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A series of experiments has been carried out to investigate the possible formation of magnetite, Fe304, under ambient soil-forming conditions. Rapid and easy synthesis of magnetite was achieved through controlled oxidation of Fe 2+ solutions at room temperatures and near neutral pH values. The synthetic products were found to range in size between 0-01-0.07 #m (mean diameter) and hence span the theoretical superparamagneticsingle-domain grain-size boundary.

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