra with a stereochemically active lone pair, showing potential for high-performance birefringent materials development.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Green & Sustainable Science & Technology
Jianzhang Gao, Jiaqi Chen, Huitao Lv, Xingan Feng, Shitao Liao, Yongde Yan, Yun Xue, Fuqiu Ma
Summary: In this paper, a new process combining electrolysis and leaching is proposed to achieve resource regeneration of uranium and thorium from radioactive wastewater. The results showed that carbonate was the optimal separation system for uranium-thorium separation, with a maximum separation efficiency of 4.8 x 104 at pH 10.5. The study also demonstrated effective electrochemical recovery of uranium and selective leaching of thorium, leading to a roughly tripled purity of the final product. This study provides an effective strategy for reducing waste and achieving the recycling of non-renewable uranium-thorium resources.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Analytical
Prajakta S. More, Umesh B. Barache, Shashikant H. Gaikwad, Laxman Gavali
Summary: The liquid-liquid extraction of Th(IV) and U(VI) with 4-methyl-N-n-octylaniline as an extracting agent was detailed in this study. Optimum conditions for the distribution of Th(IV) and U(VI) in xylene were determined, along with the effects of acidity and extracting agent concentration on the metal extraction. The recovery percentages were high, indicating the accuracy of the method.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
C. Tamain, B. Arab-Chapelet, M. Rivenet, X. F. Legoff, G. Loubert, S. Grandjean, F. Abraham
INORGANIC CHEMISTRY
(2016)
Article
Chemistry, Inorganic & Nuclear
Gael Loubert, Christophe Volkringer, Natacha Henry, Benedicte Arab-Chapelet, Thibaud Delahaye, Thierry Loiseau
Article
Chemistry, Physical
Angel Caravaca, Sebastien Picart, Mimoun Aouine, Benedicte Arab-Chapelet, Philippe Vernoux, Thibaud Delahaye
Article
Chemistry, Multidisciplinary
Florent Blanchard, Murielle Rivenet, Nicolas Vigier, Isabelle Hablot, Stephane Grandjean, Francis Abraham
CRYSTAL GROWTH & DESIGN
(2018)
Article
Metallurgy & Metallurgical Engineering
Yannis Ziouane, Thomas Milhau, Marie Maubert, Benedicte Arab-Chapelet, Gilles Leturcq
Article
Chemistry, Inorganic & Nuclear
Pierre Farger, Blaise Haidon, Pascal Roussel, Benedicte Arab-Chapelet, Murielle Rivenet
INORGANIC CHEMISTRY
(2019)
Article
Materials Science, Ceramics
Severin Chaigne, Gaelle Boeuf-Muraille, Remy Boulesteix, Alexandre Maitre, Benedicte Arab-Chapelet, Thibaud Delahaye
CERAMICS INTERNATIONAL
(2019)
Article
Chemistry, Analytical
Steve Jan, Pierre Sarrat, Fabrice Bouchet, Eric Cantrel, Benedicte Arab-Chapelet, Cedric Rivier
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2019)
Article
Chemistry, Inorganic & Nuclear
Gael Loubert, Natacha Henry, Christophe Volkringer, Sylvain Duval, Christelle Tamain, Benedicte Arab-Chapelet, Thibaud Delahaye, Thierry Loiseau
INORGANIC CHEMISTRY
(2020)
Article
Metallurgy & Metallurgical Engineering
Yannis Ziouane, Benedicte Arab-Chapelet, Gilles Leturcq
Article
Chemistry, Inorganic & Nuclear
Nicolas Hibert, Benedicte Arab-Chapelet, Murielle Rivenet, Laurent Venault, Christelle Tamain, Olivier Tougait
Summary: This study investigated the coprecipitation behavior of U-Th and U-Pu actinide peroxide mixed systems, and found that this chemical coprecipitation route has potential attractiveness in MOx fuel fabrication.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Anne-Lise Vitart, Blaise Haidon, Benedicte Arab-Chapele, Murielle Rivenet, Isabelle Bisel, Patrick Pochon, Pascal Roussel, Stephane Grandjean, Francis Abraham
CRYSTAL GROWTH & DESIGN
(2017)
Proceedings Paper
Chemistry, Inorganic & Nuclear
Christophe Poinssot, Stephane Bourg, Stephane Grandjean, Bernard Boullis
ATALANTE 2016 INTERNATIONAL CONFERENCE ON NUCLEAR CHEMISTRY FOR SUSTAINABLE FUEL CYCLES
(2016)
Article
Materials Science, Multidisciplinary
S. Bertolotto, S. Szenknect, S. Lalleman, R. Podor, L. Claparede, A. Magnaldo, P. Raison, A. Mesbah, B. Arab-Chapelet, N. Dacheux
Article
Materials Science, Multidisciplinary
