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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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Synthesis and Characterization of Nanoparticulate Crystallite Cobalt Ferrite for Permanent Magnet Applications

M.A. Ahmed1, N.G. Imam2, M.M. Hefny3, and H.R. Gomaa1

1 Materials Science Lab. (1) Physics Department, Faculty of Science, Cairo University, Giza, Egypt.
2 Experimental Physics Department, Nuclear Research Center, Atomic Energy Authority, 13759, Cairo, Egypt.
3 Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt.

received November 4, 2015, received in revised form December 8, 2015, accepted February 10, 2016

Vol. 7, No. 3, Pages 235-242   DOI: 10.4416/JCST2015-00073

Abstract

Nanoparticulate cobalt ferrite CoFe2O4 (COF) was successfully obtained at relatively low temperature by means of a facile chemical wet method, namely citrate auto-combustion. X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM), Fourier Transform Infrared (FTIR), and Vibrating Sample Magnetometry (VSM) were carried out to study the structural and magnetic properties, respectively. The XRD results confirm the formation of single spinel phase of COF with an average lattice parameter (a) of 8.38 nm. XRD analysis revealed that the crystal size is about 43 nm, which is close to the particle sizes observed from TEM images (45.33 nm). The FTIR measurements between 400 and 4000 cm-1 confirmed the intrinsic cation vibrations of the spinel structure of COF. The experimental results have been explained on the basis of size and surface effects of the nanodimensional crystal of COF. The high coercivity of the prepared nanodimensional COF is the figure of merit for permanent magnets. Dielectric parameters and AC conductivity were measured as a function of temperature (300 – 800) K and frequency starting from 100 kHz up to 5 MHz. The conduction phenomenon was explained on the basis of the electron hopping model.

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Keywords

Nanoparticulate, CoFe2O4, sol-gel precursor, structural, magnetic, dielectric.

References

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