INTRINSIC AND HARD MAGNETIC-PROPERTIES OF SM-2(FE1-XALX)(17) NITRIDES

The intrinsic and hard magnetic properties of Sm-2(Fe1-xAlx)(17) nitri des were investigated. The Curie temperature and saturation magnetizat ion decrease linearly with increasing Al concentration, as also does t he anisotropy field at room temperature. The X-ray diffraction pattern s have shown that all the samples exist in a nearly single phase with Th2Zn17-type structure for x up to 0.12. The lattice parameters increa se with the substitution of Al for Fe atoms. The hard magnetic propert ies of the nitrides obtained indicate that the addition of Al has an u nfavorable effect. The onset decomposition temperature of all nitrides derived from the thermomagnetic curves is around 750 K, implying that Al substitution could not improve the thermal stability of 2:17 nitri des.