High-Field Magnetization Study of Sm2Fe17Nx and Related Compounds

Magnetic and crystallographic properties of Sm 2 Fe 17 N x with x >3.0, nitrogenated by using a mixed gas of NH 3 and H 2 , have been investigated by comparing the results of two groups of samples: as-nitrogenated samples which contain hydrogen (0.2 to 0.4/f.u.) and annealed samples which are hydrogen-free. The lattice constant c of the Th 2 Zn 17 structure of the hydrogen-free sample is found to be slightly smaller than that of hydrogen-contained sample, the former value, however , being still larger than that of Sm 2 Fe 17 N 3.0 . The saturation magnetization increased slightly by the dehydrogenation treatment, although it is still considerably smaller than that of Sm 2 Fe 17 N 3.0 .