angles, and additional small peaks appear at lower angles. All peak
positions and relative intensities match well with those of commercial
ç-Fe2O3 powder materials (Aldrich catalog No. 48,066-5),
indicating that the oxidation of Fe3O4 under O2 leads to ç-Fe2O3.
Accordingly, due to the oxidation, the saturation magnetization (ós)
of the assembly is reduced from 82 emu/g to 70 emu/g (300 K).17
After annealing under Ar + 5% H2 at 400 °C, the Fe3O4
nanoparticle assembly is reduced to bcc-Fe nanoparticle assembly,
as confirmed by XRD shown in Figure 2F. The reduction leads to
the drastic increase in ós to 186 emu/g, a value close to 210 emu/g
of bulk Fe. Magnetic measurements show that all as-synthesized
Fe3O4 nanoparticles are superparamagnetic at room temperature.17
angles, and additional small peaks appear at lower angles. All peakpositions and relative intensities match well with those of commercialç-Fe2O3 powder materials (Aldrich catalog No. 48,066-5),indicating that the oxidation of Fe3O4 under O2 leads to ç-Fe2O3.Accordingly, due to the oxidation, the saturation magnetization (ós)of the assembly is reduced from 82 emu/g to 70 emu/g (300 K).17After annealing under Ar + 5% H2 at 400 °C, the Fe3O4nanoparticle assembly is reduced to bcc-Fe nanoparticle assembly,as confirmed by XRD shown in Figure 2F. The reduction leads tothe drastic increase in ós to 186 emu/g, a value close to 210 emu/gof bulk Fe. Magnetic measurements show that all as-synthesizedFe3O4 nanoparticles are superparamagnetic at room temperature.17
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