Effect of Aluminium Doping on Structural and Magnetic Properties of Ni-Zn Ferrite Nanoparticles

Abstract

Aluminium doped Ni-Zn ferrite nanoparticles of general formula of Ni0.5Zn0.5AlxFe2−xO4 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0) have been synthesized by sol-gel auto combustion method and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), Fourier transform spectroscopy (FTIR) and vibrating sample magneto meter (VSM). XRD studies confirm that all compositions show single phase cubic spinel structure. The crystallite size was calculated using the Debye-Scherrer formula and found in the range of 17 -52 nm. The lattice parameter "a" is found to decrease with increasing Al 3+ content. The SEM images clearly show the crystalline structure and EDX patterns confirm the compositional formation of the synthesized compositions. The results of FTIR analysis indicated that the functional groups of Ni-Zn spinel ferrite were formed during the sol-gel synthesis process. The IR spectra showed two main absorption bands, the high frequency band ν1 around 600 cm −1 and the low frequency band ν2 around 400 cm −1 arising from tetrahedral (A) and octahedral (B) interstitial sites in the spinel lattice. As doping is increased the magnetic behavior is found to decrease and the composition x = 2.0 ferrite appears to be exhibiting superparamagnetism as the coercive field and retentivity are found near zero.

Influence of nickel addition on structural and magnetic properties of aluminium substituted Ni-Zn ferrite nanoparticles

“…Increasing the Ni 2+ ion concentration together with Al 3+ ion substitution considerably lowers the saturation magnetization and leads to superparamagnetic behaviour. In our earlier work, we have observed superparamagnetism for the composition of Ni 0.5 Zn 0.5 Al x Fe 2-x O 4 at x = 2.0 [38].…”

Synthesis, Structural, and Magnetic Properties of Mn0.5Zn0.5Fe2O4Nanoparticles by Sol–Gel Route

“…The powder exhibited clear hysteresis showing typical magnetic behavior, ferromagnetic, having a nonzero coercivity and remanance. It has been observed that narrow hysteresis loops show the characteristic of soft magnetic materials, which has much importance in magnetic memory purposes. From the magnetization data, parameters like saturation magnetization (1.667 emu g −1 ), coercivity (27.253 Oe), remanent magnetization (0.119 emu g −1 ), and squareness ratio (0.0713) are measured.…”

Structural, Williamson-Hall Plot and Size-strain Analysis of MgxNi1-xAlxFe2-xO4 Ferrites

“…The distinct approaches presented in W-H analysis, we assume that size and strain broadening are additive components of the total integral breadth of a Bragg peak [28][29][30]. The distinct angle (θ) dependencies of both effects laid the basis for the separation of size and strain broadening in the analysis of Williamson and Hall [30][31].…”