Comparison of initial permeability of MgCuZn ferrites sintered by both conventional and microwave methods

Abstract

NiCuZn ferrites are widely employed for many electronic applications, but can be replaced by MgCuZn ferrites owing to their superior properties like low magnetostriction, environmental stability, low stress sensitivity and low cost. In view of this, a series of non-stoichiometric MgCuZn ferrites (Mg0.5−xCuxZn0.5Fe1.9O4−δ with x = 0.0, 0.05, 0.10, 0.15, 0.20, 0.25) have been successfully synthesized by both conventional and microwave sintering techniques. The non-stoichiometry was intentionally introduced into the ferrites to ensure high resistivity of the samples. X-ray diffraction patterns confirm the single phase spinel structure in both cases. The elemental composition of these ferrites was analysed by energy-dispersive x-ray spectrometry. The samples sintered by the microwave technique were found to be denser than the conventionally sintered samples. The initial permeability of MgCuZn ferrites was studied with an increase in copper concentration from x = 0.0 to 0.25. The temperature variation of the initial permeability of these samples was carried out from 30 °C to 150 °C. The results are discussed in the light of microstructure variations of the conventionally and microwave sintered samples. The phenomena involved in microwave sintering are also discussed.

Microstructure and Electromagnetic Properties of Microwave Sintered CoCuZn Ferrites

“…So the microwave sintering technique is expected to prepare the high-permeability Co-Cu-Zn ferrites at relatively low sintering temperatures. The same is reported earlier for other microwave ferrite [12,13]. In this paper, the lowsintering temperature Co-Cu-Zn ferrite, Co 0.35 Cu 0.05 Zn 0.60 Fe 1.98 O 4- , was prepared using microwave sintering technique and the microstructure and electromagnetic properties are investigated and compared with CS samples.…”

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

“…1 shows the experimental settings in the microwave oven. The general configuration of the microwave furnace has been described elsewhere [13]. The green pressed samples were finally sintered at temperatures from 850 to 1000 1C in 25 1C interval and the sintering time was 30 min.…”

“…The surface structure of the samples was observed by the use of a scanning electron microscope (SEM, CRL-ZESIS-EVO-MAI5). The initial permeability (m i ) of the ferrite toroids were evaluated using the standard formula [13] from the inductance measurements carried out at 10 kHz using a computer controlled impedance analyzer (Hioki Model 3532-50 LCR HiTester, Japan). These measurements were carried out in the temperature range 30-200 1C at 10 1C temperature intervals.…”

Structural, magnetic, DC–AC electrical conductivities and thermo electric studies of MgCuZn Ferrites for microinductor applications

“…The objective of the present investigation is to synthesize low-cost ferrite materials for the desired application. So far, several authors investigated and reported on MgCuZn ferrite material with generic formula Mg x Cu 0.5 − x Zn 0.5 Fe 2 O 4 [18][19][20][21][22][23][24][25] by studying the influence of copper on MgCuZn ferrites.…”