Effect of sintering temperature on structural and magnetic properties of NiCuZn and MgCuZn ferrites

The low temperature microwave sintered NiCuZn and MgCuZn ferrites with compositions Ni 0.35Cu 0.05Zn 0.60Fe 2O 4 and Mg 0.35Cu 0.05Zn 0.60Fe 2O 4 were synthesized by conventional mixed oxide method. NiCuZn and MgCuZn ferrite samples obtained showed better sintered densities at 950 and 900 °C, respec...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2010-10, Vol.322 (19), p.2819-2823
Main Authors: Penchal Reddy, M., Madhuri, W., Venkata Ramana, M., Ramamanohar Reddy, N., Siva Kumar, K.V., Murthy, V.R.K., Siva Kumar, K., Ramakrishna Reddy, R.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Density
Domain effects, magnetization curves, and hysteresis
Exact sciences and technology
Ferrites
Initial permeability
Magnetic anisotropy
Magnetic properties
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects
Magnetostriction
Microwave heating
Microwave sintering
Microwaves
Physics
Saturation (magnetic)
Saturation magnetization
Sintering
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Summary:The low temperature microwave sintered NiCuZn and MgCuZn ferrites with compositions Ni 0.35Cu 0.05Zn 0.60Fe 2O 4 and Mg 0.35Cu 0.05Zn 0.60Fe 2O 4 were synthesized by conventional mixed oxide method. NiCuZn and MgCuZn ferrite samples obtained showed better sintered densities at 950 and 900 °C, respectively. The scanning electron micrographs of both the ferrite samples appear to be very much similar. The magnitude of initial permeability of MgCuZn ferrite samples is found to be obviously higher than those of NiCuZn ferrite samples at all sintering temperatures. This is mainly due to the fact that MgCuZn ferrite has smaller magnetocrystalline anisotropy constant and magnetostrictive constant. NiCuZn ferrites have higher saturation magnetization than MgCuZn ferrites, which is due to the higher magnetic moment of NiCuZn ferrites. Our results indicate that the microwave sintering method seems to be a potential technique in the MLCI technology.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2010.04.036