Neutron inelastic scattering studies of UF[sub 4] and NpF[sub 4]

Journal Article · Thu Dec 01 00:00:00 EST 1994 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.467964· OSTI ID:6820085

Kern, S ^[1]; Lander, G H ^[2]; Soderholm, L ^[3]; Loong, C; Trouw, F ^[4]; West, M; Hoisington, D; Cort, B ^[5]; Welp, U ^[6]

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1. Department of Physics, Colorado State University, Fort Collins, Colorado 80523 (United States) Intense Pulsed Neutron Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
2. European Commission, JRC, Institute for Transuranium Elements, Postfach 2340, D-76125 Karlsruhe (Germany)
3. Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
4. Intense Pulsed Neutron Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
5. Nuclear Materials Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
6. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

Neutron inelastic scattering experiments have been performed on UF[sub 4] and NpF[sub 4]. We had anticipated observing a number of sharp magnetic transitions in these experiments because the tetravalent metal ions are expected to have localized [ital f] states. However, very few transitions were observed, three and two in UF[sub 4] and NpF[sub 4], respectively. Except for the lowest-lying level (at 1.5 meV) in UF[sub 4] the transitions are wider than the instrumental resolution, suggesting a strong interaction between the electronic states and lattice vibrations. The levels observed do not correspond to those predicted by a crystal-field scheme recently proposed from optical spectroscopy. However, the paucity of observed levels in our experiments excludes us proposing an alternative scheme. The 1.5 meV energy level in UF[sub 4] is in good agreement with that deduced from specific heat and magnetic susceptibility data.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6820085
• Journal Information: Journal of Chemical Physics; (United States), Vol. 101:11; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NEPTUNIUM FLUORIDES
MAGNETIC PROPERTIES
URANIUM FLUORIDES
ACTINIDE COMPOUNDS
CRYSTAL FIELD
ELECTRON-PHONON COUPLING
INELASTIC SCATTERING
LATTICE VIBRATIONS
MAGNETIC SUSCEPTIBILITY
NEUTRON DIFFRACTION
RESOLUTION
SPECIFIC HEAT
COHERENT SCATTERING
COUPLING
DIFFRACTION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
NEPTUNIUM COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
THERMODYNAMIC PROPERTIES
TRANSURANIUM COMPOUNDS
URANIUM COMPOUNDS
360606* - Other Materials- Physical Properties- (1992-)