Abstract
Spinel-type Mg0.35Cu0.20Zn0.45Fe1.94O4 ferrites were synthesized by using the solid-state reaction technique. The XRD patterns of the sintered samples indicated the formation of single-phase cubic spinel structure. The apparent density of the sample is found to increase whereas porosity decreases with the increase in sintering time. The grain growth of the samples is enhanced with the increase in sintering time which is attributed to the liquid phase due to CuO during sintering. The initial permeability of the ferrite is found to increase with the increase in sintering time but the resonance frequency shifts towards the lower frequency. This increase in permeability is correlated to the increase of density and the grain size of the sample. The resistivity of the samples decreases with 103/T ensuring the semiconducting nature of the samples. Room temperature DC resistivity and activation energy of the samples decrease what is attributed to the increased Fe2+ ions content with the increase in sintering time. The dielectric constant (e￠) of the samples decreases with increasing frequency whereas e￠ increases as the temperature increases exhibiting normal dielectric behaviour of the magnetic semiconductor ferrite. The observed variation of electrical and dielectric properties is explained on the basis of Fe2+/Fe3+ ionic concentration as well as the electronic hopping frequency between Fe3+ and Fe2+ ions in the present ferrite sample.
Highlights
Spinel ferrites are technologically very important magnetic materials having potential applications and have attracted intense interest in both the fundamental and the applied research points of view
Ajmal et al [2] found that grain size, density and drift mobility increased whereas porosity, dc resistivity and activation energy decreased with the increase in sintering time of Cu0.6Zn0.4Fe2O4 ferrites
The identification of crystallographic structure and determination of lattice constant were performed on an X-ray diffraction (XRD)
Summary
Spinel ferrites are technologically very important magnetic materials having potential applications and have attracted intense interest in both the fundamental and the applied research points of view. Ajmal et al [2] found that grain size, density and drift mobility increased whereas porosity, dc resistivity and activation energy decreased with the increase in sintering time of Cu0.6Zn0.4Fe2O4 ferrites. The electrical transport properties of ferrites are very sensitive to the chemical compositions, sintering temperature, sintering time, type and amount of substitutions. Conductivity in this material occurs essentially via the hopping of electrons between Fe2+ and Fe3+ ions. The effect of sintering time (1 h, 2 h, 3 h, 4 h and 5 h) on the density, microstructure, initial permeability, Curie temperature, resistivity and dielectric constant of Mg0.35Cu0.20Zn0.45Fe1.94O4 ferrites has been investigated
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
