356 results found
Kuganathan N, Arya AK, Rushton MJD, et al., 2018, Trapping of volatile fission products by C<inf>60</inf>, Carbon, Vol: 132, Pages: 477-485, ISSN: 0008-6223
© 2018 The Authors Carbon based filters provide important safety barriers that remove volatile fission products from gas streams. The capacity and efficiency of a filter to trap fission products depends upon the strength of the interaction between the fission products and the filter material. In this study, we apply density functional theory together with a dispersion correction (DFT + D) to predict structures and energies of volatile fission product atoms and molecules trapped by buckminsterfullerene (C 60 ). Endohedral encapsulation energies and exohedral association energies show that Rb and Cs are strongly trapped as ions, each transferring approximately one electron to C 60 . Kr and Xe are weakly trapped atoms with Xe showing a preference for exohedral association and Kr for endohedral encapsulation. Br, I and Te, while strongly trapped from atoms (and assuming charge from C 60 ) are thermodynamically more stable as neutral covalently bonded Br 2 , I 2 and Te 2 molecules weakly trapped through van der Waals forces, exohedrally. Heteronuclear CsBr and CsI were also considered. Both molecules were non-bonded to C 60 with similar association energies to those exhibited by Br 2 , I 2 and Te 2 .
Middleburgh SC, Claisse A, Andersson DA, et al., 2018, Solution of hydrogen in accident tolerant fuel candidate material: U₃Si₂, Journal of Nuclear Materials, Vol: 501, Pages: 234-237, ISSN: 0022-3115
Hydrogen uptake and accommodation into U 3 Si 2 , a candidate accident-tolerant fuel system, has been modelled on the atomic scale using the density functional theory. The solution energy of multiple H atoms is computed, reaching a stoichiometry of U 3 Si 2 H 2 which has been experimentally observed in previous work (reported as U 3 Si 2 H 1.8 ). The absorption of hydrogen is found to be favourable up to U 3 Si 2 H 2 and the associated volume change is computed, closely matching experimental data. Entropic effects are considered to assess the dissociation temperature of H 2 , estimated to be at ∼800 K – again in good agreement with the experimentally observed transition temperature.
Bell BDC, Murphy ST, Grimes RW, et al., 2017, The effect of Nb on the corrosion and hydrogen pick-up of Zr alloys, ACTA MATERIALIA, Vol: 132, Pages: 425-431, ISSN: 1359-6454
Fossati PCM, Grimes RW, 2017, Cation ordering and oxygen transport behaviour in Sr1-3x/2LaxTiO3 perovskites, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 5, Pages: 5321-5331, ISSN: 2050-7488
Hodgson APJ, Jarvis KE, Grimes RW, et al., 2017, Advances in the development of a dissolution method for the attribution of iridium source materials, JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, Vol: 311, Pages: 1193-1199, ISSN: 0236-5731
Jackson ML, Burr PA, Grimes RW, 2017, Defect processes in Be12X (X = Ti, Mo, V, W), NUCLEAR FUSION, Vol: 57, ISSN: 0029-5515
Kuganathan N, Ghosh PS, Arya AK, et al., 2017, Energetics of halogen impurities in thorium dioxide, JOURNAL OF NUCLEAR MATERIALS, Vol: 495, Pages: 192-201, ISSN: 0022-3115
Pavlov T, Vlahovic L, Staicu D, et al., 2017, A new numerical method and modified apparatus for the simultaneous evaluation of thermo-physical properties above 1500 K: A case study on isostatically pressed graphite, THERMOCHIMICA ACTA, Vol: 652, Pages: 39-52, ISSN: 0040-6031
Pavlov TR, Wenman MR, Vlahovic L, et al., 2017, Measurement and interpretation of the thermo-physical properties of UO2 at high temperatures: The viral effect of oxygen defects, ACTA MATERIALIA, Vol: 139, Pages: 138-154, ISSN: 1359-6454
Pilania G, Whittle KR, Jiang C, et al., 2017, Using Machine Learning To Identify Factors That Govern Amorphization of Irradiated Pyrochlores, CHEMISTRY OF MATERIALS, Vol: 29, Pages: 2574-2583, ISSN: 0897-4756
