Reactions of 40Ar with 233U, 235U, and 238U at the barrier

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Sorption of subgroup IV, V and VI elements on ion exchangers from HCI/HF solutions model experiments for chemical studies of the elements 105 and 106 in aqueous solution

The distribution coefficients of Zr, Hf, Nb, Ta, Mo, W, and Pa on cation and anion exchange resins from mixed HCl HF solutions were determined in batch experiments by radiometric measurements. From solutions of 0.05 to 0.1 M HCl with 1.0x10"-"3 M HF a separation of subgroup V and VI from subgroup IV elements is possible on DOWEX 50x8. This system is proposed for the fast on-line separation of the elements 105 and 106. In column experiments with cation exchangers W can be separated from Mo. This opens the possibility to determine the chemical behaviour of element 106 in comparison to the lighter homologs. Differences in the sorption behaviour of Ta, Nb and Pa on cation exchange resins from 0.1 M HCl 2.0x10"-"4 M HF solution should allow a statement as to which of these elements element 105 has the highest similarity. (orig.)SIGLEAvailable from TIB Hannover: RA 3692(95-48) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Chemical properties of element 105 in aqueous solution: Back extraction from triisooctyl amine into 0.5 m HCl

SIGLEAvailable from TIB Hannover: RO 801(92-26) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Chemical properties of element 105 in aqueous solution: Extractions into diisobutylcarbinol

SIGLEAvailable from FIZ Karlsruhe / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Gas phase chromatography of halides of elements 104 and 105

On-line isothermal gas phase chromatography was used to study halides of {sup 261}104 (T{sub {1/2}} = 65 s) and {sup 262,263}105 (T{sub {1/2}} = 34 s and 27 s) produced an atom-at-a time via the reactions {sup 248}Cm({sup 18}O, 5n) and {sup 249}Bk({sup 18}O, 5n, 4n), respectively. Using HBr and HCl gas as halogenating agents, we were able to produce volatile bromides and chlorides of the above mentioned elements and study their behavior compared to their lighter homologs in Groups 4 or 5 of the periodic table. Element 104 formed more volatile bromides than its homolog Hf. In contrast, element 105 bromides were found to be less volatile than the bromides of the group 5 elements Nb and Ta. Both 104 and Hf chlorides were observed to be more volatile than their respective bromides. 31 refs., 8 figs