Transformation of synthetic γ‐FeOOH (lepidocrocite) in aqueous solutions of ferrous sulphate

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Abstract
The course of the transformation of synthetic γ‐FeOOH (lepidocrocite) samples, prepared by different methods was investigated and the effect of a preliminary heat treatment of the initial material on the product phase composition and morphology studied. Both the goethite‐tohematite ratio and the particle size of the products depend on the preparation method and on the preliminary heat treatment of the initial lepidocrocite. The results are discussed in terms of the dissolution of the less stable lepidocrocite followed by the crystallization of the more stable phases α‐FeOOH and α‐Fe2O3 from the solution. The final product phase composition and the particle size are affected considerably by a presence of goethite and/or hematite germs in the initial γ‐FeOOH.

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