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Effects of Maganese Impurity on the Crystallographic and Spin-Rotation Transitions in FeS

The effects of manganese ions on the crystallographic and the spin-rotation transitions in iron sulfide have been examined by using Mössbauer spectroscopy in the temperature ranging from 78 to 600 K. The manganese impurity of Mn0.02Fe0.98S is noted to affect both the crystallographic and spin-rotation transitions in the iron sulfide. The impurity of 2% of Mn in FeS causes an increase in the separation between the spin rotation and the α transition temperatures by as much as 20 K compared with that for FeS without the impurity. Both the 1c and the 2c structures coexist in the temperature range between the α transition temperature and approximately 27 K, with a smaller hyperfine field corresponding to the 1c structure. The spin-rotation temperature for Mn0.02Fe0.98S was measured as 366 K, which is 22 K lower than the α transition temperature. For a 2% impurity of Mn in FeS, the Néel temperature is not appreciably affected.