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Phase stability and magnetic properties of UAl/sub 2/ based pseudobinary spin fluctuation compounds

Technical Report ·
OSTI ID:6026292
The compound UAl/sub 2/ is thought to exhibit ferromagnetic spin fluctuations. The phase stability, magnetic susceptibility, specific heat, and electrical resistivity of UAl/sub 2/ with various atoms substituted for U have been studied. The U/sub 1-x/La/sub x/Al/sub 2/, U/sub 1-x/Lu/sub x/Al/sub 2/, and U/sub 1-x/Ce/sub x/Al/sub 2/ pseudobinary systems were found to have miscibility gaps. These gaps are not related to a size effect and thus must be related to the type of chemical bonding in these alloys. A simple model explaining the position of the miscibility gap edge is proposed. The magnetic susceptibility, chi, of alloys formed by substituting La or Y for U in UAl/sub 2/, was found to rise quite rapidly with the concentration of atomic substituent. Substitutions of Sc, Zr, Ce, and Lu were found to have a much smaller effect on chi. It is concluded that it is the chemical bonding rather than any size or statistical dilution effect that is responsible for these differences. It was found that the low temperature upturn in the specific heat, plotted as C/T vs T/sup 2/, caused by spin fluctuations was not suppressed by alloying in the U/sub 1-x/La/sub x/Al/sub 2/ system, while the Stoner enhancement factor and the electronic density of states were found to rise quickly with x in these alloys. The electrical resistivities of these pseudobinary alloys were studied. The residual resistivities of these alloys rose quite rapidly with atomic substitutions. The electrical resistance at high pressures and low temperature was studied for both UAl/sub 2/ and UPt/sub 3/ (UPt/sub 3/ is also a spin fluctuator). An analysis that allows an inference of the pressure dependence of the chi from the pressure dependence of the resistance is presented. 79 references, 44 figures, 2 tables.
Research Organization:
Los Alamos National Lab., NM (USA)
DOE Contract Number:
W-7405-ENG-36
OSTI ID:
6026292
Report Number(s):
LA-10199-T; ON: DE85005317
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE ALLOYS
ALLOYS
ALUMINIUM ALLOYS
CERIUM ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
INTERMETALLIC COMPOUNDS
LANTHANUM ALLOYS
LUTETIUM ALLOYS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
PHASE STABILITY
PHYSICAL PROPERTIES
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
PRESSURE DEPENDENCE
RARE EARTH ALLOYS
SCANDIUM ALLOYS
SPECIFIC HEAT
STABILITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
URANIUM ALLOYS
YTTRIUM ALLOYS
ZIRCONIUM ALLOYS