Figure 2. X-ray diffraction patterns of (A) 4-nm, (B) 8-nm, (C) 12-nm,
(D) 16-nm Fe3O4 nanoparticle assemblies, and (E) ç-Fe2O3 nanoparticle
assembly obtained from the oxidation of a 16-nm Fe3O4 nanoparticle
assembly under oxygen at 250 °C for 2 h, (F) bcc-Fe nanoparticle assembly
obtained from the reduction of a 16-nm Fe3O4 nanoparticle assembly under
Ar + H2 (5%) at 400 °C for 2 h. All samples were deposited on glass
substrates from their hexane dispersions. Diffraction patterns were collected
on a Simens D-500 diffractometer under Co KR radiation (ì )
1.788965 Å)