Abstract
Amorphous iron silicates, x Fe 2O 3 · (1 − x) SiO 2 (0.1 ⩽ x ⩽ 0.4), were prepared by calcining alkoxy-derived gels obtained by the hydrolysis of metal alkoxide mixtures. Structural studies based on X-ray diffratometry. Mössbauer effect and infrared spectroscopy indicated that the materials were indeed amorphous up to 500°C in the composition range x ⩽ 0.3 and that the structure is formed by SiOFe bonds. Crystallization took place on calcining the samples with the composition x ⩽ 0.3 above 600°C. Fayalite deposited at 600°C and hematite and α-cristobalite deposited above 700°C. In the case of the composition x = 0.4 the product was amorphous up to 300°C and only hematite was detected above 400°C.
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