Synthesis of Ni_0.5Co_0.5Fe₂O₄ Ferrite and Effect of Annealing Temperature on the Structural, Morphological and Dielectric Analysis

Abstract

In the current work, we have synthesized nickel substituted cobalt ferrite nanoparticles using Pechini's method. The presence of single-phase synthesized nanoparticle is confirmed at annealing temperature around 1000 oC and the crystallinity nature further improves at 1150 oC. The average crystallite size is found to increase with increasing annealing temperature. The strain in the crystalline particles also found to decrease with increasing temperature as confirmed through XRD analysis. The cuboidal morphology with considerable size is observed in nanoparticles by FESEM images. The EDAX spectrum further confirms the presence of pure single phase of desired elements in grown nanoparticles. The dielectric properties were studied using impedance spectroscopy, recorded from 100 Hz to 1 MHz at room temperature for different annealed temperatures. The change in the frequency dependent dielectric properties with increasing annealing temperature are in accordance with the Maxwell-Wagner two layers model for space charge theory and correlated barrier hopping (CBH) model.

Optoelectronic behavior of some spinel oxides for sustainable engineering

“…within the energy span of 0 to 6 electron volts (eV), there is a discernible apex in the refractive index occurring precisely at 3.95 eV, and this peak is a result of the minority state. It's also worth highlighting that, in the energy range of 10 to 18 eV, the refractive index follows a non-linear trend, decreasing as the frequency rises [33,59]. NiFe2O4 possesses an indirect band gap and direct band gap characteristic.…”