Magnetic properties of Sm2 Co17 and Sm2 CO17 Nx in the Rhombohedral phase

Abstract

The nitrogenation of Sm2 Fe17 is required to raise the Curie temperature above the temperature range in which the magnets will be used. The raising of the Curie temperature is accompanied by beneficial increases in the other magnetic properties. In this study, we investigate whether the same beneficial increases occurs when Sm2 Co17 undergoes nitrogenation. We find that the coercivity is 1.4 kOe, the remanent magnetization is 1.1 KG, and the energy product is 0.24 MGOe after nitrogenation. These magnetic properties of Sm2 Co17 Nx are very low comparing with the other groups and are not as great as Sm2 Fe17. The reason may be that Sm2 Co17 has some impurities due to the preparation, and the Sm2 Co17 Nx is inhomogeneous, due to the nitrogen coming through the powder does not reach equilibrium.