Abstract
Octahedral magnetite microcrystals were synthesized through a facile hydrothermal approach at 140 °C using potassium ferrocyanide (K 4Fe(CN) 6) and sodium borohydride (NaBH 4) as starting materials. The structure and morphology of as-prepared particles were characterized by X-ray power diffraction (XRD), Raman spectrum and field emission scanning electron microscopy (FE-SEM). The results showed that magnetite particles, with size ranging from 2 to 5 μm, are octahedral in shape. It is found that the concentrations of NaBH 4 and NaOH have great influences on the formation of octahedral magnetites. Compared with the bulk magnetite and some magnetite nanoparticles, these octahedral microcrystals possessed higher saturation magnetization (102.57 emu/g) and lower coercive field (12.55 Oe). Possible reasons were discussed, based on the morphology, crystallinity and microstructure of the particles.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
