Sm₂Fe₁₇N_xの磁気特性

抄録

Sm₂Fe₁₇N_x (x=3) of 95 vol% purity was obtained by nitrogenation of Sm₂Fe₁₇ alloy using a mixed-gas of NH₃ (0.35 atm) and H₂ (0.65 atm). The saturation magnetization, 4πI_s, was 15.5 kG, and the anisotropy field, H_a, was found to be 220 kOe. Aligned powders of Sm₂Fe₁₇N₃ having an aver age grain size of 3 μm showed the (BH)_max, value of 35 MGOe on the assumption that the powder was compressed into full density. The effects of the presence of nonnitrogenated phase and SmFe₃N_y phase on magnetic properties of compressed powder magnets are also discussed.