Thermal behavior in air of iron oxyhydroxides obtained from the method of homogeneous precipitation. Part I. Goethite samples of varying crystallinity
Thermal behavior in air of iron oxyhydroxides obtained from the method of homogeneous precipitation. Part I. Goethite samples of varying crystallinity
Differential scanning calorimetry (DSC), thermogravimetry (TG) together with X-ray diffraction (XRD) and transmission electron microscopy (TEM) have been employed to follow the structural and morphological changes in the thermal decomposition in air of goethite (α-FeOOH) samples of varying crystallinity. A clear relationship is noted between the starting goethite and hematite crystallinities. In the 280-600 °C temperature range, the acicular hematite shows a nonuniform broadening process of the (104) and (110) X-ray lines, this process increased as the starting goethite crystallinity increased. Between 600 and 700 ° C a marked increase of the hematite crystallinity was observed, together with a change of acicular to spherical hematite particles.
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