Oxidation and Disproportionation of Wüstite Studied by Mössbauer Spectroscopy
Authors:
- 1 February 1999
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 38 (2B) , L189
Abstract
Oxidation of wüstite (Fe1-δO) in air and disproportionation into α-Fe and Fe3O4 in a vacuum-sealed tube at temperatures below the transition temperature (843 K) were studied by Mössbauer spectroscopy. The observed discontinuity of weight increase during oxidation in air indicates a two-step process, i.e., the first is the oxidation of Fe1-δO to Fe3O4 and the second, that of Fe3O4 to α-Fe2O3. The change in the fraction of components by annealing in a vacuum-sealed tube depends linearly on the logarithm of the annealing time. The process is interpreted as having a wide distribution of effective thermal activation energy.Keywords
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