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Preparation of Magnetite Nanoparticles by Thermal Decomposition of Hematite Powder in the Presence of Organic Solvent

Published online by Cambridge University Press:  21 March 2011

Chun-Rong Lin ,
Ray-Kuang Chiang ,
Chih-Jung Chen ,
Hsin-Yi Lai ,
Igor S. Lyubutin  and
Egor A. Alkaev
Chun-Rong Lin
Affiliation:
Department of Mechanical Engineering, Southern Taiwan University, No.1, Nan-Tai Street, Yung-Kang City, Tainan County, 710, Taiwan
Ray-Kuang Chiang
Affiliation:
Department of Electronic Materials, Far East University, No.49, Chung Hua Rd., Hsin-Shih, Tainan County, 744, Taiwan
Chih-Jung Chen
Affiliation:
Department of Mechanical Engineering, National Cheng Kung University, No.1, University Road, Tainan City, 701, Taiwan
Hsin-Yi Lai
Affiliation:
Department of Mechanical Engineering, National Cheng Kung University, No.1, University Road, Tainan City, 701, Taiwan
Igor S. Lyubutin
Affiliation:
Institute of Crystallography, Russian Academy of Sciences, Moscow, 117333, Russian Federation
Egor A. Alkaev
Affiliation:
Institute of Crystallography, Russian Academy of Sciences, Moscow, 117333, Russian Federation
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Abstract

Magnetite nanoparticles have been synthesized by thermal decomposition of hematite (Fe2O3) powder in the presence of high boiling point solvent. The mixture of hematite and 1- octadecene solvent was heated and stirred in nitrogen gas at the temperature of 320 °C for the desired time (∼2 to 28 hrs). The influence of the reaction time on transformation process was analyzed with X-ray diffraction (XRD), Mössbauer spectroscopy (MS), and magnetic measurements. XRD patterns show that the phase of intermediate was composed of spinel phase and corundum phase (α-Fe2O3). The 57Fe Mössbauer spectra show that the spinel phase originated from the magnetite particles. The structure transformation proportion of hematite to magnetite strongly depends on reaction times. After reflux for 28 hrs the hematite-magnetite transformation was complete. The mean crystallite size of pure phase of magnetite particles is about 40 nm. The saturation magnetization increases with the reaction time, which corresponds to an increase of concentration of magnetite in the samples. A pronounced feature of the Hc and σr/σs observed in samples is the steplike change which appears at 125 K and is characteristic of the Verwey transition. The hyperfine parameters of Mössbauer spectrum measured at low temperature also indicate that the Verwey phase transition occurs. In other words, the Verwey transition is an indication that the magnetite particles exactly grew up in the synthesized compounds. This thermal decomposition process provided a method to prepare pure magnetite as well as magnetite/hematite nanocomposites useful for various magnetic applications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 998: Symposium J – Nanoscale Magnetics and Device Applications , 2007 , 998-J08-05
Copyright
Copyright © Materials Research Society 2007

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