Mössbauer Effect in Iron-Nitrogen Alloys and Compounds

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Abstract
Mössbauer effects of 57 Fe in iron-nitrogen martensite and its tempering stages were measured. The spectra were resolved into the components corresponding to the 1st, 2nd, 3rd, 4th and farther n n Fe for each interstitial nitrogen atom. The analysis showed the localized perturbations by the nitrogen atoms on a host iron lattice similar to the case of iron-carbon martensite. 2) The principal axis of electric field gradient at the 2nd n n Fe in the α''-Fe 16 N 2 were determined to be directed to the nitrogen atom, not being parallel to the c -axis. The number of s and d electrons for the 1st n n Fe in some iron-nitrogen compounds were determined. The reduction of internal field, larger for interstitial alloys and compounds relative to substitutional ones, was proportional to the coordination number, n , to the neighboring nonmetal atoms. While, the variation of isomer shift depended upon both n and nonmetal concentration c .