Title :
Effect of nitrogen content on magnetic properties of Sm2Fe17Nx (0<x<6)
Author :
Iriyama, T. ; Kobayashi, K. ; Imaoka, N. ; Fukuda, T. ; Kato, H. ; Nakagawa, Y.
Author_Institution :
Asahi Chem. Ind. Co., Ltd., Fuji, Japan
fDate :
9/1/1992 12:00:00 AM
Abstract :
Effects of nitrogen content on crystal structure and magnetic properties have been investigated in Sm2Fe17Nx. Sm2Fe17Nx specimens with 0<x<6 were prepared by nitrogenation of Sm2Fe 17 in a mixed-gas atmosphere of NH3 and H2 . All of these specimens were confirmed to have the same crystal structure as Sm2Fe17, although they did not always consist of the single phase. Both saturation magnetization 4πI s and anisotropy field Ha took maximum values at x=3.0 (4πIs=15.7 kG, Ha= 260 kOe). Large coercivity was observed in the specimens of fine-grain powders. Anisotropic powder magnets were fabricated by aligning and compacting the fine-grain powders; the highest value of (BH)max was 21 MGOe for x=3.0
Keywords :
coercive force; crystal atomic structure of alloys; ferromagnetic properties of substances; iron alloys; magnetic anisotropy; magnetisation; nitridation; permanent magnets; powder metallurgy; samarium alloys; NH3-H2; Sm2Fe17Nx; anisotropic powder magnets; anisotropy field; coercivity; crystal structure; fine-grain powders; magnetic properties; maximum energy product; mixed-gas atmosphere; nitrogenation; saturation magnetization; Atmosphere; Coercive force; Hydrogen; Iron; Magnetic materials; Magnetic properties; Nitrogen; Powders; Samarium; Saturation magnetization;
Journal_Title :
Magnetics, IEEE Transactions on
