Mِssbauer analysis of the effect of substitutional atoms on the electronic charge distribution in nitrogen and carbon austenites

The isomeric shifts and quadrupole splitting of lines in Mössbauer spectra of alloyed Fe–Mn–N(C), Fe–Mn–Cr–N(C), Fe–Ni–N(C) and Fe–Mn–Cr–Ni–N(C) austenites were analyzed in comparison to binary Fe–N and Fe–C alloys. A change of the s-electron density at the Fe nuclei by N and C nearest neighbours in alloyed austenite is observed in the same way it was established in binary Fe–N and Fe–C alloys. An opposite influence of Mn and Cr atoms on the change of charge density at the Fe nuclei in nitrogen and carbon austenites is shown. The effect of Ni on the s-electron density depends on its concentration. The quadrupole interaction parameter is analyzed. The distortion of the symmetry of the electronic charge distribution near Fe atoms in both nitrogen and carbon austenites upon alloying with Mn, Cr and Ni is less than that caused by C and N nearest neighbours.