Mossbauer spectroscopic evidence of a IVFe3+ intermediate in the oxidation of Fe(OH)2 to alpha-FeOOH
1991
Cardile, C.M. (Commonwealth Scientific and Industrial Research Organisation, Wembley (Australia). Div. of Mineral Products) | Lewis, D.G. (South Australian Dept. of Agriculture, Glen Osmond. Waite Agricultural Research Inst.)
Under high pH conditions, the Mossbauer spectral parameters indicated that a small IVFe3+ component was initially present, which increased progressively with the oxidation of Fe(OH)2, maximizing with the onset of alpha-FeOOH formation. As alpha-FeOOH formation increased, the IVFe3+ component decreased, with alpha-FeOOH being the final sole phase. It is suggested that at the high pH values used, a component such as Fe(OH)4- may form, and that any Fe3+ produced by the initial oxidation of Fe(OH)2 is exsolved from the solid, then producing Fe(OH)4- until the formation of the more stable alpha-FeOOH begins. No apparent Fe(OH)3 phase was observed, as anticipated.
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