TRANSMISSION MOSSBAUER-SPECTROSCOPY STUDY OF THE SURFACE OF IRON POWDERS - FEASIBILITY AND RESULTS

Transmission Mossbauer spectroscopy has been used to obtain informatio n on structural and chemical conversions in the surface layers during preparation of finely dispersed iron powders by high-temperature reduc tion of alpha-FeOOH. The two-stage technique of preparing Fe-56-based particles with an Fe-57 surface layer makes it possible to obtain high -quality Mossbauer spectra from surface layers 4-5 nm thick on differe nt reduction stages. The investigations performed allowed us to consid er the possibility of studying physicochemical processes in ultrathin surface layers by means of transmission Mossbauer spectroscopy. (C) 19 98 John Wiley & Sons, Ltd.