Hydrothermal preparation of high saturation magnetization and coercivity cobalt ferrite nanocrystals without subsequent calcination

Huang, N.M. and Goh, S.C. and Chia, C.H. and Zakaria, S. and Yusoff, M. and Haw, C.Y. and Ahmadi, S.H and Lim, H.N. (2010) Hydrothermal preparation of high saturation magnetization and coercivity cobalt ferrite nanocrystals without subsequent calcination. Materials Chemistry and Physics, 120 (1). pp. 31-35. ISSN 0254-0584, DOI https://doi.org/10.1016/j.matchemphys.2009.10.016.

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In this work, CoFe 2O 4 nanocrystals with high saturation magnetization (M s) and high coercivity (H c) have been fabricated via a simple hydrothermal method and without subsequent calcination. The resulting CoFe 2O 4 nanocrystals are characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray spectrometry, differential scanning calorimetry and vibrating sample magnetometry. The results indicate that CoFe 2O 4 nanocrystals are single crystal and the average crystallite size is increasing with the hydrothermal temperature. The electron micrographs show that the nanocrystals are well-dispersed and possess uniform size. The shape of CoFe 2O 4 nanocrystals is transformed from spherical into rod by increasing the hydrothermal temperature. The nanocrystals show relatively high M s of 74.8 emu g -1 and H c of 2216 Oe, as compared to previous reported results. The obtained results reveal the applicability of this method for efficiently producing well crystallized and relatively high magnetic properties CoFe 2O 4 nanocrystals as compared to other methods. More importantly, it does not require further calcination processes. © 2009 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Chemical synthesis Magnetic materials Magnetic properties Nanostructures Cobalt ferrites Coercivities Electron micrograph Energy dispersive x-ray High coercivity High-saturation magnetization Hydrothermal methods Hydrothermal preparation Hydrothermal temperature Transmission electron Uniform size Vibrating sample magnetometry Well-dispersed Calcination Cobalt Coercive force Crystallite size Differential scanning calorimetry Ferrites Magnetic devices Magnetism Materials properties Nanocrystals Scanning electron microscopy Single crystals Synthesis (chemical) Transmission electron microscopy Saturation magnetization
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: miss munirah saadom
Date Deposited: 01 Apr 2013 02:22
Last Modified: 13 Mar 2019 03:54
URI: http://eprints.um.edu.my/id/eprint/5304

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