Collect. Czech. Chem. Commun. 1986, 51, 2737-2740

Investigation on mechanochemical dehydration of γ-FeOOH

Dimiter Klissurskia, Vladimír Blaskova, Jan Šubrtb and Karel Bechiněb

a Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1040 Sofia, Bulgaria
b Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 250 68 Řež, Czechoslovakia


The process of mechanochemical dehydration of γ-FeOOH has been investigated. It has been established that grinding of γ-FeOOH leads to its direct transformation into α-Fe2O3. The IR spectroscopy and X-ray phase analyses did not detect γ-Fe2O3 in the dehydration products. During dehydration, α-Fe2O3 with a defective magnetic structure is formed. The smallest size of the hematite particles obtained is 10 nm. The difference between mechanochemical and controlled thermal dehydration of γ-FeOOH is discussed.