Permeability and magnetic properties of Al3+ substituted Ni0.7Zn0.3Fe2O4 nanoparticles

Abstract

In this work, the structural and magnetic properties of Al3+ substituted Ni-Zn ferrite powders were investigated. Ni0.7Zn0.3AlxFe2−xO4 (where x = 0.0–0.5) powders were obtained by sol-gel auto combustion method. X-ray diffractometer, vibrating sample magnetometer, scanning electron microscopy, infrared spectroscopy, and permeability were used to study the effects of Al3+ ions on the structural and magnetic properties. X-ray patterns reveal that all the samples have single-phase cubic spinel structure. Infrared spectroscopy was used to locate the absorption bands and to study the influence of Al3+ substitution on the spinel structure of the presently investigated system. The lattice constant and x-ray density were calculated from the XRD data. The density of the samples was measured and consequently the porosity was calculated too. Magnetic properties were carried out by means of magnetization measurement to study the magnetic interaction between the ions. This paper is also focused its discussion on the dependence of the permeability spectra with the frequency variation. The permeability and Curie temperature were determined using the temperature dependent permeability measurements.

Preparation and Magnetic Properties of Cu Ni Al Ferrite Nanoparticles and Polypyrrole/Cu0.5Ni0.5Al0.3Fe1.7O4 Composite

“…It is clear that the lattice constant decreases by increasing aluminum concentration as expected because of the difference in the ionic radii of aluminum and iron ions; where larger Fe 3+ (0.645Å) ions have been replaced by smaller Al 3+ (0.55Å) ions; therefore this observed decrease in lattice constant is expected. Similar trend had been observed and reported in other aluminum substituted ferrite systems [25,26].…”

“…The saturation magnetization decreases with the increase in Al content (x), which is quite reasonable due to the substitution of magnetic Fe 3+ ions (5μB) by nonmagnetic Al 3+ ions (0 μB). Also, it can be seen from Table 5 that the coercivity increases slightly upon introducing Al, following an almost similar behavior reported in literature [26].…”

Structural, magnetic and electrical properties in Al-substitued NiZnCo ferrite prepared via the sol–gel auto-combustion method for LTCC technology

“…Similar variation in grain size with the increase of Al sustitution is also obtained in MnZn, Co, Ni, and NiZn ferrite system. [16][17][18][19][20] It is due to small amount of aluminum oxide can be segregated at grain boundaries which inhibits the boundary movement as the second phase particle in the nal sintering stage 20 which can be conrmed by the EDS analysis in the grain interior and grain boundary ( Fig. 3).…”

Alternate current magnetic property characterization of nonstoichiometric zinc ferrite nanocrystals for inductor fabrication via a solution based process

“…26 Also, the insulating layer of organic ligands surrounding the colloidal NCs serve to suppress eddy currents, which are significant sources of energy loss in conventional magnetic materials. Though there are studies that motivate the interest in the magnetic permeability of zinc ferrite NCs, [60][61][62] there has not been a systematic study which addresses both controlled NC size and composition. We use the insights gained to design ac devices based on zinc ferrite NCs operating at radio frequencies.…”