[en] Two types of the stability diagram are generally constructed to represent the speciation of the species in a multicomponent system. One plots the domains of predominance that has been discussed in Part 1 of this series. The other plots the distribution of the mass involved called distribution diagrams. Basically, distribution diagrams can be constructed according to the equations of equilibria and mass balances. Because there is only one independent variable, the diagram can be plotted as a function of one particular parameter such as potential, pH, or concentration of the main component or ligand component. Equations can be solved numerically by Newton-Raphson iteration. Some important considerations that are not found in other literature are presented. The method and considerations discussed are not limited to a microcomputer, they can be applied to a mainframe computer as well. Uranium in seven ligand components are used for demonstration

No abstract available

[en] Different fundamental research papers on uranium IV are presented, some were never edited. Molecular spectroscopy was used for identification and structural study of uranium IV in aqueous or organic solutions. The fields studied are: coordination, stereochemistry, electronic structure and chemical properties. For interpretation of results some studies were made with solid compounds or with thorium compounds or thorium complexes. Knowledge of actinides chemistry is improved, uranium and thorium being models for 5 f ions, extractive chemistry is better understood and new applications are possible

No abstract available

[en] The description of uranium and its compounds, for which the Gmelin Institute has started a series of volumes supplementing the main volume of 1936, follows closely in its arrangements the order chosen for the transuranium volumes. Part A treats ''The Element'', Part B ''The Metal and its Alloys'', Part C ''The Compounds'', Part D ''The Chemistry in Solution'', and finally Part E ''The Coordination Compounds''. Part E comprises two volumes which already have been finished and are available - written completely in English

No abstract available

[en] Experimental studies have been carried out to analyse the influence of the rate of heat extraction, mold preheat temperature and superheat temperature during pouring, on the type and intensity of macrosegregations in Al-U alloys. Solidification structures in hypereutetic Al-U alloys are presented and the influence of the above mentioned factors qualitatively analyzed. (Author)

[en] A DFT study of U(VI) hydroxy complexes was performed with special attention paid to the [(UO_2)_3(OH)_5(H_2O)_4_-_7]"+ and [(UO_2)_4(OH)_7(H_2O)_5_-_8]"+ species. It was established that the ionicity of the U=O bond increased when moving from [(UO_2)(H_2O)_5]"2"+, [(UO_2)_2(OH)(H_2O)_8]"3"+, [(UO_2)_2(OH)_2(H_2O)_6]"2"+, [(UO_2)_3(OH)_5(H_2O)_4_-_6]"+ to [(UO_2)_4(OH)_7(H_2O)_5_-_8]"+ species. In both [(UO_2)_3(OH)_5(H_2O)_4_-_6]"+ and [(UO_2)_4(OH)_7(H_2O)_5_-_8]"+ complexes, the U=O bond was observed to have a range of different lengths which depended on the composition of the first coordination sphere of UO_2"2"+. The cyclic structures of trimeric complexes were somewhat more stable than their linear structures, which was probably due to the steric effect. (author)

[en] The application of band theory to actinide systems is examined. The fundamental aspects are considered to define the limits of applicability. We then consider the more practical approximate applications to demonstrate their underlying assumptions and range of applicability. Examples are drawn primarily from our own work on Th, α-U and UGe₃

[en] Major producers of Mo-99 still generators which producers of Mo-99 still use targets containing highly enriched uranium (HEU). However, the international non-proliferation policy currently emphasizes the minimization of the use of HEU in medical radioisotope production. Therefore, low enriched uranium (LEU) targets have been developed by casting and crushing of UAl₂ compounds. The UAl₂ particle dispersed target has a lower U-235 density of the conventional UAl₂ dispersion targets is known to be lower than 2.7g-U/cm². To improve the low production efficiency of LEU targets, target designers try to develop high uranium density targets with LEU. KAERI has proposed that high density uranium alloys, instead of UAl₂, can be used as dispersing particles in an aluminum matrix. While it is very difficult to fabricate uranium alloys powder by grinding or crushing, spherical powders of uranium alloy can be produced easily by centrifugal atomization. Mini-size targets with 3, 6, and 9 g-U/cm³ were fabricated in this study to investigate the feasibility of high density targets with atomized uranium particles. The microstructural changes after thermal treatments were observed to analyze the interaction behavior of uranium particles and an aluminum matrix. · An mini-size dispersion target with atomized uranium particles up to 9 g-U/cm³ were fabricated by hot rolling at 500 .deg. C. · Atomized uranium particles react with the aluminum matrix to form UAl_x phases during the fabrication processes. · Most of the uranium particles in the dispersion targets were converted into UAl_x after annealing at 700 .deg. C