Structure and magnetic properties of nickel ferrites synthesized by a facile co-precipitation method: effect of the Fe/Ni ratio
| Autor: | Charafeddine Sedrati, Safia Alleg, Abdelwahhab Bendali Hacine, Hacen Boussafel |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Rietveld refinement Spinel Analytical chemistry chemistry.chemical_element Coercivity engineering.material Condensed Matter Physics Atomic and Molecular Physics and Optics Nanocrystalline material Electronic Optical and Magnetic Materials Nickel symbols.namesake Lattice constant chemistry engineering symbols Crystallite Electrical and Electronic Engineering Raman spectroscopy |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 32:24548-24559 |
| ISSN: | 1573-482X 0957-4522 |
| Popis: | Nanocrystalline nickel-deficient ferrites have been prepared by a facile co-precipitation method using different Fe/Ni ratios. The obtained powders were studied by X-ray diffraction (XRD), scanning electron microscopy equipped with energy-dispersive X-ray spectrometry, Raman spectrometry, and vibrating sample magnetometer. The XRD results reveal the formation of a nonstoichiometric NiFe2O4-type spinel structure with a lattice parameter in the range of 8.353–8.364 A and an average crystallite size that varies between 51 and 64 nm. The Rietveld refinement shows that the Fe/Ni ratio increases with the increase in Fe content and the obtained structures are nickel-deficient ferrites. Five characteristic vibration modes of the spinel structures have been observed in the Raman spectra. The saturation magnetization values are in the range of 40.14–69.29 emu/g and the coercivity lies between 185 and 200 Oe. According to the Mr/Ms squareness ratio values (0.239–0.265), the spinel ferrites fall into the pseudo-single domain. |
| Databáze: | OpenAIRE |
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