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In situ Synthesis of Nickel Ferrite Nanoparticle/organic Hybrid

Published online by Cambridge University Press:  01 June 2005

Satoshi Nakamura ,
Wataru Sakamoto  and
Toshinobu Yogo
Satoshi Nakamura
Affiliation:
Division of Nanomaterials Science, EcoTopia Science Institute, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
Wataru Sakamoto
Affiliation:
Division of Nanomaterials Science, EcoTopia Science Institute, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
Toshinobu Yogo*
Affiliation:
Division of Nanomaterials Science, EcoTopia Science Institute, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
*
a) Address all correspondence to this author. e-mail: yogo@esi.nagoya-u.ac.jp
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Abstract

A NiFe2O4 particle/organic hybrid was synthesized in situ from iron-organic and nickel organic compounds below 100 °C. A mixture of nickel (II) acetylacetonate (NA) and iron (III) 3-allylacetylacetonate (IAA) was hydrolyzed and polymerized yielding spinel oxide particle/oligomer hybrid. X-ray diffraction analysis revealed that the crystallinity of spinel particles was dependent upon the hydrolysis conditions of NA-IAA. Nanocrystalline nickel ferrite particles around 10 nm were uniformly dispersed in the organic matrix. The formation of nickel ferrite was confirmed by energy-dispersive x-ray and x-ray photoelectron spectroscopy. The saturation magnetization of hybrid increased with increasing water amount for hydrolysis. Nano-sized nickel ferrite particle/organic hybrid showed a BH curve with no remanence above 75 K. The magnetization versus H/T curves at 300, 200, and 75 K were superimposed on the same curve and satisfied the Langevin equation. The remanent magnetization and coercive field of the hybrid were 7.4 emu/g and 460 Oe, respectively, at 5 K.

Keywords

CompositeMagnetic propertiesNanoparticle
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 6 , June 2005 , pp. 1590 - 1596
Copyright
Copyright © Materials Research Society 2005

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