M�ssbauer investigation of radiation self damage in241Am metal

Asch, L.; Potzel, W.; Beck, O.; Spirlet, J.C.; Müller, W.; Kalvius, Georg Michael

doi:10.1007/bf01021988

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…3); it is rather comparable to the situation found in transition elements, in particular in the 4d and Sd series [4,37]. These observations illustrate qualitatively the strong covalency of bonding in the compounds of Np and Am, with mixing of 5 f, 6 The δ ig of the fluorides represent an extremum of the range of values characteristic for each valence state of Np (the same behavior is observed for AmF3) (Fig. 3).…”

Section: Chemical Information From Isomer Shift Datasupporting

confidence: 76%

“…On the other hand, in the 241 Am sample stored at 4.2 Κ (after annealing at 300 K) a significant line broadening occurs between the time of the cooling and a delay of ~ 100 hrs., with saturation on a longer storage time [6]; the integrated resonance area is independent of storage time. Unfortunately, this behavior cannot be strictly reproduced on different samples for undetermined reasons [6,38,73]. It is suggested that these experiments represent the consequences of low temperature defect trapping by the 237 Np impurities in the Am host.…”

Section: Radiation Effects In Actinide Materials After Effects Omentioning

confidence: 98%

“…However, the resonance width and the central shift (6IS) reveal singular behaviors, with large anomalous temperature shifts between 4.2 Κ and 25 Κ and constant values at higher temperatures [6,38] (Fig. 19).…”

Section: Radiation Effects In Actinide Materials After Effects Omentioning

confidence: 99%

“…For instance, the area of the 237 Np emission spectra in 241 Am metal show a temperature dependence from 4.2 to 150Κ which is represented by a Debye model (0D = 120 ± 10 K) [6,38,73]. However, the resonance width and the central shift (6IS) reveal singular behaviors, with large anomalous temperature shifts between 4.2 Κ and 25 Κ and constant values at higher temperatures [6,38] (Fig.…”

Section: Radiation Effects In Actinide Materials After Effects Omentioning

confidence: 99%

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Mössbauer Spectroscopy in Actinide Research

Friedt¹

1983

Radiochimica Acta

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Actinide compounds /Mössbauer spectroscopy /Electronic structure /Crystal structure /Magnetism L Introduction Π. Information accessible to Mössbauer spectroscopy ΙΠ. Mössbauer spectroscopy in the actinide elements 1. Introduction 2. Reported resonances 3. Other possibilities IV.Electionic configuration, bonding and magnetic properties 1. Introductory survey of theoretical concepts 2. Chemical information from isomer shift data 3. Chemical information from electric field gradient data 4. Chemical information from magnetic hyperfine data V. Structural information: Crystallographic and magnetic phase transitions and structures VI. Radiation effects in actinide materials: After-effects of nuclear decays and of nuclear reactions; self-irradiation effects VII. Conclusions AbstractThe principles and possibilities of Mössbauer spectroscopy in actinide compounds are reviewed. A survey of applications of chemical character to problems of electronic structure, bonding properties, magnetism and phase transitions is given in order to illustrate the possibilities of Mössbauer spectroscopy. In particular, the recently very active problem of the elucidation of the type of phase transition occurring at low temperature in Np0 2 (~ 25 K) and Am0 2 ( ~ 10K) is discussed on the basis of recent experimental results using the 23 'Np and "'Am Mössbauer resonances. Problems connected with after-effects of nuclear decays, radiation damage and self-irradiation effects are emphasized with the aid of a series of new experimental results.

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Section: Chemical Information From Isomer Shift Datasupporting

confidence: 76%