Sol–gel synthesis and characterization of magnesium ferrites by XRD, TEM, EPR, Mossbauer, and impedance spectroscopy

The MgFe 2 O 4 sample was synthesized via the simplest Sol–Gel method. X-ray diffraction and transmission electron microscopy analyses show that the elaborated ferrite has a spherical shape and well crystallized in cubic spinel structure. In addition, the inverse structure of the MgFe 2 O 4 sample was confirmed by 57 Fe Mössbauer spectrometry. EPR studies reveal the existence of the paramagnetic oxygen vacancy (V_O^+) in our sample which can be linked to the reaction process. The conductance measurements show that our sample has a metal–semiconductor transition and the conduction mechanism is governed by the NSPT mechanism. Moreover, Nyquist plot depicts a non-Debye relaxation phenomenon in our material. Furthermore, the Nyquist plot is modeled by an electrical equivalent circuit via Z-view software to rationalize the impedance results.