Abstract
Iron powders were oxidized in NaOH solutions of 5–25 mol kg−1 at 403–563 K and 5 MPa of oxygen partial pressure. Various types and morphologies of iron compounds such as fine particles of Fe3O4, micaceous α-Fe2O3, and coagulated particles of α-NaFeO2 were formed depending on the experimental conditions. The observed critical concentrations of NaOH above which α-NaFeO2 was formed was in good agreement with those thermodynamically calculated for the hydrolysis equilibrium of α-NaFeO2.
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Uchida, S., Sato, T. & Okuwaki, A. Preparation of micaceous iron oxide by the oxidation of iron with pressurized oxygen in concentrated sodium hydroxide solution at elevated temperatures. J Mater Sci 27, 1332–1336 (1992). https://doi.org/10.1007/BF01142048
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DOI: https://doi.org/10.1007/BF01142048