CoFe<sub>2</sub>O<sub>4</sub> Nanoparticles Synthesized by Hydro-Thermal Method and Its Magnetic Properties

CHEN Xiao-yun; LI Hua; SU Yue-zeng; HUANG Zi-shan; LIU He-zhou

Materials and Mechanical Engineering > 2011 > 35(7): 88-92.

CHEN Xiao-yun, LI Hua, SU Yue-zeng, HUANG Zi-shan, LIU He-zhou. CoFe₂O₄ Nanoparticles Synthesized by Hydro-Thermal Method and Its Magnetic Properties[J]. Materials and Mechanical Engineering, 2011, 35(7): 88-92.

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CoFe₂O₄ Nanoparticles Synthesized by Hydro-Thermal Method and Its Magnetic Properties

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Received Date: February 11, 2011

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Abstract

Spinel CoFe2O4 nanoparticles were synthesized by hydro-thermal method. The effects of synthetic temperature and Co contents in raw materials on the structure, morphology and magnetic properties of synthetic particles were studied by X-ray diffractometer, field emission scanning electron microscopy, transmission electron microscopy and vibration magnetometer, changing synthetic temperature (140-220 ℃) and Co contents in raw materials, and the effects were explained in mechanism. The results show that the average grain size of CoFe2O4 nanoparticles synthesized by hydro-thermal method was between 30 nm and 40 nm. It was advantageous to raise Co contents in raw materials for removing α-Fe2O3 phase. The saturation magnetization of particles raised continually with the increase of the synthetic temperature and its maximum was 59.694 Am2·kg-1, the coercive force raised first and dropped later and its maximum was 1 273.28 A·m-1.
- hydro-thermal method,
- Co ferrite,
- nanoparticle,
- saturation magnetization,
- coercive force

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CoFe₂O₄ Nanoparticles Synthesized by Hydro-Thermal Method and Its Magnetic Properties