Nanoparticles CrxAl0.5-xCoFe1.5O4(x = 0.1, 0.25 and 0.4) spinel ferrites were synthesized by coprecipitation technique, aiming to study the relationship between cation distribution of the substitution of chromium and aluminum ions on the structure, morphology, magnetic properties, permeability, Curie temperature andAC loss. X-ray diffraction (XRD) analysis used with Rietveld refinement revealed nanocrystalline single-phase of the spinel ferrites. The calculated average crystallite size is between 40 and 45 nm. The obtained results show, that both lattice constant and total porosity increased by increasing Cr3+concentration. It was found that Al3+ occupied tetrahedral (A) and octahedral (B) sites whereas, Cr3+preferred to occupy only octahedral (B) sites. The magnetizationMs, coercivityHc and the magneto-crystalline constant k1 decreased with increasing Cr3+content. Likewise, Curie temperature TC decreased from 670 Kto 585 Kwith increasing Cr3+concentration. Magnetic loss has further been observed and increased with increasing Cr3+concentration in all investigated samples.
Cr3+substituted aluminum cobalt ferrite nanoparticles: Influence of cation distribution on structural and magnetic properties
Mattei G.;Scian C.;Elsayed H.;
2021
Abstract
Nanoparticles CrxAl0.5-xCoFe1.5O4(x = 0.1, 0.25 and 0.4) spinel ferrites were synthesized by coprecipitation technique, aiming to study the relationship between cation distribution of the substitution of chromium and aluminum ions on the structure, morphology, magnetic properties, permeability, Curie temperature andAC loss. X-ray diffraction (XRD) analysis used with Rietveld refinement revealed nanocrystalline single-phase of the spinel ferrites. The calculated average crystallite size is between 40 and 45 nm. The obtained results show, that both lattice constant and total porosity increased by increasing Cr3+concentration. It was found that Al3+ occupied tetrahedral (A) and octahedral (B) sites whereas, Cr3+preferred to occupy only octahedral (B) sites. The magnetizationMs, coercivityHc and the magneto-crystalline constant k1 decreased with increasing Cr3+content. Likewise, Curie temperature TC decreased from 670 Kto 585 Kwith increasing Cr3+concentration. Magnetic loss has further been observed and increased with increasing Cr3+concentration in all investigated samples.Pubblicazioni consigliate
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