The formation of magnetite in aqueous solutions containing Fe3+ and Fe2+ ions in 2:1–1:2 ratio and poly(vinyl alcohol) at room temperature has been studied by magnetic susceptibility and optical absorption measurements. It has been found that the yield reaches a maximum after allowing the solutions at pH 10.5 to stand in a sealed state for 24 h. Transmission electron micrographs for their cast films have revealed that colloidal particles with diameters of 40–100 Å form either chain-like or cluster-like agglomerates. The particles have been identified as magnetite crystals by electron diffraction analysis and by direct observation of the crystal lattice structures.
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Yokoi et al. (1990) studied this question.
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