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The magnetocrystalline symmetry and the Curie temperature of six families of quasi-binary rare earth-cobalt-iron intermetallic phases were studied. Investigated were the phases R2(Co1-xFex)17of the light rare-earth elements R = Ce, Pr, Nd, Sm, and Y and also of Ce-rich mischmetal (MM). In the Sm system, the terminal compound Sm2Co17has an easy c axis and the easy-axis symmetry persists up tox ≈ 0.5. The Nd alloys have an easy basal plane for all values of x. In the other systems, small iron substitutions change the easy-plane behavior of the R2Co17to an easy-axis anisotropy. The easy-axis ranges arex ≈ 0.05to 0.45 for Ce,x ≈ 0.2to 0.6 for Pr,x ≈ 0.1to 0.5 for Y, andx ≈ 0.1to 0.45 for MM. The Curie temperatures are high, between 600°C and 940°C, in these ranges. It is concluded that some of the alloys investigated are promising candidate materials for use in improved "rare earth-cobalt" magnets.
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Ray et al. (1972) studied this question.
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