EfFect of fe substitution on the magnetic characteristics of some RNI/sub 5/ alloys (r = Pr aNd nd)
The magnetic properties of PrNi/sub 4/Fe and NdNi/sub 4/Fe were studied at temperatures ranging from 4 to 300 K and at field strengths up to 21 kOe. Replacement of 20% of the Ni by Fe in PrNi/sub 5/ and NdNi/sub 5/ expands the lattice and produces a significant alteration in magnetic behavior. PrNi/sub 5/ is a Van Vleck paramagnet and NdNi/sub 5/ is a weak ferromagnet, Curie temperature = 13 K. In contrast, PrNi/sub 4/Fe and NdNi/sub 4/Fe are found to develop ferromagnetic order at low temperatures with Curie temperatures of 230 and 285 K, respectively. Saturation magnetizations at 4.2 K are found to be 7.0 and 7.3 ..mu../sub B/ per formula unit for PrNi/sub 4/Fe and NdNi/sub 4/Fe, respectively. The magnetic behavior of these systems indicates that Fe induces a moment on the neighboring Ni atoms of about 0.65 ..mu../sub B/Ni atom. The magnetization-temperature plots obtained for both systems below the Curie point, at 4 kOe applied field, show maxima. The maxima disappear in an applied field of 21 kOe, and hence they are attributed to the increased magnetic hardness at low temperatures.
- Research Organization:
- Pittsburgh Univ., PA (USA)
- OSTI ID:
- 6324475
- Report Number(s):
- AD-A-157882/2/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ATOMS
FERROMAGNETIC MATERIALS
HARDNESS
IRON ADDITIONS
IRON ALLOYS
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MATERIALS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
NEODYMIUM ALLOYS
NICKEL ALLOYS
PERMEABILITY
PHYSICAL PROPERTIES
PRASEODYMIUM ALLOYS
RARE EARTH ALLOYS