Synthesis and Characterization of CoMn₂O₄ Nanopowders by a Reverse Micelle Processing

Abstract:

CoMn₂O₄ nanoparticles were synthesized by reverse micelle processing from the mixed precursor (consisting of Co (NO₃)₂ ·6H₂O and MnCl₂·4H₂O). The CoMn₂O₄ was prepared by mixing the aqueous solution at a molar ratio of Co : Mn = 1 : 2. The synthesized powders were calcined at 600°C for 2h. The average size and distribution of synthesized powders were in the range of 10-20nm and narrow, respectively. The average size of the synthesized powders increased with increasing water to surfactant molar ratio. The XRD diffraction patterns show that the phase of CoMn₂O₄ was spinel (JCPDS no.77-0471). The synthesized and calcined powders were characterized by thermogravimetry-differential scanning calorimeter (TG-DSC), X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). The magnetic property of the powder was measured by Vibrating Sample Magneto-meter (VSM) at 298K. The effect of synthesis parameter, such as the molar ratio of water to surfactant, is discussed.

• Periodical: Materials Science Forum (Volume 868)
• Pages: 105-110
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.868.105
• Online since: August 2016
• Authors: Dong Sik Bae*
• Keywords: CoMn₂O₄, Reverse Micelle, Spinel Structure

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