Abstract
Chromium doped Ni-Cu-Zn nano ferrites with chemical formula Ni0.2Cu0.2Zn0.6Fe2-xCrxO4 (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 °C 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.
Highlights
Nano ferro spinels are of great interest for addressing relationship between physical properties and their crystal structure
Considering the importance of Ni-Cu-Zn ferrite, we investigated the preparation of chromium doped Ni-Cu-Zn nano ferrite by sol-gel auto-combustion method using citric acid as fuel at low temperature with a view to study the influence of the substitution of Cr3+ ion on the structural properties of the system
Sintering temperature was determined from thermo gravimetric (TGA) / differential thermal analysis (DTA) and prepared powders of all the precursor samples were sintered at 500 °C for 4h to obtain the final product
Summary
Nano ferro spinels are of great interest for addressing relationship between physical properties and their crystal structure Due to their reduced sizes, these nanoparticles may possess novel and/or improved properties in comparison to the bulk materials. This has renewed interest to study different properties of pure and mixed spinel ferrite systems in nanocrystalline regime.
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