MAGNETIC-PROPERTIES OF SM2(FE1-XCOX)17C AND Y2(FE1-XCOX)17C

The crystallographic structure and magnetic properties of Sm2(Fe1-xCox)17C with x equal to 0.0, 0.1, 0.2, 0.3, 0.4, 0.7, and 1.0, and Y2(Fe1-xCox)17C with x equal to 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, and 1.0 have been investigated. They crystallize in the rhombohedral Th2Zn17-type structure or the hexagonal Th2Ni17-type structure. The Curie temperatures increase with increasing cobalt content and the saturation magnetizations reach a maximum at x = 0.3. All Sm2(Fe1-xCox)17C compounds have an easy axis, but the anisotropy fields have a dependence on cobalt content. Both Y2Fe17C and Y2Co17C have an easy plane. However, an easy axis is found in a concentration range with 0.4 < x < 0.9 for the substituted Y2(Fe1-xCox)17C compounds.