Abstract
Abstract The formation of α-Fe 2 O 3 particles by forced hydrolysis of partially neutralized FeCl 3 solutions with tetramethylammonium hydroxide (TMAH) was investigated. The effect of full neutralization of FeCl 3 solution with TMAH on the phase composition of the precipitate was also monitored At low pH values the hydrolytical product was β-FeOOH which transformed to α-Fe 2 O 3 . The shape of the FT-IR spectrum of α-Fe 2 O 3 depended on the size and morphology of the particles. The presence of polycrystalline particles, consisting of much smaller oriented α-Fe 2 O 3 crystallites, was considered. The surface magnetism and magnetic coupling between these crystallites was supposed to be responsible for the inner broadening of the Mossbauer spectroscopic lines. In alkaline medium (pH ~ 11), a mixture of α-FeOOH and α-Fe 2 O 3 was obtained. α-FeOOH and α-Fe 2 O 3 obtained at high pH showed pronounced intraparticle porosity.
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