Fe-57 Mossbauer measurements have been performed for two kinds of new
Fe nitrides that contain nearly 50% N in order to clarify their magnet
ic properties. The ZnS-type Fe nitride is found to be a non-magnetic s
ubstance in which Fe atoms have no local magnetic moments. The NaCl-ty
pe Fe nitride is an antiferromagnet and shows rather large hyperfine m
agnetic fields of 49 and 30 T at 4.2 K.