Al,Ga substitution in RE/sub 2/Fe/sub 17/ (RE = Ce,Pr,Nd): Magnetic behavior of RE/sub 2/Fe/sub 15/(Al,Ga)/sub 2/ alloys
Alloys with the composition RE/sub 2/Fe/sub 17/ and RE/sub 2/Fe/sub 15/X/sub 2/ (X = Al,Ga) have been synthesized by the arc-melting technique followed by an 125-h anneal at 900--1000 /sup 0/C in evacuated silica capsules. The new compound Nd/sub 2/Fe/sub 15/Ga/sub 2/ is unstable below 800 /sup 0/C, and is only obtained by quenching from above 900 /sup 0/C. From x-ray powder diffraction analysis all alloys except Pr/sub 2/ Fe/sub 15/ Ga/sub 2/ were found to crystallize with the hexagonal Th/sub 2/ Zn/sub 17/ type; indications for a preferential occupation of the (6c) sites by the X atoms are small. Substitution of Al, Ga atoms generally leads to a large increase of the Curie temperature and of the magnetocrystalline anisotropy, thereby enhancing the remanence as well as the coercivity. These effects are a consequence of the strongly distance-dependent exchange interactions of the Fe-Fe and Fe-RE coupling mechanisms. As for binary Pr/sub 2/ Fe/sub 17/ , the easy axis of magnetization for Pr/sub 2/ Fe/sub 15/ Al/sub 2/ was found to be in the basal plane.
- Research Organization:
- Institut fuer Physikalische Chemie der Universitaet Wien, A-1090 Wien, Waehringerstrasse 42, Austria
- OSTI ID:
- 6184432
- Journal Information:
- J. Appl. Phys.; (United States), Vol. 65:12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
MAGNETIC PROPERTIES
GALLIUM ALLOYS
IRON ALLOYS
RARE EARTH ALLOYS
ANISOTROPY
CURIE POINT
EXCHANGE INTERACTIONS
HEXAGONAL LATTICES
LOW TEMPERATURE
POWDERS
SQUID DEVICES
SYNTHESIS
TERNARY ALLOY SYSTEMS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
X-RAY DIFFRACTION
ALLOY SYSTEMS
ALLOYS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
INTERACTIONS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
PHYSICAL PROPERTIES
SCATTERING
SUPERCONDUCTING DEVICES
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
360104* - Metals & Alloys- Physical Properties