Functional properties of quaternary metals (1 − x)ZnMn2O4/(x) MgFe2O4 as supercapacitor electrode

Abstract
Solid solutions from (1 − x)ZnMn2O4∕(x)MgFe2O4 (x = 0.0, 0.1, 0.5, 0.9, 1.0) were obtained by a simple sol–gel procedure. A
single-phase tetragonal spinel zinc manganite was identified by X-ray phase analysis for the samples x = 0.0 and 0.1, whereas
a single-phase cubic spinel magnesium ferrite was identified for x = 0.5, 0.9, and 1.0. The formation of these phases was confirmed
by the analysis of FTIR absorption spectra measured for the obtained samples. A scanning electron microscope was
used to identify the different elements in the formed solid solution. Transmission electron microscope together with Rietveld
profile method emphasized the nano-nature of the obtained samples. The influence of the composition parameter (x) on the
optical properties of the solid solutions was explored utilizing UV–Vis diffuse reflectance spectroscopy measurements. The
magnetic measurements revealed the conversion of the paramagnetic nature of ZnMn2O4
samples into ferromagnetic nature
as it couples with MgFe2O4
sample in (1 − x)ZnMn2O4∕(x)MgFe2O4 solid solution. The supercapacitor performance of all
samples was examined by cyclic voltammetry and galvanostatic charge–discharge studies.