Fig. 1. Scanning electron micrograph (SEM) images of iron oxides. (A) Two-line ferrihydrite, (B) goethite, and (C) lepidocrocite. The scale bar in the SEM images is 200 nm (Clausen and Fabricius, 2000).
Fig. 1. Scanning electron micrograph (SEM) images of iron oxides. (A) Two-line ferrihydrite, (B) goethite, and (C) lepidocrocite. The scale bar in the SEM images is 200 nm (Clausen and Fabricius, 2000).