Mechanism of phase transformations γ and δ-FeOOH during heat treatment in solutions MeOH (Ме - Na, K): model of crystal-forming complexes

Transformations of nanodispersed ferrum (III) oxy hydroxides of γ- and δ-modifications at heat treatment in the open air (temperature interval 25-900°С) as well as at hydrothermal treatment (175-220 °С) in water and water solutions MeOH (Me - Na, K) with concentration 1 ≤ С МеOН ≤ 5 mole/dm 3 are studied by methods of X-ray phase analysis, raster and transmission electronic microscopy, thermogravimetry, masspectroscopy and X-ray fluorescence analysis. Spheres of phases α-FeOOH и α-Fe 2O 3 formation are specified. Possible structure of crystal-forming complexes formed in solutions and reactions running during their fusion in different atomically rough planes α-FeOOH and α-Fe 2O 3 is considered. In terms of a model of crystal-forming complexes experimentally stated dependencies crystal habits as well as phase and disperse structure of formed products on parameters of hydrothermal treatment are explained.