Structural, dielectric and low temperature magnetic response of Zn doped cobalt ferrite nanoparticles

Abstract

The finely controlled nanostructured cubic spinel ferrites pave the way to synthesize nanomaterials with specific properties for particular applications. In this paper, we report sol-gel synthesis of Zn doped spinel Co1-xZnxFe2O4 (where x= 0.0, 0.1, 0.2, and 0.3) ferrite nanoparticles. X-ray diffraction confirms the single phase cubic structure of nano ferrites with average particle size estimated between 55.38 to 32.87 nm and validated by Transmission electron microscopy (TEM) results (±1). The lattice parameter was found to increase with increasing Zn doping concentration. The samples exhibit normal dielectric behaviour of Maxwell-Wagner type of interfacial polarization that decreases with increasing frequency of the applied field. Temperature-dependent magnetic properties were investigated with the aid of physical property system. The hysteresis measurements of the samples show clearly enhancement in magnetic parameters as the temperature goes down to 20 K. Tuning of magnetic properties has been witnessed as a function of doping and temperature under the influence of externally applied magnetic field, has been discussed in this paper.

Synthesis of nanosized nickel zinc ferrite using electric arc furnace dust and ferrous pickle liquor

“…The theoretical XRD density ρ x was calculated using the formula 20 , 21 . where M is NZF samples molecular weight, A N is Avogadro’s number (mol −1 ) and V is the lattice volume.…”

Tuning of Structural, Dielectric, and Electronic Properties of Cu Doped Co–Zn Ferrite Nanoparticles for Multilayer Inductor Chip Applications

“…When copper concertation reaches x = 0.15, copper ions with lower magnetic moment concentrations increase in both tetrahedral and octahedral sites and decrease the saturation of magnetization. The net magnetic moment given in Table 3 was calculated using the given formula: The incorporation of Cu 2+ in the lattice of Co-Zn ferrite introduces the change in coercivity and magnetic anisotropic constant (K), which is listed in Table 3 and was calculated using the given equation [54]:…”

“…The decrease in coercivity is a result of the change in the magnetic anisotropic constant, which can be due to lower magneto anisotropy of Cu 2+ ions [55]. However, when x = 0.1, the copper ion present in the tetrahedral site has the lowest coercivity and highest value of magnetocrystalline anisotropy constant, which may be attributed to Jahn-Teller distortions induced by Cu 2+ ions in the spinel ferrite system [52,54,56]. The squareness ratio (SQR) was calculated using the given formula [57]:…”

Photocatalytic Degradation Properties of Li‐Cr Ions Substituted CoFe2O4 Nanoparticles for Wastewater Treatment Application

“…The magnetic study shows that all the samples exhibit ferromagnetic ordering confirmed by the presence of an ‘S’‐shaped loop. [ 66 ] The net magnetic moment of the samples was calculated by the formula. [ 67 ] where is the magnetic moment per formula unit, M w is the molecular weight of the sample, and M s is the saturation magnetization.…”