Magnetic studies on (U, Y)O/sub 2 + x/ solid solutions

Journal Article · Sun Feb 01 04:00:00 EST 1987 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(87)90203-9· OSTI ID:6633494

Hinatsu, Y; Fujino, T

Magnetic susceptibilities of Y/sub y/U/sub 1-y/O/sub 2 + y/ solid solutions with fluorite structure were measured from 4.2 K to room temperature. For the solid solutions with y values less than 0.50, an antiferromagnetic transition was observed. The Neel temperature decreased with decreasing uranium concentration, but in a different manner from that of (U,Th)O/sub 2/ or (U,Zr)O/sub 2/ solid solutions. The magnetic moment and Weiss constant were determined in the temperature range in which the Curie-Weiss law holds. With decreasing uranium concentration, the magnetic moment decreased more rapidly compared with those for (U,Th)O/sub 2/ and (U,Zr)O/sub 2/ solid solutions. The Weiss constant monotonously decreased with decreasing uranium concentration. The oxidation state of uranium in the solid solutions was discussed by means of the magnetic susceptibility data for specimens with various x and y values. The substitution of Y/sup 3 +/ for U/sup 4 +/ in UO/sub 2/ proved to show the magnetic dilution effect with simultaneous oxidation of U/sup 4 +/ to U/sup 5 +/. The critical concentration for antiferromagnetism, C/sub 0/, for oxygen-stoichiometric solid solutions, (U,Y)O/sub 2.0/ was estimated to be 0.12. The Neel temperature of a hypothetical compound with fluorite structure in which all the cation sites are occupied by the U/sup 5 +/ ions, was estimated to be 15 K.

• Research Organization: Japan Atomic Energy Research Institute, Ibaraki
• OSTI ID: 6633494
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 66:2; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ACTINIDE COMPOUNDS
ANTIFERROMAGNETISM
CHALCOGENIDES
COHERENT SCATTERING
DATA
DIAGRAMS
DIFFRACTION
EXPERIMENTAL DATA
INFORMATION
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MEDIUM TEMPERATURE
NEEL TEMPERATURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
SCATTERING
SOLUBILITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE
URANIUM COMPOUNDS
URANIUM DIOXIDE
URANIUM OXIDES
VERY HIGH TEMPERATURE
VERY LOW TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES