Abstract
Thermal treatment in air of synthetic ferrihydrite has been carried out at up to 400°C. The product was characterised by means of X-ray powder diffraction, transmission electron microscopy, thermal analysis and nitrogen adsorption isotherms. Three stages may be distinguished during the course of this reaction: 1. (i) original sample (r.t.); mesoporous ferrihydrite with cylindrical shape mesopores and high surface area; 2. (ii) 200°C mesoporous protohematite or pseudohematite with slit-shape mesopres; 3. (iii) 200°C mesoporous hematite with slit-shaped mesopores and significant decrease in suface area as a consequence of internal sintering within the microcrystals increasing its crystallinity as the temperature increases.
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