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Systematics of Mössbauer hyperfine parameters in Np intermetallics

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Abstract

Data for intermetallic compounds of neptunium obtained with the 60 keV Mössbauer resonance of237Np are reviewed. Measurements of temperature, pressure and field dependencies are available. The main questions addressed are: (a) the degree of delocalization of 5f-electrons, (b) the formal charge state of Np, and (c) the influence of the ligand on the neptunium electronic structure. For this purpose, we present an evaluation of systematic behavior concerning mainly the hyperfine field and isomer shift in the cubic Laves phase materials NpX2, the NaCl-type monochalcogenides and monopnictides, and intermetallics with AuCu3 and ThCr2Si2 structures. Analogies to corresponding rare-earth compounds will be pointed out.

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Authors and Affiliations

  1. Physik Department, Technische Universität München, D-8046, Garching, Germany

    G. M. Kalvius, J. Gal, L. Asch & W. Potzel

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  1. G. M. Kalvius
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  2. J. Gal
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  3. L. Asch
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  4. W. Potzel
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Additional information

Work supported by the German Federal Minister for Research and Technology (BMFT) under Contract No. 03-KA2-TUM-4.

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Kalvius, G.M., Gal, J., Asch, L. et al. Systematics of Mössbauer hyperfine parameters in Np intermetallics. Hyperfine Interact 72, 75–95 (1992). https://doi.org/10.1007/BF02398857

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