Synthesis of Nanocrystalline Cobalt Ferrite by the Sonochemical Method in Highly Basic Aqueous Solution

Abstract:

This study reported the preparation of nanocrystalline CoFe₂O₄ in single step by the sonochemical method in highly basic aqueous solution without requiring of high temperature calcination process. To prepare nanocrystalline CoFe₂O₄, the mixed solution of the required molar ratio of cobalt nitrate hexahydrate (Co (NO₃).6H₂O) and ferric nitrate nonahydrate (Fe (NO₃).9H₂O) was precipitated in high concentration of sodium hydroxide medium solution (NaOH) under high intensity ultrasonic irradiation (20 kHz, 150 W/cm²). The effect of NaOH concentration (5, 10, 15 and 20 M) on phase formation, microstructure and magnetic property of CoFe₂O₄ was investigated. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA) results showed that the as-prepared powders were single phase CoFe₂O₄ with cubic spinel structure. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) study showed that nanocrystalline CoFe₂O₄ had monosized distorted spherical morphology and an agglomeration of the nanocrystalline CoFe₂O₄ into nanoparticles was observed when increasing the NaOH concentration. The nanocrystalline CoFe₂O₄ exhibited superparamagnetic property and the saturation magnetization (M_s) obtained from vibrating sample magnetometry (VSM) was found to correlate with the crystallite size and varied from 39-45 emu/g_.

• Periodical: Key Engineering Materials (Volume 751)
• Pages: 368-373
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.751.368
• Online since: August 2017
• Authors: Patchara Pasupong, Kittisak Choojun, Naratip Vittayakorn, Panpailin Seeharaj*
• Keywords: Cobalt Ferrite, Magnetic Property, Nanocrystalline Materials, Sonochemical Method

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