Hyperfine structure and electrochemical behavior of Fe-Cr-Ni alloys

Abstract

With the use of nuclear γ-resonance Mossbauer spectroscopy, the hyperfine structure of quenched (1100° C, 1 h, water) Fe-∼20% Cr-(9.6, 40.8, 70.7)% Ni alloys is studied. With the Normos program package, the isomer (chemical) shift Γ (mm/s) of the singlet and doublet signals, the half-width Γ (mm/s) of the singlet and doublet spectral components, the area part S (%) of the components in the general spectra, and the probability distribution function of hyperfine magnetic fields P(Heff) are calculated. The effect of nickel on the electron density distribution around 57Fe nuclei is discovered. Novel data on the presence of ferromagnetic phases, their nuclei and clusters in Fe-19.6% Cr-9.6% Ni are obtained. The data of Mossbauer spectroscopy are compared to the anodic polarization curves recorded in a 1 N H 2SO4 solution with the aim to clarify the relation between the electronic structure and electrochemical behavior of alloys