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4 results on '"N V Aksenov"'

1. Anion Exchange Behavior Of Ti, Zr, Hf, Nb And Ta As Homologues Of Rf And Db In Mixed HF—Acetone Solutions

Author

N. V. Aksenov, G. A. Bozhikov, G. Ya. Starodub, S. N. Dmitriev, D. V. Filosofov, Jon Sun Jin, V. I. Radchenko, N. A. Lebedev, A. F. Novgorodov, Yu. E. Penionzhkevich, and S. M. Lukyanov

Subjects
chemistry.chemical_compound, Aqueous solution, Hydrofluoric acid, Ion exchange, Transition metal, Chemistry, Inorganic chemistry, Rutherfordium, Analytical chemistry, Acetone, chemistry.chemical_element, Sorption, Fluoride
Abstract

We studied in detail the sorption behavior of Ti, Zr, Hf, Nb and Ta on AG 1 anion exchange resin in HF-acetone mixed solutions as a function of organic cosolvent and acid concentrations. Anion exchange behavior was found to be strongly acetone concentration dependent. The distribution coefficients of Ti, Zr, Hf and Nb increased and those of Ta decreased with increasing content of acetone in HF solutions. With increasing HF concentration anion exchange equilibrium analysis indicated the formation of fluoride complexes of group 4 elements with charge-3 and Ta---2. For Nb the slope of-2 increased up to-5. Optimal conditions for separation of the elements using AIX chromatography were found. Group 4 elements formed MF{sub 7}{sup 3-} (M = Ti, Zr, Hf) complexes whose sorption decreased Ti>Hf>Zr in reverse order of complex stability. This fact is of particular interest for studying ion exchange behavior of Rf compared to Ti. The advantages of studying chemical properties of Rf and Db in aqueous HF solutions mixed with organic solvents are briefly discussed.

Published
2010

2. Confirmation Of Super Heavy Element Production In [sup 48]Ca Induced Fusion Reactions A Handshake Of Physics And Chemistry For Element 112

Author

Pasi Kuusiniemi, M. Venhart, B. Streicher, F. Haenssler, Zibao Gan, Grigory K. Vostokin, J. A. Heredia, A. V. Shutov, Yu. Ts. Oganessian, I. Kojouharov, S. V. Shishkin, Katsuhisa Nishio, V. Ya. Lebedev, A. V. Belozerov, Rugard Dressler, Evgeny E. Tereshatov, Stefan G. Hofmann, M. Leino, Juha Uusitalo, Bettina Lommel, Peter Rasmussen, V. F. Comas, H. J. Schött, D. Piguet, A. G. Popeko, S. N. Dmitriev, H. W. Gäggler, M. Wegrzecki, R. Mann, Andreas Laube, Robert Eichler, Birgit Kindler, Jadambaa Khuyagbaatar, N. V. Aksenov, O. V. Petrushkin, F. P. Heβberger, V. I. Chepigin, B. Sulignano, S. Heinz, A. V. Yeremin, A. I. Svirikhin, Dieter Ackermann, V. A. Gorshkov, G. Münzenberg, M. G. Itkis, S. Antalic, S. Saro, G. A. Bozhikov, O. N. Malyshev, and H. G. Burkhard

Subjects
Nuclear physics, Nuclear reaction, Physics, Uranium-238, Handshake, Scattering, Evaporation, Nuclear fusion, Mass spectrometry, Atomic mass
Abstract

The production of 283112 in 48Ca induced nuclear reactions was investigated using physical and chemical separation techniques. In the reaction 48Ca on 238U, four events were registered at the SHIP velocity filter. The mean atomic mass of the evaporation residues (EVR)

Published
2008

3. Radiochemical Separation of Group 5 Elements. Model Experiments for Investigation of Dubnium Chemical Behaviour

Author

E. E. Tereshatov, H. Bruchertseifer, G. A. Bozhikov, N. V. Aksenov, G. Ya. Starodub, G. K. Vostokin, S. V. Shishkin, S. N. Dmitriev, H. W. Gäggeler, Yu. E. Penionzhkevich, and E. A. Cherepanov

Subjects
Lanthanide, Dubnium, Radiochemistry, Protactinium, Analytical chemistry, chemistry.chemical_element, Transactinide element, Actinide, Isotope separation, law.invention, chemistry.chemical_compound, Hydrofluoric acid, chemistry, law, Transuranium element
Abstract

Chemical behaviour of group 5 elements in the aqueous hydrofluoric acid solutions was studied. The radiochemical method for the cation exchange separation of Nb (Pa) and Ta from Zr, Hf and lanthanides is presented. The developed scheme allows excluding of the presence of SF heavy actinides in fractions of separated elements. On the basis of the data of the present work, it is possible to suggest the following order of the stability of the fluoride complexes of group 4 and 5 elements: Nb ≈ Pa > Zr > Hf > Ta. The order of the complex formation is in agreement with theoretical predictions. This analytical procedure can be used in future heavy nuclei synthesis experiments for the separation of dubnium (Db) from other reactions products and for its chemical identification.

Published
2007

4. Radiochemical Separation of Zr and Hf by Cation Exchange Chromatography in HCl/HF Solutions: A Model System for the Chemical Identification and Study of Rf

Author

N. V. Aksenov, G. A. Bozhikov, E. E. Tereshatov, G. K. Vostokin, S. V. Shishkin, S. N. Dmitriev, H. Bruchertseifer, H. W. Gäggeler, Yu. E. Penionzhkevich, and E. A. Cherepanov

Subjects
Zirconium, Ion chromatography, Inorganic chemistry, Refractory metals, chemistry.chemical_element, Hydrochloric acid, Isotope separation, law.invention, chemistry.chemical_compound, Hydrofluoric acid, chemistry, Transition metal, law, Rutherfordium
Published
2007

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