Moessbauer spectra and magnetic susceptibilities ofCs/sub 2/NpCl/sub 6/, ((C/sub 2/H/sub 3/)/sub 4/N)/sub 2/NpCl/sub 6/, and ((H/sub 3/)/sub 4/N)/sub 2/NpCl/sub 6/

Journal Article · Tue Jul 01 04:00:00 EDT 1980 · Phys. Rev., B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.22.111· OSTI ID:5220547

Karraker, D G; Stone, J A

Magnetic susceptibility measurements of Cs/sub 2/NpCl/sub 6/, ((C/sub 2/H/sub 5/)/sub 4/N)/sub 2/NpCl/sub 6/, and ((CH/sub 3/)/sub 4/N)/sub 2/NpCl/sub 6/ from 2.5 to 70 K show that the GAMMA/sub 8/ ground level of the Np/sup 4 +/ ion is split by 5--10 cm/sup -1/ in the first two compounds because of distortions from octahedral symmetry in these crystals. The GAMMA/sub 8/ level in ((CH/sub 3/)/sub 4/N)/sub 2/NpCl/sub 6/ is not split, and the measurements agree well with first-order theory for x=0.39 and g/sub J/=0.60. The Moessbauer spectra at 4.2 K of ((CH/sub 3/)/sub 4/N)/sub 2/NpCl/sub 6/ and ((C/sub 2/H/sub 5/)/sub 4/N)/sub 2/NpCl/sub 6/ are magnetically split, with a small quadrupole interaction. The spectrum of ((CH/sub 3/)/sub 4/N)/sub 2/NpCl/sub 6/ shows deviations from isotropic magnetic splitting that may be caused by interactions within the degenerate GAMMA/sub 8/ level. The Moessbauer spectrum of ((C/sub 2/H/sub 5/)/sub 4/N)/sub 2/NpCl/sub 6/ is consistent with two nonequivalent Np/sup 4 +/ sites. The Moessbauer spectrum of Cs/sub 2/NpCl/sub 6/ is obscured by intermediate relaxation effects.

• Research Organization: Savannah River Laboratory, E. I. du Pont de Nemours and Company, Aiken, South Carolina 29808
• OSTI ID: 5220547
• Journal Information: Phys. Rev., B: Condens. Matter; (United States), Journal Name: Phys. Rev., B: Condens. Matter; (United States) Vol. 22:1; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ACTINIDE COMPLEXES
ACTINIDE COMPOUNDS
AMMINES
CHLORIDES
CHLORINE COMPOUNDS
COMPLEXES
ENERGY LEVELS
GROUND STATES
HALIDES
HALOGEN COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MOESSBAUER EFFECT
NEPTUNIUM CHLORIDES
NEPTUNIUM COMPLEXES
NEPTUNIUM COMPOUNDS
PHYSICAL PROPERTIES
RELAXATION
TRANSURANIUM COMPLEXES
TRANSURANIUM COMPOUNDS
ULTRALOW TEMPERATURE