Fig. 3
XRD patterns (Co-Kα wavelength) of the final products of the oxidation by air of Fe(OH)2 aqueous suspensions obtained with Cr(III) = 8 at.% for Q ratios equal to 1, 1.136, and 0.88. G are the diffraction peaks of goethite, L those of lepidocrocite and M those of magnetite, denoted with the corresponding Miller index.
