Abstract
This study deals with the effect of Mg2+ doping on the structural, optical, and dielectric properties of zinc manganite nanoparticles. A series of MgxZn1-xMn2O4 (x = 0–0.5) samples were prepared with an auto-combustion synthesis method. Rietveld refinement of XRD revealed a pure tetragonal inverse spinel phase, supported by FTIR spectral analysis. Morphological studies indicated the transformation of micro-spherical to rod-like shapes for doped samples. With increased dopant concentration, the three Raman active modes shift towards higher frequencies. The co-existence of Mn2+, Mn3+, and Mn4+ states was revealed by chemical state analysis. The MZMO-5 sample exhibited the smallest energy bandgap (∼1.64 eV). The refractive indices of these samples were estimated to be ∼ 0.4 which might be useful for switching and filter circuits. These nano-manganite samples exhibited high dielectric constants and low losses, indicating their potential use in communication devices.
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