الفهرس 
Experimental Techniques
X-ray diffraction (XRD)Only 14 pages are availabe for public view
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Abstract
The main aim of this work is to study the structural, magnetic and electric properties of the as-prepared and annealed MgxCu(1-x)Fe2O4 nano-spinel ferrites; where x= 0.0, 0.2, 0.4, 0.6, 0.8 and 1 molar fraction, the annealing temperatures (T) were 300, 500, 700, 700, 900 or 1100oC. The nano-ferrite samples were prepared by the chemical co-precipitation method. Suitable amount of each powder sample was annealed for 2 hours at the desired temperature. The techniques used in this study were the X-ray diffraction (XRD), transmission electron microscope (TEM) images, infrared (IR) spectra, Mössbauer spectroscopy, vibrating sample magnetometer (VSM), relative permeability and DC and AC conductivity experiments.The XRD patterns of the samples proved a single-phase spinel structures. The diffraction peaks for the as-prepared samples showed broad lines. The sharpness and intensity of the reflection peaks were increased with the annealing temperature T. The lattice parameters, crystalline size, density and porosity were measured as functions of compositional factor .x. These parameters showed dependence on the compositional parameter x and a little dependence on T. The image of transmission electron microscope (TEM) confirmed the nanostructure property of the samples.The IR spectra proved the formation of nano-spinel structure, where seven absorption bands were observed in the spectra. The two characteristic absorption bands of spinel ferrites and other absorption bands and force constant for the tetrahedral A-sites and octahedral B-sites were x and T dependent.The room temperature Mossbauer spectra for as-prepared samples showed a small magnetic phase and/or paramagnetic phase. The spectra of the annealed samples revealed the growth of the magnetic phase with T. The deduced parameters were strongly affected by x and T, where the cation distributions were estimated.