Magnetic and structural investigations on substituted Pr/sub 2/CO/sub 17-x/T/sub x/ systems (T=Fe, Mn, Cr, Cu and Al)
Technical Report
·
OSTI ID:6462369
Magnetic and structural characteristics of Pr/sub 2/Co/sub 17/-based ternaries, in which Co is partly replaced by other transition elements, namely Fe, Mn, Cr, Cu and Al, have been investigated. The objective of the work was to explore the possibility of enhancing the anisotropy of Pr/sub 2/Co/sub 17/ to the point that it would be useful for permanent magnet fabrication. X-ray diffraction indicates that all the systems studied occur in the rhombohedral Th2Zn17 structure. The cell constants increase as Fe, Mn, etc., are introduced in the system, which indicates that substitution occurs in the Co sublattice. The Curie temperatures, T/sub c/, decrease monotonically with increasing x in the order Fe < Cu < Mn < Al < Cr. The saturation magnetization, M/sub s/, increases with increasing x for the Fe system with x < or = 8. For x > 8 in the Pr/sub 2/Co/sub 17-x/Fe/sub x/ system and in all other ternary systems studied, M/sub s/, decreases with x, the magnitude of the effect being in the order Cr > Al > Mn > Cu. The rate of decrease is larger than that expected as a simple dilution except for the systems containing Cu. Significant modification of the anisotropy characteristics of PrCo/sub 17/ is observed upon substitution. The planar anisotropy of Pr/sub 2/Co/sub 17/ becomes uniaxial with Fe (x > or = 4) and Mn (x > or = 2) substitutions. With Cr and Al substitutions, the plane-seeking tendency of Pr/sub 2/Co/sub 17/ is significantly weakened.
- Research Organization:
- Carnegie Inst. of Tech., Pittsburgh, PA (USA)
- OSTI ID:
- 6462369
- Report Number(s):
- AD-A-157850/9/XAB
- 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
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
ANISOTROPY
CHROMIUM ADDITIONS
CHROMIUM ALLOYS
COBALT ALLOYS
COPPER ADDITIONS
COPPER ALLOYS
CRYSTAL STRUCTURE
IRON ADDITIONS
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETIZATION
MAGNETS
MANGANESE ADDITIONS
MANGANESE ALLOYS
METALLURGICAL EFFECTS
PERMANENT MAGNETS
PHYSICAL PROPERTIES
PRASEODYMIUM ALLOYS
RARE EARTH ALLOYS
TERNARY ALLOY SYSTEMS
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
ANISOTROPY
CHROMIUM ADDITIONS
CHROMIUM ALLOYS
COBALT ALLOYS
COPPER ADDITIONS
COPPER ALLOYS
CRYSTAL STRUCTURE
IRON ADDITIONS
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETIZATION
MAGNETS
MANGANESE ADDITIONS
MANGANESE ALLOYS
METALLURGICAL EFFECTS
PERMANENT MAGNETS
PHYSICAL PROPERTIES
PRASEODYMIUM ALLOYS
RARE EARTH ALLOYS
TERNARY ALLOY SYSTEMS