1[1]Coey J M D, Sun H. Improved magnetic properties by treatment of iron-based rare earth intermetallic compounds in ammonia. [J]. J M M M 1990, 87: L251.
3[3]Atsusshi awamoto, Takashi Ishikawa et al. Sm2Fe17Nx magnet powder made by reduction and diffusion method [J].IEEE Trans on Magn, 1999, 35(5): 3322.
4[5]Thaddeus B M.Binary Alloy Phase[M].Materials Park,Ohio:ASM, 1990.1773.
