Abstract
MnFe2O4 nanoparticles were synthesized by low-power ultrasonic assisted co-precipitation at two different aging times. In order to investigate the effect of ultrasonic waves on phase formation and magnetic properties of Mn ferrite nanoparticles, two other samples were synthesized in the same conditions but in the absence of ultrasonic waves. Structural and morphological properties of the nanoparticles were examined by using X-ray diffraction (XRD) and scanning electron microscope (SEM). The presence of ultrasonic waves through the reaction medium led to form a single phase of MnFe2O4 at 15 min aging time, while this time was insufficient to form a single phase in the absence of ultrasonic waves. At 60 min aging time, the crystallinity of the sample synthesized in the presence of ultrasonic waves was greater and its particle size was bigger than those of the sample synthesized in the absence of ultrasonic waves. The observed results were evaluated from physico-chemical point of view. It was concluded that the ultrasonic waves led to a slower nucleation rate. The magnetic properties of the nanoparticles were examined by permeameter and Faraday-balance equipment. The saturation magnetization of the sample prepared in the presence of ultrasonic waves was enhanced and its Curie temperature was reduced.
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We gratefully acknowledge the helpful guides provided by Dr. A. Zahedi in writing the English text.
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Pourbafarani, S., Mozaffari, M. & Amighian, J. Investigation of Phase Formation and Magnetic Properties of Mn Ferrite Nanoparticles Prepared via Low-Power Ultrasonic Assisted Co-precipitation Method. J Supercond Nov Magn 26, 675–678 (2013). https://doi.org/10.1007/s10948-012-1784-x
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DOI: https://doi.org/10.1007/s10948-012-1784-x