Valu SO, Benes O, Manara D, et al., 2017, The high-temperature heat capacity of the (Th,U)O-2 and (U,Pu)O-2 solid solutions, JOURNAL OF NUCLEAR MATERIALS, Vol: 484, Pages: 1-6, ISSN: 0022-3115
Bell BDC, Murphy ST, Burr PA, et al., 2016, The influence of alloying elements on the corrosion of Zr alloys, CORROSION SCIENCE, Vol: 105, Pages: 36-43, ISSN: 0010-938X
Burr PA, Middleburgh SC, Grimes RW, 2016, Solubility and partitioning of impurities in Be alloys, JOURNAL OF ALLOYS AND COMPOUNDS, Vol: 688, Pages: 382-385, ISSN: 0925-8388
Chernatynskiy A, Auguste A, Steele B, et al., 2016, Elastic and thermal properties of hexagonal perovskites, COMPUTATIONAL MATERIALS SCIENCE, Vol: 122, Pages: 139-145, ISSN: 0927-0256
Cooper MWD, Kuganathan N, Burr PA, et al., 2016, Development of Xe and Kr empirical potentials for CeO2, ThO2, UO2 and PuO2, combining DFT with high temperature MD, JOURNAL OF PHYSICS-CONDENSED MATTER, Vol: 28, ISSN: 0953-8984
Galvin COT, Cooper MWD, Rushton MJD, et al., 2016, Thermophysical properties and oxygen transport in (Th-x, Pu1-x)O-2, SCIENTIFIC REPORTS, Vol: 6, ISSN: 2045-2322
Ghosh PS, Arya A, Dey GK, et al., 2016, A computational study on the superionic behaviour of ThO2, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 18, Pages: 31494-31504, ISSN: 1463-9076
Ghosh PS, Kuganathan N, Galvin COT, et al., 2016, Melting behavior of (Th,U)O-2 and (Th,Pu)O-2 mixed oxides, JOURNAL OF NUCLEAR MATERIALS, Vol: 479, Pages: 112-122, ISSN: 0022-3115
Hodgson APJ, Jarvis KE, Grimes RW, et al., 2016, Development of an iridium dissolution method for the evaluation of potential radiological device materials, JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, Vol: 307, Pages: 2181-2186, ISSN: 0236-5731
Jackson ML, Burr PA, Grimes RW, 2016, Resolving the structure of TiBe12, ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS, Vol: 72, Pages: 277-280, ISSN: 2052-5206
Jackson ML, Fossati PCM, Grimes RW, 2016, Simulations of threshold displacement in beryllium, JOURNAL OF APPLIED PHYSICS, Vol: 120, ISSN: 0021-8979
Liu X-Y, Cooper MWD, McClellan KJ, et al., 2016, Molecular Dynamics Simulation of Thermal Transport in UO2 Containing Uranium, Oxygen, and Fission-product Defects, PHYSICAL REVIEW APPLIED, Vol: 6, ISSN: 2331-7019
Pavlov T, Vlahovic L, Staicu D, et al., 2016, Experimental evaluation of the high temperature thermophysical properties of UO<inf>2</inf>, Pages: 1227-1235
High temperature properties of UO 2 are reported, in particular thermal conductivity, specific heat capacity, thermal diffusivity and melting point. All are measured with a single laser flash apparatus coupled with a numerical inverse method. The thermal conductivity, spectral emissivity, specific heat capacity, thermal diffusivity and melting point are in very good agreement with established literature values indicating the validity of the methodology and its potential for measuring these properties up to melting. The melting point was identified to be 3118 K ± 28 K. The thermal conductivity exhibits a minimum between 1800 K and 2100 K due to the competition between phonon scattering and an increase in the concentration of free charge carriers. The substantial increase in specific heat can be predominantly attributed to the formation of oxygen Frenkel pairs.
Bertolus M, Freyss M, Dorado B, et al., 2015, Linking atomic and mesoscopic scales for the modelling of the transport properties of uranium dioxide under irradiation, JOURNAL OF NUCLEAR MATERIALS, Vol: 462, Pages: 475-495, ISSN: 0022-3115
Burr PA, Middleburgh SC, Grimes RW, 2015, Crystal structure, thermodynamics, magnetics and disorder properties of Be-Fe-Al intermetallics, JOURNAL OF ALLOYS AND COMPOUNDS, Vol: 639, Pages: 111-122, ISSN: 0925-8388
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