Preparation of γ-Fe₂O₃/Ni₂O₃/FeCl₃(FeCl₂) Composite Nanoparticles by Hydrothermal Process Useful for Ferrofluids

Figure 1

The magnetization curves of the precursor (a) and the processed sample in 0.25 M (b), 0.50 M (c), and 1.00 M (d) FeCl₂ solution, respectively. The magnetization curve of Ni₂O₃ particles about 1 μm in diameter is shown in the insert. The Ni₂O₃ particles is commercial availability.