Mossbauer and magnetization studies of nickel ferrite nanoparticles synthesized by the microwave-combustion method
Mahmoud, Mohamed H.
Elshahawy, A. M.
Makhlouf, Salah A.
Hamdeh, Hussein H.
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Mahmoud, Mohamed H.; Elshahawy, A. M.; Makhlouf, Salah A.; Hamdeh, Hussein H. 2013. Mossbauer and magnetization studies of nickel ferrite nanoparticles synthesized by the microwave-combustion method. Journal of Magnetism and Magnetic Materials, v.343:pp.21–26
Nanocrystalline nickel ferrite was synthesized from its stoichiometric metal nitrates and urea mixtures, using a microwave assisted combustion method. The process was a convenient, inexpensive and an efficient method for formation of NiFe2O4 nanomaterials. Effect of urea/metal nitrates ratio on the obtained phases, particle size and magnetic properties has been investigated by various techniques. Saturation magnetization of 50 emu/g was observed at room temperature for larger particles, and it decreases with decreasing particle size. The coercivity attains a maximum value of 170 Oe when the particle size was similar to 20 nm, and decreases with increasing particle size. Mossbauer spectra measured at RT for some representative samples show a combination of ordered and superparamagnetic behavior, whereas those collected at 20 K elucidate the nature of the obtained phases and cation distribution. (C) 2013 Elsevier B.V. All rights reserved.
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