Characterization and Electromagnetic Studies on NiZn and NiCuZn Ferrites Prepared by Microwave Sintering Technique
- 1 Department of Physics, Changwon National University, Changwon, South Korea
- 2 Department of Physics, Changwon National University, Changwon, South Korea
- 3 Department of Physics, Changwon National University, Changwon, South Korea
- 4 Department of Physics, Sri Krishnadevaraya University, Anantapur, India
- 5 Department of Materials Science and Nanotechnology, Yogi Vemana University, Kadapa, India
- 6 Department of Physics, Sri Krishnadevaraya University, Anantapur, India
- 7 Department of Physics, Sri Krishnadevaraya University, Anantapur, India
Abstract
The low-temperature sintered NiZn and NiCuZn ferrites with the composition of Ni 0.40 Zn 0.60 Fe 2 O 4 and Ni 0.35 Cu 0.05 Zn 0.60 Fe 2 O 4 were respectively synthesized by the microwave sintering method. These powders were calcined, compacted and sintered at 950℃ for 30 min. X-ray diffraction (XRD) patterns of the samples indicate the formation of single-phase cubic spinel structure. The grain size was estimated from SEM images which increase with CuO addition. The X-ray density is higher than the bulk density in both the ferrites. The temperature variation of the initial permeability of these samples was carried out from 30℃ to 250℃. The NiCuZn ferrite had higher initial permeability than that of the NiZn ferrite, which could be attributed to the microstructure. Saturation magnetization increases from 40 emug/g (NiZn) to 47 emug/g (NiCuZn). The dielectric constant and dielectric loss tangent of NiZn and NiCuZn ferrite samples decreases with increase in frequency exhibiting normal ferrimagnetic behavior. The NiCuZn ferrite had better electro- magnetic properties than the NiZn ferrite.
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