Sub-tracer Scale Behaviour of Radionuclides. Application to Actinide Chemistry

Guillaumont, R.; Adloff, J.P.; Peneloux, André; Delamoye, P.

doi:10.1524/ract.1991.54.1.1

Cited by 53 publications

(25 citation statements)

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“…However, such investigations are extremely difficult because only a few atoms of short-lived isotopes can be produced at heavy ion accelerators. Under thesc conditions, the classical law of mass action is not a priori valid [12], In addition, if the kinetics of the chemical reactions are too slow the volatile molecules cannot be formed in due time [13]. This necessitates investigations with molecules of chemical homologs with similar volatility which are also produced at subtracer levels.…”

Section: Introductionmentioning

confidence: 99%

Gas Phase Chromatography Experiments with Bromides of Tantalum and Element 105

et al. 1992

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Element 105 / Transition metal group V / Chemical properties / Bromides / Volatility / Gas chromatography AbstractThe retention behavior of volatile bromide molecules of shortlived isotopes of tantalum and element 105 in KCl coated quartz columns was studied using continuous isothermal gas chromatography. HBr and HBr saturated with BBrs vapor were used as reactive gases. The isotopes were produced in the fusion reactions ^°Ne+"" Eu and ^^O + ^^^Bk, respectively. The reaction producta were transported from the accelerator to the chromatography set-up with a gas-jet system using an aerosol with He as carrier gas and KCl as transporting particles. The measured retention times are compared to those of "'Nb bromides from a previous study. The retention times of niobium and tantalum bromides are very similar, in agreement with expectations based on the nearly identical Sublimation enthalpies of NbBrj and TaBr;. For the bromides of element 105, higher retention times are found, indicating a lower volatility of lOSBrs than of NbBrs and TaBrs. On the basis of empirical systematics, a Sublimation enthalpy of 138± 15 kJ/mol can be estimated for 105Br5 from the experimental data.

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Section: Introductionmentioning

confidence: 99%

Gas Phase Chromatography Experiments with Bromides of Tantalum and Element 105

et al. 1992

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“…(5), the slopes in the linear fits in Figure 2 correspond to the number of protonated TIOA ions in the extracted neutral metal complex, [16,17]. The presently obtained result indicates that the species extracted from 7.4 M HCl solution is (R 3 NH) 2 [MCl 6 ], in which two protonated TIOA ions assemble with the anionic Zr or Hf chloride complex, as indicated in the literature [16,17]. Accordingly, protonation of TIOA, chloride-metal complex formation, ion-pair complex formation, and the extraction reaction of the ion-pair complex take place in the present extraction process as described in the literature [13,18,19].…”

Section: Resultsmentioning

confidence: 73%

Solvent Extraction of Zirconium and Hafnium as Homologues of Rutherfordium by Triisooctylamine from HCl Solutions

Kino

Kasamatsu

Yokokita

et al. 2015

SERDJ

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“…As a single atom cannot exist in different chemical forms taking part in the chemical equilibrium at the same time the classical law of mass action is no longer valid [86,87]. For single atoms, the concept of chemical equilibrium is substituted by an equivalent expression in which concentrations, activities, or partial pressures are replaced by probabilities to find an ion, molecule, or atom in one state or the other provided that the exchange is fast enough [88].…”

Section: Experimental Techniquesmentioning

confidence: 99%

Chemistry of superheavy elements

Schädel

2012

Radiochimica Acta

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Summary. The chemistry of superheavy elements -or transactinides from their position in the Periodic Table -is summarized. After giving an overview over historical developments, nuclear aspects about synthesis of neutron-rich isotopes of these elements, produced in hot-fusion reactions, and their nuclear decay properties are briefly mentioned. Specific requirements to cope with the one-atom-at-a-time situation in automated chemical separations and recent developments in aqueous-phase and gas-phase chemistry are presented. Exciting, current developments, first applications, and future prospects of chemical separations behind physical recoil separators ("pre-separator") are discussed in detail. The status of our current knowledge about the chemistry of rutherfordium (Rf, element 104), dubnium (Db, element 105), seaborgium (Sg, element 106), bohrium (Bh, element 107), hassium (Hs, element 108), copernicium (Cn, element 112), and element 114 is discussed from an experimental point of view. Recent results are emphasized and compared with empirical extrapolations and with fully-relativistic theoretical calculations, especially also under the aspect of the architecture of the Periodic Table.

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Sub-tracer Scale Behaviour of Radionuclides. Application to Actinide Chemistry

Cited by 53 publications

References 0 publications

Gas Phase Chromatography Experiments with Bromides of Tantalum and Element 105

Gas Phase Chromatography Experiments with Bromides of Tantalum and Element 105

Solvent Extraction of Zirconium and Hafnium as Homologues of Rutherfordium by Triisooctylamine from HCl Solutions

Chemistry of superheavy elements

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