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No.3(pp.119-150)

Home > Issues > Volume 11 (2006) > No.3(pp.119-150)

Properties of Co-Ferrite Nanoparticles Synthesized by Thermal Decomposition Method

Journal of Magnetics, Volume 11, Number 3, 30 Sep 2006, Pages 123-125

Young-Woo Oh*

(Dept. of Advanced Materials Engineering, Kyungnam University), J. P. Liu(Department of Physics, University of Texas at Arlington)

Abstract

Co-ferrite nanoparticles have been synthesized by the decomposition of iron(III) acetylacetonate, Fe(acac)₃ and Co acetylacetonate, Co(acac)₂ in benzyl/phenyl ether in the presence of oleic acid and oleyl amine at the refluxingtemperature of 295℃/265℃ for 30min. before cooling to room temperature. Particle diameter detected by PSA can be turned from 4 nm to 20 nm by seed-mediated growth and reaction conditions. Structural and magneticcharacterization of Co-ferrite were measured by use of HRTEM, SAED (selected area electron diffraction), XRD and SQUID. The as-synthesized Co-ferrite nanoparticles have a cubic spinel structure and coercivity of 20 nm CoFe₂O₄ nanoparticles reached 1 kOe at room temperature and 18 kOe at 10 K.

Keywords: Co-ferrite nanoparticles; coercivity; seed-mediated growth; forming gas

DOI:

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