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AbstractAbstract
[en] Analyses have been made of the regularities in the change of properties of transuranium elements during their transition from lower to a higher degree of oxidation with a change in the atomic number of the elements. The results are of importance in forecasting the existence and properties of new valence forms of transuranium elements
Original Title
Novye dannye po khimii neptuniya (7) i plutoniya (7)
Source
Conference on neptunium and plutonium chemistry; Leningrad, USSR; 25 Mar 1975; 32 refs.; for English translation see the journal Sov. Radiochem.
Record Type
Journal Article
Literature Type
Conference
Journal
Radiokhimiya; v. 17(5); p. 677-683
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AbstractAbstract
[en] A review of studies published in 1975-1982 and devoted to investigation of redox properties of Np and Pu ions and their reactions is given. The main attenitin is paid to kinetics and mechanism of these reactions. New experimental and calculation data on ion pair potentials and reaction thermodynamics are considered. Redox reactions in complexing. solutions, organic solvents, molten salts and heterogeneous systems are discussed
Original Title
Novye issledovaniya okislitel'no-vosstanoviyel'nykh reaktsij neptuniya i plutoniya
Source
2. All-Union conference on chemistry of neptunium and plutonium; Leningrad (USSR); 23-25 Nov 1985; For English translation see the journal Soviet Radiochemistry (USA).
Record Type
Journal Article
Literature Type
Conference
Journal
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AbstractAbstract
[en] Consideration is being given to methods of preparation, structure, physical and chemical properties of some TUE compounds from neptunium up to einsteinium inclusively. The following compounds were considered among others: hydrides, binary and mixed carbides, silicides, simple and complex nitrides, phosphides, arsenides, antimonides, bismuthides, simple and mixed oxides, binary and mixed sulfides, oxysulfides, selenides, oxyselenides, tellurides, oxytellurides, mixed compounds with elements of the 5th and 6th groups of the periodic system
Original Title
Soedineniya TUEh s otdel'nymi ehlementami; TUE (transuranium elements)=Np-Es
Source
Gel'man, A.D. (ed.); AN SSSR, Moscow. Inst. Fizicheskoj Khimii; p. 21-91; 1987; p. 21-91; Nauka; Moscow (USSR); 407 refs.; 35 figs.; 50 tabs.
Record Type
Book
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INIS IssueINIS Issue
AbstractAbstract
[en] Methods of preparation, structure, physical and chemical properties of some compounds of transuranium elements in various oxidation degrees from neptunium to californium inclusively are considered. The following compounds were studied among others: hydroxides of neptunium (4-6), plutonium (3-6), americium (3-5), curium (3), berkelium (3), californium (3), peroxides of americium (3), neptunium (4, 5), plutonium (4), borohydrides (and their substituted) neptunium (4), plutonium (4)
Original Title
Drugie soedineniya TUEh; TUE (transuranium elements)=Np-Cf
Secondary Subject
Source
Gel'man, A.D. (ed.); AN SSSR, Moscow. Inst. Fizicheskoj Khimii; p. 294-300; 1987; p. 294-300; Nauka; Moscow (USSR); 42 refs.; 1 fig.; 3 tabs.
Record Type
Book
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] A series of compounds of general composition MAm(C2O4)2xnH2O, where M-Na, NH4, or Cs, has been synthesized. Concentration values, of sodium, ammonium or cesium oxalates are found, at which different crystallohydrates are stable. They are isostructural to previously identified phases of the composition KAm(C2O4)2xnH20, Where p=5, 3.5 and 2.5. COpditions for crystallohydrate CsAm(C2O4)2x0.5H2O separation are established. Behaviour of praseodymium and terbium under the conditions studied is also considered. Using the method of thermogravimetry it is shown that NH4Am(C2O4)2x5H2O begins to lose water at approximately 90 deg C and burns at approximately 330 deg C with the formation of AmO2
Original Title
O kompleksnykh oksalatakh ameritsiya(3) s ionami natriya, ammoniya i tseziya vo vneshnej sfere
Source
For English translation see the journal Soviet Radiochemistry (USA).
