Abstract
The three-dimensional particle size of synthesized acicular goethite particles was studied by combining electron microscopy and X-ray diffraction. The two-dimensional projected size (i.e. length and width) increased with increasing ferrous content, increasing oxidation temperature and decreasing rate of aeration. The mean value of the crystallite size ratio D 010 D 110 decreased with decreasing surface area when a small amount of excess alkali was present. This D 010 D 110 change might be attributed to the change in the cross-sectional shape of the goethite particles.
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