caa a22 4500 465732399 CHVBK 20180323111745.0 cr unu---uuuuu 170327e19901101xx s 000 0 eng 10.1007/BF02117554 doi (NATIONALLICENCE)springer-10.1007/BF02117554 Mössbauer spectroscopy of237Np in solid solutions of actinide dioxides [Elektronische Daten] [V. Filin, V. Gorbunov, S. Ulanov] Emission Mössbauer (nuclear gamma-resonance) spectra of237Np resulting from the alpha-decay of241Am in solid solutions AmO2−ThO2 and AmO2−UO2 prepared by precipitation from LiF−NaF eutectic melts under fluorine-oxygen exchange were first investigated in the temperature range from 77 to 296 K. The resonant absorbers are NpO2 and NpAl2. The possibility is stated of managing the form of the emission Mössbauer spectra of237Np in dioxides by the directed change of the matrix stoichiometry or by its irradiation by visible light. At temperatures from 77 to 230 K the authors measured for the first time the NGR absorption spectra of237Np in solid solution NpO2−ThO2 with various concentrations of neptunium dioxide. An increase of the absorption line width (approximately by a factor of 4) with a decrease in the NpO2 contents (to 10 mol.%) was explained by the influence of fast electron exchange between Np4+ and Np5+ states observed in the NpO2−ThO2 solid solution at low concentrations of neptunium dioxide. Akadémiai Kiadó, 1990 Filin V. All-Union Scientific and Research Institute of Inorganic Materials, Moscow, (USSR) aut Gorbunov V. All-Union Scientific and Research Institute of Inorganic Materials, Moscow, (USSR) aut Ulanov S. All-Union Scientific and Research Institute of Inorganic Materials, Moscow, (USSR) aut Journal of Radioanalytical and Nuclear Chemistry Articles Springer Netherlands 143/1(1990-11-01), 125-134 0236-5731 143:1<125 1990 143 10967 https://doi.org/10.1007/BF02117554 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02117554 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Filin V. All-Union Scientific and Research Institute of Inorganic Materials, Moscow, (USSR) aut NATIONALLICENCE 700 1- Gorbunov V. All-Union Scientific and Research Institute of Inorganic Materials, Moscow, (USSR) aut NATIONALLICENCE 700 1- Ulanov S. All-Union Scientific and Research Institute of Inorganic Materials, Moscow, (USSR) aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Articles Springer Netherlands 143/1(1990-11-01), 125-134 0236-5731 143:1<125 1990 143 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer