What is it about?
In recent years, the synthesis and alteration of ferrite nanoparticles have been studied to develop nanomaterials' structural, magnetic, and electrical properties, and construct a material that could be used in a variety of applications, including magnetic fluids, high-density data storage, microwave devices, magnetic cooling, high-frequency magnets
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Why is it important?
The sol-gel auto-combustion method was used to prepare Co1.2Fe1.8O4 nanoferrites. Various characterization techniques such as FT-IR, XRD, FE-SEM EDS, and VSM, were used to examine the effect of calcination temperature on crystallinity, phase structure, morphology, and magnetic properties. The X-ray diffraction analysis and FT-IR showed that all samples exhibited the characteristic behavior of nanoparticle with a single-phase spinel configuration. The hopping length, crystallite size, x-ray density, and lattice parameter were found to be dependent on the thermal treatments. EDS was used to characterize the composition and verify the existence of O, Co, Fe, in all samples. The particle size increases as the calcination increases, as shown by FE-SEM photographs. Magnetization measurement indicated that the highest value of coercivity ሺܪሻǡ saturation magnetization ሺܯ௦ሻ and remanance magnetization ሺܯሻ were obtained at calcining temperatures 500 and 700 Ԩ, respectively. The dielectric constant ሺߝԢሻ and dielectric loss factor ሺߝԢԢሻ and the dielectric loss angle ሺݐ݊ܽߜሻ decreased as frequency rose, then became constant at high frequencies, perhaps due to electron hopping between ferrous (Fe2+) and ferric (Fe3+) ions. At higher frequencies, the values of dielectric loss are low which shows that high-frequency applications might be possible. In all samples, dielectric constant and AC conductivity behave according to Koop's theory, Maxwell-Wagner polarization mechanism, and electrons hopping whereas the conductivity ሺߪሻ increases with an increasing frequency.
Perspectives
In this study, a sol-gel auto combustion method was used to make Co1.2Fe1.8O4 nanoparticles since they are easy to prepare, require short time and do not need high temperatures. We studied the effect of various calcined temperature on structural, magnetic and especially electrical properties due to the applications of this material in high frequencies. The nanoferrites were prepared in the form of powder, and then they were compressed and sintered to take the required shape, and they areconsidered to be one of the easiest and cheapest materials. Several factors affect the properties of ferrite, including the shape of the grains, their size, method of preparation, temperature of sintering, the type of materials that make up ferrites and their quantities
Ali Mohammad
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This page is a summary of: Study of the structural, magnetic and electrical properties of Co1.2Fe1.8O4 nanoferrites, January 2023, American Institute of Physics,
DOI: 10.1063/5.0120098.
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