Abstract
A series of nanocrystalline Co0.5-xCuxZn0.5Fe2O4(0 ≤ x ≤ 0.25) samples were synthesized in auto combustion route. Archimedes's principle was used to measure density of all samples. The substitution of copper give rise to a gradual rise in experimental density and a noticeable decrease in porosity. Far-Infrared, MID-Infrared and Raman spectra were recorded at room temperature. They displayed characteristic vibrational modes with significant changes with copper substitution. Surface Morphology was studied with Scanning Electron Microscope and spherical grains having clear grain boundaries were observed with an increase in copper concentration. Transmission Electron Microscopy study was performed for the sample with copper concentration x = 0.15 to identify nano-metric dimensions of the particles and it was characterized with interplanar spacing obtained from Selective Area Electron Diffraction pattern. Curie temperature, permeability, DC and AC Electrical resistivities along with dielectric properties were presented. The modifications in electrical properties of all samples were discussed with the help of polaron hopping mechanism and physical properties.
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