Searched for: author:"Konings, R.J.M."
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Smith, A.L. (author), Capelli, E. (author), Konings, R.J.M. (author), Gheribi, A. E. (author)
The (Li,Be)F<sub>x</sub> fluoride salt is an ionic liquid with complex non-ideal thermodynamic behaviour due to the formation of short-range order. In this work, we explore the relationship between local structure, thermo-physical and thermodynamic properties in this system using a multidisciplinary approach that couples molecular dynamics...
journal article 2020
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Epifano, E. (author), Prieur, D. (author), Martin, P. M. (author), Guéneau, C. (author), Dardenne, K. (author), Rothe, J. (author), Vitova, T. (author), Dieste, O. (author), Konings, R.J.M. (author)
In the context of a comprehensive campaign for the characterisation of transmutation fuels for next generation nuclear reactors, the melting behaviour of mixed uranium-americium dioxides has been experimentally studied for the first time by laser heating, for Am concentrations up to 70 mol. % under different types of atmospheres. Extensive...
journal article 2020
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Smith, A.L. (author), Kauric, G.P.T.F. (author), van Eijck, L. (author), Goubitz, K. (author), Clavier, N. (author), Wallez, G. (author), Konings, R.J.M. (author)
Neutron diffraction measurements of the double molybdate Cs<sub>3</sub>Na(MoO<sub>4</sub>)<sub>2</sub> have been performed for the first time in this work and the crystal structure refined using the Rietveld method. The thermal expansion of this trigonal phase, in space group P3¯m1, measured using high temperature X-ray diffraction (XRD),...
journal article 2019
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Tosolin, A. (author), Colle, J. Y. (author), Mastromarino, S. (author), Souček, P. (author), Luzzi, L. (author), Konings, R.J.M. (author), Beneš, O. (author)
The mixture LiF-ThF<sub>4</sub>-UF<sub>4</sub>-PuF<sub>3</sub> (77.5–6.6-12.3–3.6 mol%), a fuel option for the Molten Salt Fast Reactor (MSFR), has been measured by differential scanning calorimetry (DSC) for determination of phase transitions, and by Knudsen effusion mass spectrometry (KEMS) for measurement of partial vapour pressures. The...
journal article 2019
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Valu, S.O. (author), De Bona, Emanuele (author), Popa, Karin (author), Griveau, Jean Christophe (author), Colineau, Eric (author), Konings, R.J.M. (author)
The low-temperature heat capacity of (U<sub>1−y</sub>Th<sub>y</sub>)O<sub>2</sub> and <sup>238</sup>Pu-doped UO<sub>2</sub> samples were determined using hybrid adiabatic relaxation calorimetry. Results of the investigated systems revealed the presence of the magnetic transition specific for UO<sub>2</sub> in all three intermediate...
journal article 2019
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Epifano, E. (author), Naji, M. (author), Manara, D. (author), Scheinost, A. C. (author), Hennig, C. (author), Lechelle, J. (author), Konings, R.J.M. (author), Rothe, J. (author), Martin, P. M. (author)
To assure the safety of oxide-fuel based nuclear reactors, the knowledge of the atomic-scale properties of U<sub>1−y</sub>M<sub>y</sub>O<sub>2±x</sub> materials is essential. These compounds show complex chemical properties, originating from the fact that actinides and rare earths may occur with different oxidation states. In these mostly...
journal article 2019
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Ocadiz Flores, J.A. (author), Capelli, E. (author), Raison, P. E. (author), Konings, R.J.M. (author), Smith, A.L. (author)
Using the modified quasi-chemical model in the quadruplet approximation, three new thermodynamic assessments of binary systems useful for the detailed operational design of the Molten Salt Reactor are presented: AF-NiF<sub>2</sub> (A = Li, Na, K). These systems are particularly relevant for the study of the molten salt-structural materials...
journal article 2018
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Capelli, E. (author), Konings, R.J.M. (author)
The complete thermodynamic description of the niobium-fluorine system is presented for the first time in this work. It results from a critical evaluation of the available experimental data and new thermodynamic calculations. In total, three niobium fluoride solid phases (NbF<sub>3</sub>, NbF<sub>4</sub> and NbF<sub>5</sub>) and seven gaseous...
journal article 2018
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Capelli, E. (author), Beneš, O. (author), Konings, R.J.M. (author)
The present study describes the full thermodynamic assessment of the Li,Cs,Th//F,I system. The existing database for the relevant fluoride salts considered as fuel for the Molten Salt Reactor (MSR) has been extended with two key fission products, cesium and iodine. A complete evaluation of all the common-ion binary and ternary sub-systems of...
journal article 2018
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Smith, A.L. (author), Pignié, M.C.F.C.O. (author), van Eijck, L. (author), Griveau, Jean Christophe (author), Colineau, Eric (author), Konings, R.J.M. (author)
The enthalpy of formation at 298.15 K and low temperature heat capacity of Cs3Na(MoO4)2 have been measured for the first time in this work using solution calorimetry and thermal-relaxation calorimetry in the temperature range T = (1.9–299.6) K, respectively. The solution calorimetry measurements, performed in 2 M HNO3 solution, have yielded an...
