The transformation of ferrihydrite into goethite or hematite, revisited

作者: Yannick Cudennec , André Lecerf

DOI: 10.1016/J.JSSC.2005.11.030

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摘要: During the oxidation of iron, poorly crystallized phases are firstly formed: 2-and 6-line ferrihydrite, which presents for the last phase, a similarity with wustite FeO but also with hematite α-Fe2O3. Crystallization increases with time and the solid phase obtained is dependent on temperature and pH. Obviously, high temperature favours the formation of the oxide hematite α-Fe2O3. As for the pH factor, it is more complicated. Low and high values of pH (2–5 and 10–14) favour the formation of goethite α-FeOOH, while obtaining hematite is …

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