Liuming Wei, Jingwen Li, Yonggang Li, Qirong Zheng, Fan Cheng, Chuanguo Zhang, Jingyu Li, Gaofeng Zhao, Zhi Zeng
Summary: This study investigates the influence of He-V complexes on H behaviors on different W surfaces using DFT calculations. The results show that H dissolution is most difficult but H trapping is easiest on the W (110) surface, while the opposite is true on the W (111) surface. Moreover, the presence of He-V complexes increases the difficulty of H diffusion from bulk to surface and desorption.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Yan Meng, Song Zeng, Chen Chen, Chaowen Zhu, Huahai Shen, Xiaosong Zhou, Xiaochun Han
Summary: The characteristics of magnetron sputtered Cr coatings vary with different temperature, bias voltage, and pressure. Coatings with random orientation, good crystallinity, and small grain size exhibit favorable oxidation behavior, while coatings with strong (200) texture, poor crystallinity, and large grains have many intrinsic defects that are detrimental to the protection property of the Cr coatings.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Xinyuan Xu, Zefeng Yu, Wei-Ying Chen, Aiping Chen, Arthur Motta, Xing Wang
Summary: This study presents an automated approach for characterizing grain morphology in TEM images recorded during ion irradiation. By combining a machine learning model and a computer vision algorithm, comparable results to human analysis can be achieved with significantly reduced analysis time. Researchers can train their own models following the procedures described in this study to automate grain morphology analysis of their own TEM images.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Shihao Wu, Dong Wang, Yapei Zhang, Koji Okamoto, Marco Pellegrini, Wenxi Tian, Suizheng Qiu, G. H. Su
Summary: The oxidation and degradation mechanisms of Cr coating on Zr alloy cladding under high temperature steam atmosphere are summarized, and a mathematical analysis model is established to predict the changes in coating thickness. The model is applied in the analysis of structure evolution under different conditions.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
V. Diaz-Mena, J. de Prado, M. Roldan, I. Izaguirre, M. Sanchez, M. Rieth, A. Urena
Summary: The brazeability of a cupronickel alloy was evaluated as a filler alloy for high-temperature joining of tungsten to steel. The study investigated the brazing conditions and the impact of the selected filler on the joint quality using numerical software. The results showed different metallurgical interactions and diffusion phenomena between the filler alloy and the base materials at different temperatures. The study emphasized the importance of selecting a suitable filler to mitigate residual stresses in the joints.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Pengcheng Zhu, Yajie Zhao, Yan-Ru Lin, Jean Henry, Steven J. Zinkle
Summary: This study investigates the effect of heavy-ion irradiation on radiation hardening in high-purity binary alloy Fe18Cr. Nanoindentation testing and high-quality TEM imaging were conducted to extract hardness and microstructure information. The strength factor was accurately calculated based on the detailed TEM characterization of irradiated microstructures, and a refined hardening superposition method was applied to quantify the mechanical properties of ion-irradiated materials.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bin Wu, Haixia Ning, Hanzhen Zhu, Jianjun Chen, Kang Wang, Daiyu Zhang, Fu Wang, Qilong Liao
Summary: This study discusses the effects of ZrO2 and B2O3 on the phase composition and properties of SAP-based glass-ceramics. The results show that ZrO2 addition improves the formation of NZP phase while restricting the crystallization of AlPO4 phases. The correct ratios of ZrO2 and B2O3 allow only the formation of NZP phase within the SAP glass.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Hwasung Yeom, Greg Johnson, Benjamin Maier, Tyler Dabney, Kumar Sridharan
