Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 39, Issue 5, Pages 3139-3141Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2003.816032
Keywords
ferrimagnetic behavior; nanoferrites; NiZn ferrites; sol-gel process
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Nanostructured spinel NiZnCu ferrites were prepared by the sol-gel method from metal nitrate raw materials. Analyses by X-ray diffraction and scanning electron microscopy showed the average particle size of NiZnCu ferrite was under 50 nm. The single phase of NiZnCu ferrites was obtained by firing at 250 degreesC, resulting in nanoparticles exhibiting normal ferrimagnetic behavior. The nanotructured Ni0.2Zn0.8-xCuxFe2O4 (x = 0.2 similar to 0.6) were found to have the cubic spinel structure. NiZn ferrite phase substituted by Cu was obtained before using the additive but hematite phase partially appeared at x = 0.6. On the other hand, the hematite phase in this NiZnCu ferrite disappeared after using the additive of acetyl acetone small amount. The saturation magnetization M-S of Ni0.2Zn0.8-xCuxFe2O4 in this work as measured was about 51 emu/g at 77 K and 19 emu/g at room temperature, respectively.
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