Electrochemical preparation of Fe-Mn alloy film in organic bath

Abstract

Fe-Mn alloy films have been prepared by electrodeposition in an organic bath containing FeCl2+MnCl2 in dimethyl formamide. The electroreduction of Mn(II) was irreversible and the diffusion coefficient of Mn(II) was calculated to be 8.0ױ0-11 m2 s-1 at 298 K. An amorphous film of Fe-Mn was obtained by potentiostatic electrolysis. The Mn content varied from 4.8 at.% to 72.3 at.% with increase in the applied cathodic potential. Scanning electron microscope investigation showed that the deposited film was homogeneous and consisted of spherical particles. Nano-sized pores were observed in the surface of these particles. After heat treatment at 773 K, large crystal grains formed and X-ray diffraction patterns indicate that solid solution of Mn in ?-Fe occurred. The alloying temperature of the Fe-Mn film was determined to be 1013 K using differential thermal analysis.