Characterization and Electromagnetic Studies on NiZn and NiCuZn Ferrites Prepared by Microwave Sintering Technique

Matli Penchal Reddy, Il Gon Kim, Dong Sun Yoo, Wuppati Madhuri, Nagireddy R. Reddy, Kota Venkata Siva Kumar, Rajuru R. Reddy

Department of Materials Science and Nanotechnology, Yogi Vemana University, Kadapa, India.
Department of Physics, Changwon National University, Changwon, South Korea.
Department of Physics, Sri Krishnadevaraya University, Anantapur, India.

DOI: 10.4236/msa.2012.39091                

Abstract

The low-temperature sintered NiZn and NiCuZn ferrites with the composition of Ni_0.40Zn_0.60Fe₂O₄ and Ni_0.35Cu_0.05Zn_0.60 Fe₂O₄ 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.

Keywords

Microwave Sintering; Soft Ferrites; Magnetic Properties; Dielectric Properties

Conflicts of Interest

The authors declare no conflicts of interest.

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