Abstract
Acicular α-FeOOH particles with a particle length of about 0.35 μm and an axial ratio of about 7 were synthesized by the coprecipitation method using the reaction of FeCl2-NaOH. The (Co, Zn)-modified γ-F2O3 particles were produced by absorbing Co2+ and Zn2+ ions on the surfaces of α-FeOOH particles followed by dehydration, reduction and oxidation. The saturation magnetization and thermal stability of the coercivity of (Co, Zn)-γ-Fe2O3 particles were all higher than those of Co-γ-F2O3 particles. For the same (Co+Zn) content, the saturation magnetization of (Co, Zn)-γ-Fe2O3 particles increased with increasing zinc content but the coercivity decreased.
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