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Characterization of Co-Modified γ-Fe2O3 Based Composite Nanoparticles

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Abstract:

During the synthesis of γ-Fe2O3 nanoparticles using a chemically-induced transition in a FeCl2 solution, Co-surface modification was attempted by adding Co (NO3)2 and NaOH to the solution. The magnetization behaviors, morphologies, crystal structure, and chemical compositions of the as-prepared samples were characterized using vibrating sample magnetometry, transmission electron microscopy, X-ray diffractometry, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The as-prepared particles consisted of γ-Fe2O3/CoFe2O4 composite crystallite and a CoCl2·6H2O coating. The molar, mass and volume ratios of the phases were estimated from the characterization results for each sample. The Co-modified γ-Fe2O3 nanoparticles’ anisotropic constant is approximately 1.48×10-1 J/cm3. Their coercivity depends on the size of composite crystallites, which is based on the γ-Fe2O3/CoFe2O4 content rather than the Co content.

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Periodical:

Key Engineering Materials (Volume 633)

Pages:

11-16

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.633.11

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Online since:

November 2014

Authors:

Jun Ming Li, Jian Li*, Long Long Chen, Xiao Min Gong, Hong Mao

Keywords:

Chemical Synthesis, Co-Modification, Magnetism, γ-Fe2O3 Nanoparticles

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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