Magnetic susceptibilities of Ca/sub y/U/sub 1-y/O/sub 2+x/ solid solutions

Journal Article · Wed Jun 01 04:00:00 EDT 1988 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(88)90370-2· OSTI ID:7015302

Hinatsu, Y; Fujino, T

Magnetic susceptibilities of Ca/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 all the solid solutions examined in this study (y less than or equal to 0.33). The Neel temperature of the oxygen-hypostoichiometric solid solutions (x < 0) decreased with increasing calcium concentration, which shows that magnetic dilution proceeds with calcium concentration. The variation of the Neel temperature with uranium concentration was similar to that of (U,Y)O/sub 2/ solid solutions, but different from that of (U,Th)O/sub 2/ solid solutions. The effective magnetic moment decreased with increasing calcium concentration, which indicates the oxidation of uranium in the solid solutions. From the analysis of the magnetic susceptibility data, it was found that the oxidation state of uranium was either tetravalent or pentavalent. The Neel temperature of the hyperstoichiometric solid solutions (x > 0) did not change appreciably with calcium concentrations. From the comparison of the magnetic susceptibility data of the hypostoichiometric solid solutions with those of the hyperstoichiometric solid solutions, the effect of oxygen vacancies is more significant than that of interstitial oxygens on the decrease of magnetic interactions between uranium ions.

• Research Organization: Japan Atomic Energy Research Institute, Ibaraki
• OSTI ID: 7015302
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 74:2; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
ACTINIDE COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ANTIFERROMAGNETISM
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
DATA
DISPERSIONS
EXPERIMENTAL DATA
INFORMATION
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MIXTURES
NEEL TEMPERATURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SOLID SOLUTIONS
SOLUTIONS
STOICHIOMETRY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
URANIUM COMPOUNDS
URANIUM OXIDES