Abstract
The mechanochemical synthesis of ultrafine hematite powders via solid-state reactions involving FeCl 3 and CaO or Ca(OH) 2, respectively, has been investigated. Mechanical milling of 2FeCl 3 + 3CaO led to a nanocrystalline mixture of these two compounds. Fe 2O 3 formed only after heat treatment at 150 °C or above. A dilution of CaCl 2 into the starting mixture caused a significant decrease in particle size, resulting in 10–30 nm mono-disperse particles of Fe 2O 3. Nanocrystalline akaganeite, FeOOH, together with calcium chloride was formed by milling 2FeCl 3 + 3Ca(OH) 2. Conversion of FeOOH to Fe 2O 3 by dehydration occurred during subsequent heat treatment. Ultrafine Fe 2O 3 particles of 20–50 nm were obtained after removal of the CaCl 3 by-product phase.
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