Results 151 to 160 of about 2,765 (199)
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The potential use of uranium oxides and uranium–bismuth mixed oxides in catalysis
J. Chem. Soc., Faraday Trans. 2, 1987The potential use of uranium in the field of catalysis is presented in the first part of this paper. Numerous applications of uranium binary oxides, as well as of mixed oxides, are reviewed with a special emphasis on the role of U–Sb–O catalysts in selective oxidation (and ammoxidation) processes. Attempts are made to correlate the electronic structure
Hervé Collette +5 more
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The anodic oxidation of uranium
Acta Metallurgica, 1954Abstract Over a range of 2–100 volts the anodic oxidation of uranium in ammoniacal ethylene glycol produces oxide films which are predominantly uranium dioxide in composition. The oxide formed in this manner shows considerable stability to atmospheric corrosion.
O Flint, J.J Polling, A Charlesby
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Applied Radiation and Isotopes, 2021
A nondestructive iterative method for uranium-bearing material characterization with HRGS developed earlier in Burdeinyi et al. (2020) is applied to determine matrix densities, uranium mass fraction and uranium isotope masses of uranium ore, UO2 and U3O8 powders, fuel elements in the form of UO2 microspheres, uranium metal and uranium alloys.
D. Burdeinyi +6 more
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A nondestructive iterative method for uranium-bearing material characterization with HRGS developed earlier in Burdeinyi et al. (2020) is applied to determine matrix densities, uranium mass fraction and uranium isotope masses of uranium ore, UO2 and U3O8 powders, fuel elements in the form of UO2 microspheres, uranium metal and uranium alloys.
D. Burdeinyi +6 more
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Oxidation of uranium monocarbide
Journal of the Less Common Metals, 1962Abstract Compacts of uranium monocarbide with a density of 11.7–12.7 g/cm 3 have been oxidized in I atm of CO 2 , O 2 , N 2 and CO at temperatures in the range 350–1000°C and all the reactions found to obey a linear rate law. The linear rate constants increased as the temperature increased and the density decreased, and for dense compacts were ...
K.A. Peakall, J.E. Antill
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Oxidation of uranium mononitride
Journal of Nuclear Materials, 1975Abstract The oxidation of powdered uranium mononitride begins at 200°C by a slow absorption of oxygen. Weakly crystallized products, U 2 N 3 and UO 2 , are formed. An intensive incorporation of oxygen occurs at 250° C accompanied by a loss of nitrogen. Simultaneously, the amount of U 2 N 3 diminishes and the α-UO 3 phase appears.
M Paljević, Z Despotović
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2018
Uranium, a silvery white metal, was isolated in 1841 by French chemist Eugene-Melchior Peligot (1811–1890) and named after the planet Uranus. Later, in 1896 French physicist Antoine Henri Becquerel (1852–1908) , showed that uranium salts and uranium were radioactive and, hence, discovered radioactivity for which he received the Nobel prize in 1903 ...
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Uranium, a silvery white metal, was isolated in 1841 by French chemist Eugene-Melchior Peligot (1811–1890) and named after the planet Uranus. Later, in 1896 French physicist Antoine Henri Becquerel (1852–1908) , showed that uranium salts and uranium were radioactive and, hence, discovered radioactivity for which he received the Nobel prize in 1903 ...
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Journal of Nuclear Materials, 1994
The steam oxidation rates of U-metal foil and bar stock have been measured thermogravimetrically between 473 and 823 K. Both materials exhibited Arrhenius-type behaviour in their steam oxidation rates below 573–623 K, with activation energies of 46.9 ± 3.3 kJ mol−1 for U foil below 623 K and 58.0 ± 3.8 kJ mol−1 for U bar stock below 573 K.
P.J. Hayward +4 more
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The steam oxidation rates of U-metal foil and bar stock have been measured thermogravimetrically between 473 and 823 K. Both materials exhibited Arrhenius-type behaviour in their steam oxidation rates below 573–623 K, with activation energies of 46.9 ± 3.3 kJ mol−1 for U foil below 623 K and 58.0 ± 3.8 kJ mol−1 for U bar stock below 573 K.
P.J. Hayward +4 more
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Journal of the American Ceramic Society, 1960
Results of a study of the cleavage of uranium dioxide crystals are presented. Previously a synthesized uranium dioxide crystal was found to have no cleavage. Here it was proven that uranium dioxide was cleaved both mechanicallyand by self-cleavage by controlled oxidation. A Laue x-ray back reflection study revealed cleavage in the {1 1 1} planes.
R. G. ROBINS, P. J. BALDOCK
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Results of a study of the cleavage of uranium dioxide crystals are presented. Previously a synthesized uranium dioxide crystal was found to have no cleavage. Here it was proven that uranium dioxide was cleaved both mechanicallyand by self-cleavage by controlled oxidation. A Laue x-ray back reflection study revealed cleavage in the {1 1 1} planes.
R. G. ROBINS, P. J. BALDOCK
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Tandem Mass Spectrometry of Uranium and Uranium Oxides in Airborne Particulates
Analytical Chemistry, 1998A method for detection of uranium in airborne microparticles in real time has been developed. Positive identification of uranium is achieved by isolating UO(2+) ions and following their reaction with residual oxygen molecules to yield UO(2)(+).
R A, Gieray +4 more
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Oxidation states of uranium in depleted uranium particles from Kuwait
Journal of Environmental Radioactivity, 2005The oxidation states of uranium in depleted uranium (DU) particles were determined by synchrotron radiation based mu-XANES, applied to individual particles isolated from selected samples collected at different sites in Kuwait. Based on scanning electron microscopy with X-ray microanalysis prior to mu-XANES, DU particles ranging from submicrons to ...
Salbu, B. +5 more
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