Synthesis, characterization, and AC studies of magnesium ferrite/niobium oxide (MgFe 2 O 4 –Nb 2 O 5 ) nanocomposite at room temperature

We investigated the AC electrical response of MgFe 2 O 4 –Nb 2 O 5 nanocomposite. A simple auto-combustion approach was used to synthesize MgFe 2 O 4 . The nanocomposite made of MgFe 2 O 4 –Nb 2 O 5 was effectively made by using a basic mechanical alloying-technique. The FTIR, XRD, SEM, and EDX methods were used for the structural characterization of elaborated nanocomposites. The dielectric studies indicate that the Nb 2 O 5 reduces the grain resistance when doped in Mg ferrite. As compared to MgFe 2 O 4 –Nb 2 O 5 nanocomposites, the AC conductivity for the nanocomposite MgFe 2 O 4 and Nb 2 O 5 increased. The polarization mechanism of conductivity is explained by permittivity and impedance spectroscopy. The increase in conductivity of nanocomposite is due to the effect of Nb 2 O 5 on relaxation time and grain boundaries found in cole–cole plot.