X- and neutron diffraction study of UCr/sub 2/O/sub 6/ monocrystal. Determination of crystallographical and magnetic structures (in French)
- CNRS, Grenoble, France
The structure of UCr/sub 2/O/sub 6/, PbSb/sub 2/O/sub 6/ type compound was refined from x-ray and neutron single crystal data. The symmetry is trigonal, space group P31m. The lattice parameters are a = 4.990 (1) A; c = 4.622 (1)A. There is one molecule per unit cell. The uranium, chromium, and oxygen atoms occupy the 1a (0,0,0), 2d(1/3, 2/3, 1/2), 6k(x,0,z) positions, respectively, with x = 0.3405 (3) and z = 0.2647 (2). The final R factors are 0.033 for the x-ray data and 0.0294 for the neutron data. The anisotropic temperature factors have been introduced in last stage of both refinements. The average cation-anion interatomic distances are U--O = 2.094 (1) A, Cr--O = 1.9726 (8) A. From these values it can be deduced that the uranium and chromium are hexavalent and trivalent respectively. From powder diffraction diagrams at 298 and 4.2/sup 0/K, it has been determined that the spin of the Cr/sup 3 +/ are located in the basal plane with an antiferromagnetic type arrangement. The value of the magnetic moment is 2.6 ..mu..B. (auth)
- OSTI ID:
- 7365377
- Journal Information:
- J. Solid State Chem.; (United States), Vol. 16:1-2
- Country of Publication:
- United States
- Language:
- French
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Related Subjects
CHROMATES
CRYSTAL STRUCTURE
MAGNETIC PROPERTIES
URANIUM COMPOUNDS
BOND LENGTHS
LATTICE PARAMETERS
MAGNETIC MOMENTS
MONOCRYSTALS
NEUTRON DIFFRACTION
SPIN
X-RAY DIFFRACTION
ACTINIDE COMPOUNDS
ANGULAR MOMENTUM
CHROMIUM COMPOUNDS
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
SCATTERING
TRANSITION ELEMENT COMPOUNDS
400702* - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials