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

Journal Article · Mon Jun 01 04:00:00 EDT 1987 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(87)90311-2· OSTI ID:6297811

Hinatsu, Y; Fujino, T

Magnetic susceptibilities of La/sub y/U/sub 1-y/O/sub 2+x/ solid solutions with fluorite structure were measured from 4.2 K to room temperature. An antiferromagnetic transition was observed for the solid solutions with lanthanum concentration 0 less than or equal to y less than or equal to 0.3 in both stoichiometric (x = 0) and hypostoichiometric oxygen range (x < 0). From comparison of the magnetic properties of solid solutions with different oxygen amounts (x < 0, x = 0, x > 0), both oxygen vacancies and interstitial oxygens were found to weaken the magnetic exchange interactions between uranium ions. The Neel temperature decreased with decreasing uranium concentration. The variation of the Neel temperature of (U, La)O2 solid solutions with uranium concentration was different from that of (U,Th)O2 solid solutions. The magnetic moment decreased with decreasing uranium concentration. It's rate was larger than that of (U, Th)O2 solid solutions and was comparable with that of (U,Y)O2 solid solutions. The oxidation state of uranium in the solid solutions was examined from the magnetic susceptibility data. The uranium ions were found to be in either the tetravalent or the pentavalent state. The effect of magnetic dilution was larger with La2O3 than with Y2O3 and/or Sc2O3.

• Research Organization: Japan Atomic Energy Research Institute, Ibaraki
• OSTI ID: 6297811
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 68:2; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
ACTINIDE COMPOUNDS
CHALCOGENIDES
DATA
DISPERSIONS
EXPERIMENTAL DATA
INFORMATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MIXTURES
NEEL TEMPERATURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SOLID SOLUTIONS
SOLUTIONS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
URANIUM COMPOUNDS
URANIUM OXIDES
VALENCE