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

Abstract

The copper doped polycrystalline Cu_xNi_1–xMn₂O₄ (CNMO), Cu_xZn_1–xMn₂O₄ (CZMO), and Cu_xCo_1–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.