Structure and Magnetic Properties of Mn-Zn Ferrite Synthesized by Glycine-Nitrate Auto-Combustion Process

Abstract

Manganese-Zinc ferrites belong to the group of soft ferrite materials characterized by high magnetic permeability and low power loses. These materials are mainly used as cores for inductors, transformers, recording heads and noise filters among others. In this study, nanocrystalline Mn-Zn ferrite with the chemical formula Mn1-xZnxFe2O4withx=0.2, 0.4, 0.6, 0.8 has been successfully synthesized by glycine-nitrate auto-combustion process using glycine as a fuel and nitrates as oxidants. The structures and magnetic properties of the resulting powder were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). It is revealed from the XRD pattern than a significant amount nanocrystalline Mn1-xZnxFe2O4ferrite with average crystallite size in the range 43.25-66.7 nm has been formed. The magnetic measurement gives a typical value of saturation magnetic of 34-69 emu/g and coercivity of 40-60 Oe.

A review on MnZn ferrites: Synthesis, characterization and applications

“…SEM is widely used for it but TEM is better than SEM because of poor resolution of SEM. AFM is a technique that can be used in different conditions like air, vacuum, liquid and moist conditions.Winiarska et al [205] observed that the TEM gave core shell type structure formation.Mirsekari et al [204] found from the SEM micrographs that the morphology of MnZn ferrite was porous, sponge like and agglomerated with an average particle size of 2µm. Anwar et al [9] observed from the SEM micrographs that the particles were spherical in shape.Gabal et al [206] studies showed that TEM morphology showed very strong agglomeration of the cubic particles, having some particles in one line.…”

“…Praveena et al [179]observed that the value of saturation magnetization (M s ) increased from 53.33Am 2 /Kg to 78.26Am 2 /Kg with increase in zinc content and then decreased to 10.74Am 2 /kg if zinc content is further increased. From the hysteresis curves Mirsekari et al [204] observed that the saturation magnetization decreased from 69 to 34 emu/g.Gabal et al [186]observed the value saturation magnetization M s increased from 32.9emu/g to 37.6emu/g,then decreasedto 25.9emu/g and again increased to 43.7emu/g.The value of saturation magnetization was found to be 27.7emu/g in Phong [112] experiment showed the properties of superspin glass and supermagnetismbehavior.The study of Zapata [30] showed that the M s value decreased from 36.22emu/g to 30.78emu/g with increase in Zn concentration. This was due to the fact that increased Zn content decreased the ferric ions on the A sites and this reduced the A-B interaction.…”

“…Remanent magnetization is the value of magnetization that remains in the absence of an induced magnetic field. Mirshekari et al [204] studied structural and magnetic properties of Mn-Zn ferrite. From the hysteresis curves, it was observed that remenantmagnetization decreased from 21.25emu/g to 8 emu/g.Syue et al [188] studied magnetic properties of MnZn ferrites and found that the value of remenant magnetization remained in the range 0.769 emu/g to 8.451emu/g and it was observed that it was lowest for pure zinc ferrite and highest for pure manganese ferrite.Praveena [179] studied magnetic properties of MnZn ferrite and found that remenant magnetization showed increase in value from 21.70Am 2 /kg to 29.58Am 2 /kg and then decreased to 4.36Am 2 /kg with increasing x value as described in table 2.Gabal et al [186] showed that the remenant magnetization also increased from 5.5emu/g to 6.7emu/g firstly and then decreased to 3.6emu/g and again increased to 7.3emu/g.…”

“…Praveena et al [179]found the coercivity value varying in the range 0.0149Oe-0.0172Oe for Mn 1-x Zn x Fe 2 O 4 (x=0.0-1.0). From the hysteresis curves Mirsekari et al [204] observed that the coercivity decreased from 60Oe to 45Oe with increasing x from 0.2 to 0.8. The coercivity as calculated by Gabal [186] showed decreasing trend.…”

Studies of the Magnetic Properties and Specific Absorption of Mn0.3Zn0.7Fe2O4 Nanoparticles

“…Among magnetic nanoparticles available, nanosized Mn-Zn ferrite materials not only have unique size-dependent physical and chemical properties compared with their bulk counterparts but have also emerged as potential candidates for hyperthermia application, because of their suitable T C (340 K) and high stability of permeability with temperature and time. 12 Several methods are used to produce Mn-Zn ferrite nanoparticles, [13][14][15][16][17][18][19] the most common being co-precipitation, hydrothermal precipitation, sol-gel synthesis, and combustion synthesis.…”