Summary: Cr-Nb bilayer coatings were developed using cold spray deposition to improve the limiting operational temperature of Cr-coated Zr-alloy system. The coatings exhibited outstanding oxidation resistance at high temperatures and formed continuous intermetallic compound layers at the interfaces.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Padhraic L. Mulligan, Andrew T. Nelson, Chad M. Parish, Patrick A. Champlin, Xiang Chen, Daniel Morrall, Jason M. Harp
Summary: Environmental barrier coatings are being developed to reduce oxidation and embrittlement in Zr-based materials. Chromium nitride is a candidate for this application, but understanding its impact on irradiation-induced creep and microstructure is critical.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Dexuan Yan, Xinlei Cao, Ke Shen
Summary: This study investigated the purification mechanism of polycrystalline graphite by comparing IG-11 graphite with IG-110 nuclear grade graphite. The analysis revealed that metallic impurities in IG-11 were primarily segregated within graphite porosities, while IG-110 demonstrated a significant reduction in impurities. This research contributes to the development of innovative graphite purification techniques for greater purity and stronger oxidation resistance.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Wei Xu, Wei Peng, Lei Shi, Qi Sun
Summary: This paper investigates the oxidation and shape evolution of matrix graphite in high temperature gas-cooled reactors during air-ingress accidents. A reaction kinetics model is established and computational fluid dynamics with a dynamic mesh method is used to simulate the oxidation process. The results show that the geometric shape of graphite changes significantly with increasing flow rate, and the graphite pebbles tend to form a structure with a narrow front and wide tail.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Allison Harward, Casey Elliott, Michael Shaltry, Krista Carlson, Tae-Sic Yoo, Guy Fredrickson, Michael Patterson, Michael F. Simpson
Summary: This paper investigates the hygroscopic properties of eutectic LiCl-KCl absorbed into zeolite-4A. The study finds that water absorption and corrosion worsen with increasing salt loading. It also suggests that the salt can be stored in a non-inert atmosphere for a certain period of time.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Takaaki Koyanagi, Xunxiang Hu, Christian M. Petrie, Gyanender Singh, Caen Ang, Christian P. Deck, Weon-Ju Kim, Daejong Kim, James Braun, Yutai Katoh
Summary: This study provides critical experimental data on the effects of irradiation on the hermeticity of SiC composite cladding, finding that irradiation can cause a decrease in hermeticity and cracking, and coating the outer surface can mitigate the cracking issue.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
S. Krat, A. Prishvitsyn, Yu. Gasparyan
Summary: This study proposes a probabilistic and diffusion-based model to describe the co-deposition of multiple hydrogen isotopes with slowly grown metal layers. The model calculates the relative concentrations of different hydrogen isotopes in the co-deposited metal layers. It is found that if hydrogen isotopes have different detrapping energies, only the isotope with the highest detrapping energy shows a monotonic decrease in concentration with deposition temperature. Furthermore, the study evaluates the uncertainty of tritium concentration in the co-deposited layer based on the uncertainty in detrapping energy of tritium and deuterium, predicting a >10% tritium concentration uncertainty for a 0.01 eV difference.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Tijo Vazhappilly, Arup Kumar Pathak
Summary: This study investigates the effect of Ce atom substitution in UO2 on its thermophysical properties using density functional theory. The results show that the Ce substitution levels and the oxidation state of Ce/U atoms strongly influence the band structure and specific heat capacity of the UO2 lattice. These findings provide important insights into the fuel properties of UO2 under reactor conditions.
JOURNAL OF NUCLEAR MATERIALS
(2024)