Magnetic and crystallographic properties of Sm2Fe17N
x
with x>3.0, nitrogenated by using a mixed gas of NH3 and H2, 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 Th2Zn17 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 Sm2Fe17N3.0. The saturation magnetization increased slightly by the dehydrogenation treatment, although it is still considerably smaller than that of Sm2Fe17N3.0.
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