Abstract
We report the first kinetic study of iron oxidation in a mica. Large singly-crystal biotite wafers were heated in air to various temperatures and for various times. Room temperature 57Fe Mössbauer spectroscopy was used to quantify the resulting Fe2+ and Fe3+ amounts. A simple activation model is consistent with the measurements and gives an activation energy of e b = 2.36 eV and an attempt frequency of f 0 = 2.9×107 Hz. We are lead to propose that, iron oxidation and ordinary dehydroxylation have the same rate limiting step: local dissociation of an OH group as OH−→O2-+H+. In oxidation this is followed by Fe2+ +H+→Fe3+H whereas in dehydroxylation it is followed by OH− +H+→H2O.
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Rancourt, D.G., Tume, P. & Lalonde, A.E. Kinetics of the (Fe2++OH−)mica→(Fe3++O2−)mica+H oxidation reaction in bulk single-crystal biotite studied by Mössbauer spectroscopy. Phys Chem Minerals 20, 276–284 (1993). https://doi.org/10.1007/BF00208141
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DOI: https://doi.org/10.1007/BF00208141
