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Mossbauer Spectroscopy, X-ray Diffraction and IR Spectroscopy of Oxide Precipitates Formed from FeSO₄ Solution

S. Musić ; Ruđer Bošković Institute, P. O. Box 1016, 41001 Zagreb, Croatia, Yugoslavia
I. Czako-Nagy ; Laboratory of Nuclear Chemistry, Lorand-Eotvos University, 1088-Budapest, Hungary
S. Popović ; Ruđer Bošković Institute, P. O. Box 1016, 41001 Zagreb, Croatia, Yugoslavia
A. Vertes ; Laboratory of Nuclear Chemistry, Lorand-Eotvos University, 1088-Budapest, Hungary
M. Tonković ; Ruđer Bošković Institute, P. O. Box 1016, 41001 Zagreb, Croatia, Yugoslavia

Sažetak

Iron oxyhydroxides and oxides were precipitated from FeS04
solution at low oxygen content. The composition and structure,
stoichiometry, particle size and nuclear magnetism of the precipitates
were studied using Mossbauer spectroscopy, X-ray diffraction
and IR spectroscopy. The standard iron oxyhydroxides and oxides were also characterized using the same instrumental techniques. The results have indicated a strong dependence of the chemical composition and structure of the precipitates on the [FeS04] i [NaOH] concentration ratio. a-FeOOH of poor crystallinity was isolated at low pH values. a-Fe203 was formed by internal crystallization of a-FeOOH. At 90 aC, a mixture of Fe(OH)2iFe(OHh was transformed, with the time of heating, to nonstoichiometric Fe304, a-FeOOH and further to a-Fe203. Nonstoichiometric Fe304 was the final precipitation product in suspension with the [Fe2+]i [NaOH] stoichiometric ratio. The importance of these results for the corrosion science of steel in the presence of sulfates has been discussed.

Ključne riječi

Hrčak ID:

177269

URI

https://hrcak.srce.hr/177269

Datum izdavanja:

5.11.1986.

Posjeta: 981 *