Abstract
The low-temperature sintered NiZn and NiCuZn ferrites with the composition of Ni0.40Zn0.60Fe2O4 and Ni0.35Cu0.05Zn0.60 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.
Highlights
The use of microwave radiation in the processing of various ceramic materials such as dielectric, magnetic, superconducting, polymer and other composite materials offers several advantages over conventional processing alternatives
The low-temperature sintered NiZn and NiCuZn ferrites with the composition of Ni0.40Zn0.60Fe2O4 and Ni0.35Cu0.05Zn0.60 Fe2O4 were respectively synthesized by the microwave sintering method
The NiCuZn ferrite had higher initial permeability than that of the NiZn ferrite, which could be attributed to the microstructure
Summary
The use of microwave radiation in the processing of various ceramic materials such as dielectric, magnetic, superconducting, polymer and other composite materials offers several advantages over conventional processing alternatives. The unique and potential benefits that microwave energy can provide over conventional methods such as rapid, internal and selective heating have stimulated much interest in many researchers to apply this technique in ceramic processing such as firing, annealing and sintering. The volumetric heating is one of the possible reasons for improvement in microstructure and the dielectric and magnetic properties of the materials [1,2]. Characterization and Electromagnetic Studies on NiZn and NiCuZn Ferrites Prepared by Microwave Sintering Technique 629 preparing process and the low-temperature sintered NiZn and NiCuZn ferrites, and compared their sintering density, microstructures, magnetic and electric properties
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