Results 161 to 170 of about 464,807 (207)
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Nonstoichiometry in Uranium Dioxide
The Journal of Chemical Physics, 1958A thermodynamic study of the uranium-oxygen system, primarily in the single phase region UO2–UO2.20, has been made at temperatures of 1150° to 1350°K. An electrochemical technique was used to obtain emf measurements on uranium oxide half-cells.
S. Aronson, J. Belle
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Soviet Atomic Energy, 1973
1. We have presented some experimental results relating to the creep of polycrystalline sintered UO2 over the temperature range 1600–1900°K for stresses of 0.4–4 kg/mm2. 2. The deformation of the UO2 samples during the tests leads to the formation of inhomogeneities and the development of cracks. 3. The average creep velocity
Yu. V. Miloserdin +10 more
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1. We have presented some experimental results relating to the creep of polycrystalline sintered UO2 over the temperature range 1600–1900°K for stresses of 0.4–4 kg/mm2. 2. The deformation of the UO2 samples during the tests leads to the formation of inhomogeneities and the development of cracks. 3. The average creep velocity
Yu. V. Miloserdin +10 more
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Industrial & Engineering Chemistry, 1961
Results of a study of the mechanism of UO/sub 2/ activation by successive oxidation and reduction are presented. Surface area, pore size, and x- ray measurements showed that activation of aggregates of microcrystalline UO/sub 2/ resulted from separation, but not reduction in size, of primary crystallites. Hydrofluorination of UO/sub 2/ to UF/sub 4/ was
R. J. Bard, J. P. Bertino, D. L. Bunker
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Results of a study of the mechanism of UO/sub 2/ activation by successive oxidation and reduction are presented. Surface area, pore size, and x- ray measurements showed that activation of aggregates of microcrystalline UO/sub 2/ resulted from separation, but not reduction in size, of primary crystallites. Hydrofluorination of UO/sub 2/ to UF/sub 4/ was
R. J. Bard, J. P. Bertino, D. L. Bunker
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The Conversion of Uranium Hexafluoride to Uranium Dioxide
Nuclear Technology, 1973Four different methods for the conversion of UF6 to ceramic grade UO2 powder have been developed to an industrial scale.
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Analytical Chemistry, 1960
The deviation of the composition of uranium dioxide from the stoichiometric oxygen--uranium ratio of 2.000 is calculated from the assay for the uranium(VI) in the oxide. The sample is dissolved in hot phosphoric acid under an inert atmosphere to preserve the oxidation states of the metal, and the uranium(VI) is determined polarographically in a ...
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The deviation of the composition of uranium dioxide from the stoichiometric oxygen--uranium ratio of 2.000 is calculated from the assay for the uranium(VI) in the oxide. The sample is dissolved in hot phosphoric acid under an inert atmosphere to preserve the oxidation states of the metal, and the uranium(VI) is determined polarographically in a ...
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Dissolution of uranium dioxide in supercritical fluid carbon dioxide
Chemical Communications, 2001Uranium dioxide can be dissolved in supercritical CO2 with a CO2-philic TBP-HNO3 complexant to form a highly soluble UO2(NO3)(2).2TBP complex; this new method of dissolving UO2 that requires no water or organic solvent may have important applications for reprocessing of spent nuclear fuels and for treatment of nuclear wastes.
M D, Samsonov +4 more
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Rapid determination of uranium dioxide in uranium phosphides
The Analyst, 1968A rapid gravimetric method for the determination of uranium dioxide in uranium monophosphide and triuranium tetraphosphide is described. The phosphide compounds are dissolved in an ethyl acetate-hydrochloric acid solution and the remaining uranium dioxide oxidised in air to triuranium octoxide. A precision of ±0·2 per cent.
J. L. Driscoll, P. E. Evans
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Diffusion of uranium in titanium-doped uranium dioxide
Journal of Alloys and Compounds, 1993Abstract The diffusion coefficients of 233U in (U1−yTiy)O2+x (y=0, 0.001, 0.007) were measured in the oxygen partial pressure range from 10−8 to 10−2 Pa at 1673 and 1773 K by the α-energy degradation method. The ratios of the diffusion coefficient of uranium(DU) in titanium-doped UO2+x to those in undoped UO2+x were about 6 for y=0.007 at 1673 K and ...
Toshihide Tsuji +3 more
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Nonstoichiometry in Uranium Dioxide
The Journal of Chemical Physics, 1966An extension of Anderson's formulation of the defect theory of nonstoichiometry is used with an oxygen—interstitial oxygen-vacancy model to calculate the composition of the uranium dioxide phase at the lower phase boundary and the relative partial molar thermodynamic functions for oxygen at compositions ranging from the lower phase boundary to UO2.08 ...
R. J. Thorn, G. H. Winslow
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The oxidation of uranium dioxides
Journal of Biochemical Toxicology, 1965AbstractThe oxidation of three types of uranium dioxide (UO2) material has been investigated in the 120—360° range.In UO2 powders, of surface area greater than about 2 m.2/g., oxidation was diffusion‐controlled up to U3O7 which oxidised to U3O8 above about 240°.
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