Record Type
Journal Article
Journal
Radiokhimiya; ISSN 0033-8311;
; v. 25(5); p. 639-642

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AbstractAbstract
[en] Treatment of Np(IV) oxalate with an NH4OH solution produces an Np hydroxide with the minimal amount of oxalate and Np(V) impurities that is suitable for preparing Np sols. Peptization using HCl, HNO3, and CH3CO2H produces stable Np(IV) sols with 2-2.5 M Np and less than 4% Np(V). Their spectra are presented
Source
Translated from Radiokhimiya; 35: No. 3, 8-11(May-Jun 1993).
Record Type
Journal Article
Literature Type
Translation
Journal
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AbstractAbstract
[en] General characteristic of transuranium elements (TUE) from neptunium up to einsteinium inclusively is given. Nuclear properties of major isotopes and physicochemical properties of elements in metallic state are presented. Electron structure, oxidation states, ion TUE forms and their corresponding absorption spectra in solutions are considered. TUE complexing in solut ions, redox reactions, as well as the methods for TUE preparation in assigned oxidation states are discussed
Original Title
Obshchaya kharakteristika transuranovykh ehlementov; Np-Es
Source
Gel'man, A.D. (ed.); AN SSSR, Moscow. Inst. Fizicheskoj Khimii; p. 5-20; 1987; p. 5-20; Nauka; Moscow (USSR); 48 refs.; 7 figs.; 8 tabs.
Record Type
Book
Country of publication
Reference NumberReference Number
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AbstractAbstract
[en] Neptunium (5) behaviour in molybdate solutions is studied. M3NpO2Mo4O14 composition compounds where M is NH4 or K, (NpO2)2MoO4xnH2O composition compounds where n is 1.5-2.0 and (NpP2)2MoO4 are separated. Conditions for preparation of these compounds are studied, IR spectra, data of X-ray phase analysis are presented. (NpO2)2MoO4 is shown to be stable at the temperature upto 500 deg C; it is suggested to use this compound as a target for neutron irradiation
Original Title
Sintez molibdatnykh soedinenij neptuniya (5)
Source
For English translation see the journal Soviet Radiochemistry (USA).
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Journal Article
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AbstractAbstract
[en] Disproportionation of Pu(5) has been studied in hydrochloric acid solutions of methanol and its mixture with benzene and acetonitrile. In hydrochloric methanol solutions plutonium(5) has been shown to disproportionate irreversibly with the formation of chloride complexes of Pu(4) and Pu(6). As compared with aqueous solutions the rate of disproportionation increases greatly. An effect of concentration of HCl, water, and additives of benzene and acetonitrile on the reaction rate constant has been studied. Addition of benzene and acetonitrile accelerates the reaction sharply, whereas addition of water decreases monotonously the reaction rate. HCl accelerates the reaction
Original Title
Disproportsionirovanie pyativalentnogo plutoniya v organicheskikh rastvorakh
Source
For English translation see the journal Sov. Radiochem.
Record Type
Journal Article
Journal
Radiokhimiya; v. 20(5); p. 656-660
Country of publication
ACTINIDE COMPOUNDS, ALCOHOLS, AROMATICS, CHARGED PARTICLES, CHEMICAL REACTIONS, CHLORINE COMPOUNDS, HALOGEN COMPOUNDS, HYDROCARBONS, HYDROGEN COMPOUNDS, HYDROXY COMPOUNDS, INORGANIC ACIDS, IONS, KINETICS, ORGANIC COMPOUNDS, ORGANIC NITROGEN COMPOUNDS, OXYGEN COMPOUNDS, REACTION KINETICS, TRANSURANIUM COMPOUNDS
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AbstractAbstract
[en] A method is described for reducing the concentration of neptunium and plutonium from alkaline radwastes containing plutonium and neptunium values along with other transuranic values produced during the course of plutonium production. The OH- concentration of the alkaline radwaste is adjusted to between about 0.1M and about 4M. [UO2(O2)3]4- ion is added to the radwastes in the presence of catalytic amounts of Cu+2, Co+2 or Fe+2 with heating to a temperature in excess of about 60 C or 85 C, depending on the catalyst, to coprecipitate plutonium and neptunium from the radwaste. Thereafter, the coprecipitate is separated from the alkaline radwaste. 2 figs
Primary Subject
Source
17 Jun 1997; 20 Mar 1996; [10 p.]; US PATENT DOCUMENT 5,640,668/A/; US PATENT APPLICATION 8-618,922; Available from Patent and Trademark Office, Box 9, Washington, DC 20232 (United States); Application date: 20 Mar 1996
Record Type
Patent
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