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AbstractAbstract
[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
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AbstractAbstract
No abstract available
Original Title
Complements au nouveau traite de chimie minerale
Source
1974; 171 p; Masson; Paris, France
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Mikhajlov, Yu.N.; Kanishcheva, A.S.; Ivanov, S.B.
Neorganical chemistry and technology of neorganic substances. Radiochemistry. Analytical chemistry. Coordination chemistry1981
Neorganical chemistry and technology of neorganic substances. Radiochemistry. Analytical chemistry. Coordination chemistry1981
AbstractAbstract
No abstract available
Original Title
Stereokhimiya prostykh i kompleksnykh soedinenij shestivalentnogo urana
Source
AN SSSR, Moscow; p. 156; 1981; p. 156; 12. Mendeleev's conference on general and applied chemistry; Moscow, USSR; 1981; Short note.
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Folcher, G.; Rigny, P.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. de Physico-Chimie1980
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. de Physico-Chimie1980
AbstractAbstract
[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
[fr]
On presente un ensemble de travaux de recherche fondamentale sur la valence IV de l'uranium, dont quelques uns n'ont jamais ete publies. L'approche suivie est celle de l'identification et de l'etude structurale des especes formees par l'uranium IV en solutions aqueuses ou organiques par spectroscopie moleculaire. Les domaines etudies concernent la coordinance, la stereochimie, la structure electronique et les proprietes chimiques. Des etudes de composes solides ou de composes analogues du thorium ont souvent ete faites pour servir de support aux interpretations. Ces resultats ameliorent la connaissance de la chimie des actinides, l'uranium et le thorium servant de modeles pour les ions 5 f, de mieux comprendre la chimie d'extraction et d'envisager de nouvelles applicationsOriginal Title
Spectroscopie et chimie de l'uranium IV
Source
Jun 1980; 184 p
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AbstractAbstract
[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
Secondary Subject
Source
1986; 317 p; National Petroleum Refiners Association; Washington, DC (USA); ISBN 0-387-93524-X; 

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Book
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AbstractAbstract
No abstract available
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Journal Article
Journal
J. Chem. Soc. (London), Chem. Commun; (no.4); p. 124
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Lima, R.M. de; Ambrozio Filho, F.
Proceedings of the 39. Annual Congress of the Brazilian Association of Metals1984
Proceedings of the 39. Annual Congress of the Brazilian Association of Metals1984
AbstractAbstract
[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)
[pt]
Sao realizados estudos experimentais com o objetivo de analisar a influencia da velocidade de extracao de calor, temperatura de pre-aquecimento do molde e da temperatura de superaquecimento no vazamento sobre o tipo e a intensidade da macrosegregacao de ligas Al-U. Sao apresentadas as formas e distribuicoes das estruturas de solidificacao obtidas nas ligas Al-U hipereuteticas, sendo feita uma analise qualitativa dos fatores descritos. (Autor)Original Title
Segregacao de uranio na solidificacao de lingotes de liga Al-U
Primary Subject
Source
Associacao Brasileira de Metais, Sao Paulo; 474 p; 1984; v. 4 p. 247-260; 39. Annual Congress of the Brazilian Association of Metals; Belo Horizonte, MG (Brazil); Jul 1984; Available from Centro de Informacoes Nucleares - Biblioteca Tecnico-Cientifica, Rio de Janeiro
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AbstractAbstract
[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)
Primary Subject
Source
43 refs.
Record Type
Journal Article
Journal
Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 313(2); p. 455-465

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AbstractAbstract
[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
Primary Subject
Source
3. International conference on electronic structure of the actinides; Grenoble, France; 30 Aug - 1 Sep 1978
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Journal Article
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Conference
Journal
J. Phys. (Paris), Colloq; (no.4); p. C4.117-C4.123
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Sim, Moonsoo; Ryu, Hojin; Park, Jongman; Kim, Changkyu; Lee, Jonghyeon
Proceedings of the KNS 2013 spring meeting2013
Proceedings of the KNS 2013 spring meeting2013
AbstractAbstract
[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 UAlx phases during the fabrication processes. · Most of the uranium particles in the dispersion targets were converted into UAlx after annealing at 700 .deg. C
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Korean Nuclear Society, Daejeon (Korea, Republic of); [1 CD-ROM]; May 2013; p. 775-776; 2013 spring meeting of the KNS; Kwangju (Korea, Republic of); 29-31 May 2013; Available from KNS, Daejeon (KR); 4 refs, 5 figs
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