Abstract
Abstract X-ray diffraction and thermogravimetric studies have been carried out on iron precipitates obtained at different time intervals from Fe(II)SO 4 NH 3 O 2 system. Depending on the experimental conditions amorphous and crystalline compounds were obtained. The iron content of the precipitates varied between 19.8 and 68%. The phases identified from X-ray diffractograms were: hematite, goethite and magnetite. Qualitative indication was that the relative growth was in the order: hematite > goethite > magnetite. Thermogravimetric studies showed that for the crystalline precipitates, the weight loss decreased with the increase of precipitation time. In case of amorphous precipitates, the total weight loss (25 to 800°C) passed through a minima for the sample collected at one hour interval. Based on the weight loss from precipitates in different temperature regions, probable nature of compounds has been proposed.
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