Preparation and characterization of Chromium-Doped Ni-Cu-Zn Nano Ferrites

Abstract

Chromium doped Ni-Cu-Zn nano ferrites with chemical formula Ni_0.2Cu_0.2Zn_0.6Fe_2-xCr_xO₄ (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) were prepared by using sol-gel auto combustion method. The prepared precursors of Chromium substituted Ni-Cu-Zn ferrites were sintered at 500 ⁰C for 4h. Compositional stoichiometry were confirmed from EDAX patterns. The XRD data revealed that the all samples possess a single phase cubic spinel structure. The Lattice constant, X-ray density, hopping lengths and crystallite size determined from XRD data decreases with increase in Cr³⁺ concentration. The IR spectra show two major absorption bands, high frequency band ν₁ ≈ 600 cm^-1 and low frequency band ν₂ ≈ 450 cm^-1 attributed to the stretching vibration of tetrahedral and octahedral sites respectively. The surface morphology of the prepared samples was studied by Scanning Electron Microscopy and Transmission Electron Morphology.