journal article 2018
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Manara, Dario (author), Soldi, Luca (author), Mastromarino, S. (author), Boboridis, Kostantinos (author), Robba, Davide (author), Vlahovic, Luka (author), Konings, R.J.M. (author)
Major and severe accidents have occurred three times in nuclear power plants (NPPs), at Three Mile Island (USA, 1979), Chernobyl (former USSR, 1986) and Fukushima (Japan, 2011). Research on the causes, dynamics, and consequences of these mishaps has been performed in a few laboratories worldwide in the last three decades. Common goals of such...
journal article 2017
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Smith, A.L. (author), Guéneau, C (author), Flèche, J. L. (author), Chatain, S. (author), Beneš, O. (author), Konings, R.J.M. (author)
A thermodynamic model for the Na-O system was developed for the first time using the CALPHAD method after review of the structural, thermodynamic, and phase diagram data available on this system. Differential Scanning Calorimetry measurements were moreover performed to assess the phase equilibria and liquidus temperature in the Na<sub>2</sub...
journal article 2017
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Bykov, D. (author), Konings, R.J.M. (author), Apostolidis, C. (author), Hen, A. (author), Colineau, E (author), Wiss, T (author), Raison, P. (author)
A new double neptunium zirconium phosphate of the type MxZr2(PO4)3 (M = Np), crystallizing in the structure type NaZr2(PO4)3 (NZP, NASICON), was synthesized by solid state reactions at high temperatures and characterized by X-ray diffraction, infrared spectroscopy and Mössbauer spectroscopy. The Rietveld refinement of the XRD pattern together...
journal article 2017
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van Maris, V. R. (author), Naji, M. (author), Di Lemma, F.G. (author), Colle, J-Y (author), Bykov, D. (author), Konings, R.J.M. (author)
During rapid high-temperature events, like a terrorist attack with radiological dispersal device, radiological material will be released into the environment. In these scenarios, the ratio between parent and daughter nuclides can be used for nuclear forensic investigations to determine the age of the used radioactive source. We have used fast...
journal article 2017
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Cakir, P. (author), Eloirdi, R (author), Huber, F. (author), Konings, R.J.M. (author), Gouder, T (author)
Thin films of U<sub>1− x</sub>Th<sub>x</sub>O<sub>2</sub> (x = 0 to 1) have been deposited via reactive DC sputter technique and characterized by X-ray/Ultra-violet Photoelectron Spectroscopy (XPS/UPS), X-ray Powder Diffractometer (XRD) and Cyclic Voltammetry (CV) in order to understand the effect of Thorium on the oxidation mechanism. During...
journal article 2017
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Di Lemma, Fidelma Giulia (author), Colle, Jean Yves (author), Ernstberger, Markus (author), Konings, R.J.M. (author)
Experimental tests have been performed to characterize the aerosols representative of radiological dispersion devices (RDDs, a.k.a. "dirty bombs") by applying to chosen surrogate compound rapid high temperature transients, vaporizing the sample and forming aerosols mainly by rapid cooling of the vapour. The materials, which were tested in...
journal article 2016
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Krajkó, Judit (author), Varga, Zsolt (author), Wallenius, Maria (author), Mayer, Klaus (author), Konings, R.J.M. (author)
The applicability and limitations of sulphur isotope ratio as a nuclear forensic signature have been studied. The typically applied leaching methods in uranium mining processes were simulated for five uranium ore samples and the n(<sup>34</sup>S)/n(<sup>32</sup>S) ratios were measured. The sulphur isotope ratio variation during uranium ore...
journal article 2016
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Smith, A.L. (author), Hen, Amir (author), Magnani, Nicola (author), Sanchez, Jean Pierre (author), Colineau, Eric (author), Griveau, Jean Christophe (author), Raison, Philippe E. (author), Caciuffo, Roberto (author), Konings, R.J.M. (author), Cheetham, Anthony K. (author)
The physical and chemical properties at low temperatures of hexavalent disodium neptunate α-Na<sub>2</sub>NpO<sub>4</sub> are investigated for the first time in this work using Mössbauer spectroscopy, magnetization, magnetic susceptibility, and heat capacity measurements. The Np(VI) valence state is confirmed by the isomer shift value of the...
journal article 2016
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Smith, A.L. (author), Colle, J-Y (author), Benes, O (author), Konings, R.J.M. (author), Sundman, B (author), Guéneau, C (author)
journal article 2016
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Smith, A.L. (author), Martin, Philippe M. (author), Prieur, Damien (author), Scheinost, Andreas C. (author), Raison, Philippe E. (author), Cheetham, Anthony K. (author), Konings, R.J.M. (author)
The charge distributions in α-Na<sub>2</sub>UO<sub>4</sub>, Na<sub>3</sub>NpO<sub>4</sub>, α-Na<sub>2</sub>NpO<sub>4</sub>, Na<sub>4</sub>NpO<sub>5</sub>, Na<sub>5</sub>NpO<sub>6</sub>, Na<sub>2</sub>PuO<sub>3</sub>, Na<sub>4</sub>PuO<sub>5</sub>, and Na<sub>5</sub>PuO<sub>6</sub> are investigated in this work using X-ray absorption near-edge...
journal article 2016
Searched for: author:"Konings, R.J.M."
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