抄録
The formation and magnetic properties of CaCu5, Th2Zn17 and PuNi3 type compounds were investigated for (Fe1-xCox)4.5Al0.5Sm and (Fe1-xCox)4.5Ni0.5Sm alloys rapidly-quenched at various disk velocities ranging from 8.4 to 41.9 m/s. The CaCu5 type (Fe1-xCox)4.5(Al, Ni)0.5Sm compounds were formed in the composition range 0.6≤x≤1.0. The formation range is the same as that without addition of Al and Ni. The different point due to the addition of Al and Ni is that the CaCu5 type compound can be formed at lower disk velocities, indicating the increased stability of the compound. Its unit cell volume does not change with the addition of Al and Ni. On the other hand, the unit cell volume of (Fe1-xCox)17Sm2Alδand (Fe1-xCox)17Sm2Niδ(x≤0.6) compounds increases 2∼4% and 1∼2%, respectively. The particular large increase of the unit cell volume of (Fe1-xCox)17Sm2Alδ is considered to enhance the Curie temperature and the coercivity.
