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

Abstract

The low-temperature sintered NiZn and NiCuZn ferrites with the composition of Ni<sub>0.40</sub>Zn<sub>0.60</sub>Fe<sub>2</sub>O<sub>4</sub> and Ni<sub>0.35</sub>Cu<sub>0.05</sub>Zn<sub>0.60</sub> Fe<sub>2</sub>O<sub>4</sub> 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

Effects of SnO2, WO3, and ZrO2 addition on the magnetic and mechanical properties of NiCuZn ferrites

“…During the past decade, several approaches have been explored to tailor the magnetic properties of NiCuZn or NiZn ferrites and to lower their sintering temperatures, including using a variety of synthesis methods [6][7][8] and sintering conditions [9][10][11], adding dopants, such as SiO 2 , Bi 2 O 3 , La 2 O 3 , CoO, TiO 2 and MnO 2 [1,6,[12][13][14][15][16], and utilizing sintering aids, such as V 2 O 3 , Bi 2 O 3 and CaO-B 2 O 3 -SiO 2 [16][17][18]. These approaches have been mainly aimed at inducing changes in the densification mechanism of the ferrites so as to manipulate their microstructural evolution and grain boundary properties.…”

Effect of Ti<sup>4+</sup> Doping on Structural, Electrical and Magnetic Properties of Ni<sub>0.4</sub>Cu<sub>0.2</sub>Zn<sub>0.4</sub>Fe<sub>2-x</sub>Ti<sub>x</sub>O<sub>4</sub> Ferrites

“…They can be used as inductors, particularly as Multilayer Chip Inductor (MLCI), transformer core, recording heads and storage devices and in diagnosis purposes [1] [2] [3]. They are also attractive in research and technology for their high magnetic permeability, low magnetic losses, lower cost and easy manufacturing process and for superior magnetization properties [4] [5].…”

Structural, magnetic and optical characterization of Ni0.8Zn0.2Fe2O4 nano particles prepared by co-precipitation method

“…Various authors have prepared mixed Ni-Zn ferrites by using different methods, such as combustion method [6] co-precipitation [7], sol-gel [8], solid state reaction [9], microwave sintering [10], citrate precursor [11], polyacrylamide gel [12] and reported various properties of Ni-Zn ferrites.…”