Abstract:
Nickel substituted magnesium ferrites (NixMg1-xFe2O4) were prepared by hydrothermal
technique to examine the effect of nickel substitution on the structural, magnetic and
electrochemical properties of these materials. The samples were characterized using X-
ray diffraction, Fourier Transmission Infrared spectroscopy (FTIR), Raman, Cyclic
Voltammetry (CV), Scanning Electron Microscopy (SEM) and VSM techniques. XRD
diffraction indicated a single-phase spinal structure, and the lattice parameter was
lowered from 8.40 Å to 8.33 Å. It was found that the Raman mode for pure magnesium
ferrite was 140cm-1, and this mode decreased in frequency as the Ni concentration
increased because the ionic radius of Ni is smaller than that of magnesium. Using FTIR,
observed that the absorption band at the octahedral site of pure magnesium ferrite is
601cm-1, and that this band changed toward smaller frequencies when Ni concentration
increased due to the increasing bond length. Analyzing the electrochemical kinetics of
the synthesized sample was made possible according to cyclic voltammetry. With an
increase in scan rate, the specific capacitance decreases and the loop size grows,
according to results from CV. Scanning Electron Microscopy (SEM) was used to
measure the grain size and exterior surface morphology of the produced ferrites. The
saturation magnetization and magnetic moment of magnesium ferrites increase as the
Ni concentration increases according to M-H loop.
