Preparation and Characterization of a Magnetic Binary System Comprise of γ-Fe₂O₃ and α-FeO(OH) Nanoparticles

Abstract:

Magnetic nanoparticles were prepared from a low crystalline ferrihydrite (Fe₅O₇(OH)·4H₂O) precursor by a chemically-induced transformation method using mixed FeCl₂/NaOH solution. The products obtained were characterized using a vibrating sample magnetometer, X-ray diffraction, transmission electron microscopy, and energy dispersive X-ray spectroscopy. Experimental results show that while the concentration of NaOH was 0.17 mol/L, and the FeCl₂ concentration was increased from 0.09 mol/L to 0.42 mol/L in the mixed solution, the as-prepared products were binary nanoparticle systems comprised of ferrimagnetic γ-Fe₂O₃ sphere-type particles and antiferromagnetic α-FeO(OH) rod-type particles. The resulting particles were highly crystalline. The volume ratio of γ-Fe₂O₃ and α-FeO(OH) particles was estimated from magnetization data, which showed that the volume of γ-Fe₂O₃ particles decreased and α-FeO(OH) particles increased with increasing FeCl₂ concentration. Such nanoparticle systems could be suitable for synthesis of binary ferrofluids, which have different behavior to conventional ferrofluids.

• Periodical: Materials Science Forum (Volume 852)
• Pages: 264-271
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.852.264
• Online since: April 2016
• Authors: Xiao Min Gong, Jian Li, Jun Ming Li, Hong Mao
• Keywords: Ferrihydrite, Goethite, Maghemite, Nanoparticle

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