Abstract
Copper ferrite-doped magnesium zinc ferrite, i.e., Mg0.5Zn0.5−xCuxFe2O4 (0.0 ≤ x ≤ 0.5) has been synthesized by conventional solid-state reaction technique. The role of copper ion substitution on the crystal and lattice structure and also on the dielectric properties of Mg0.5Zn0.5Fe2O4 ferrite is studied. XRD investigation exposes that the synthesized samples are polycrystalline single-phase cubic spinel in structure without the occurrence of any secondary phase corresponding to any structure. Small deviation in the lattice parameter from 8.412 to 8.374 A of copper-doped Mg0.5Zn0.5Fe2O4 has been observed due to difference in ionic radii of cations with increase in copper doping. Small shift in Raman modes towards higher wavenumber has been observed with Cu doping. Room-temperature dielectric properties show that for each sample, the dielectric constant decreases with an increase of frequency and becomes constant at higher frequencies. Dielectric loss decreases with increase in Cu concentration. The dielectric constant increases to a great extent in prepared samples.
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