Many different natural structures of iron oxide exist, such as Fe3O4, hematite (α-Fe2O3), maghemite (γ-Fe2O3), martite (Fe2O3), and ferric hydroxide (β-FeOOH).They all exhibit to some extent magnetic properties. The nature of the magnetic particles prepared was determined by XRD. The results obtained with the synthesized magnetic particles together with the standard
XRD spectrogram of synthetic Fe3O4 are shown in Figure 4(a,b), respectively. The synthetic Fe3O4 was obtained with OA, and it was washed with acetone to remove the OA before use.