Sm-Fe-Co系窒化化合物の磁気特性

抄録

Experiments were carried out to investigate the Co substitution on the magnetic and physical properties of Sm₂Fe₁₇ nitriding compouds. Sm₂(Fe_1-xCo_x)₁₇ nitriding compounds (x=0∼0.3) were prepared by heat treating fine powders of Sm₂(Fe_1-xCo_x)₁₇ alloys in the pressure of 4.9 MPa N₂ gas. From X-ray diffraction patterns, these nitriding compounds were the Th₂Zn₁₇-type structure. Sm₂(Fe_1-xCo_x)₁₇ alloys were observed to absorb the same large amount of nitrogen as Sm₂Fe₁₇ alloy. Curie temperature of these nitriding compounds increases with increasing the Co content, and lattice parameter (a and c) decrease a little. The intrinsic coercivity of 652.5 kA/m (8.20 kOe) and Curie temperature of 556°C were achieved with Sm₂(Fe_0.8Co_0.2)₁₇N_3.1 compounds.