Abstract

Abstract When magnetites were synthesised by oxidising two-thirds of the iron in a 0.51 m ferrous sulphate solution using potassium nitrate as an oxidising agent, the crystallization of magnetites occurred predominantly at pH 4.5. The presence of phosphate and citrate at a H 2 PO 4 − or citrate: Fe 2+ mole ratio of 0.4 inhibited the nucleation and crystal growth of magnetite. Acetate was ineffective in suppressing the nucleation or crystal growth of magnetite. The magnetite particles were present in a range of sizes and morphologies. The incorporation of small amounts ( 2+ and its ability to exhibit the Jahn-Teller effect and the larger ionic radii of Mn 2+ and Cd 2+ may be responsible for their non-uniform distribution in the magnetite crystals.

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