Unveiling the Morphological and Dielectric Changes in Copper-Doped Nano Manganites

The copper doped polycrystalline CuxNi1–xMn2O4 (CNMO), CuxZn1–xMn2O4 (CZMO), and CuxCo1–xMn2O4 (CCMO) with (0.05 ≤ x ≤0.55) manganites were synthesized by chemical co-precipitation route. The incorporation of copper in place of nickel, zinc and cobalt in all the three series of samples respectively change significantly the lattice parameters, crystal size, microstrain and dielectric properties at various frequencies. With the increase in copper the lattice parameter and crystallite size decreases for CNMO, CZMO samples and increases for CCMO samples respectively. The dielectric constant increases from 35 to 950, 70 to 410 for CNMO, CZMO samples and (7 to 20) × 103 for CCMO samples at low frequency (10 Hz) with the increment in copper doping.