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دراسة الخصائص التركيبية والكهربائية والمغناطيسية للفرايت النانوي ذي التركيب المغزلي المحضر بطريقة السول (NixCu0.2Zn0.8 - xFe2O4) - جل ذات الا حتراق التلقائي == Studying Structural , Electrical and Magnetic Properties for Nano Spinel Ferrite of (NixCu0.2Zn0.8 - xFe2O4) Prepared by Sol - Gel Auto Combustion Method
Author name:
عمار عيسى عباس نجم الربيعي
Supervisor name:
احمد رفيق عبد المجيد
General topic:
Physics
Specific topic:
Laser Physics and Electro-optics
Degree:
Master
University:
University of Baghdad - Ibn Al-Haytham College Of Education For Pure Sciences - Physics Department
Language:
Arabic
University location:
Baghdad
First pages:
26T1887 - p.pdf
Abstract:
In this research , Nano spinel ferrite (NixCu0.2Zn0.8 - xFe2O4) was synthesized using sol - gel auto - combustion and flash combustion methods .Nineteen samples were prepared and their studies were divided into three parts. Study the effect of citric acid in preparation of Nano ferrite (Ni0.1Cu0.2Zn0.7Fe2O4) by changing the molar ratio of adding fuel to any sample and the five samples were prepared from (C series). The structural properties of samples were studied using x - ray diffraction technique (XRD) and scanning electron microscope (SEM) which showed that the obtained ferrite possesses spinel cubic phase for all used molar ratios , besides when the concentration of adding fuel was increased leads to decrease in grain size and theoretical density , increase in dislocation density and the surface area. Then the molar ratio (1 : 1 M) was chosen as the best adding ratio due to that the obtained ferrite at this ratio possesses best texture coefficient with small grain size and best internal strain by comparing with the other ratios. Study the influence of substitute (Zn+2) ion by (Ni+2) ion on the structural , electrical and magnetic properties of Nano ferrite powder (NixCu0.2Zn0.8 - xFe2O4)(0.1≤X≤0.7) synthesized using sol - gel auto - combustion method , there are seven samples were prepared (A) series and tested by two types of structural test included analyzer x - ray diffraction and scanning electron microscope, the results exhibited forming the spinel phase for all samples in spite of the substitute of (Zn+2) ion by (Ni+2) ion, and the increase of (Zn+2) ions concentration leads to decrease in the grain size and increase in theoretical density. Then the ferrite powder was divided in two groups, the first was pressed into the pellet shape which was used in electrical tests and the second group was pressed into the rings shape which was used in magnetic tests. The two faces of the pellets in first group polished by silver paste material in case to obtain a ceramic capacitors that subjected to electrical tests which included the measurement of dielectric constant , dielectric loss coefficient, alternating electrical conductivity and direct electrical conductivity ,and the study of magnetic properties for the rings samples included measurement of hysteresis loop , selfinduction, initial permeability and the relative loss factor. The results of electrical tests exhibited decrease in dielectric constant with frequency increase at room temperature , and dielectric constant increases at certain ratios of adding (Zn+2) ions and decreases at other ratios. However , the dielectric loss coefficient its fall when increasing frequency until reaches its lowest value at the high frequencies values and so it is various when the concentrations of (Zn+2) ion were changed .and the measurement of alternating electrical conductivity displaying it increases with the increasein frequency and it values disparity with the change of (Zn+2)ion concentration , in other hand the direct electrical conductivity increase with substituting (Zn+2) ion concentration increases. The magnetic tests results exhibited that the ratio (X=0.3) with chemical formula (Ni0.3Cu0.2Zn0.5Fe2O4) possesses a significant magnetic properties when compared with other samples because it has the highest initial permeability with lowest relative loss factor and it has best hysteresis loop so that it realized conditions for using it as a cores in transducers and electrical motors. Study the influence of substituting (Zn+2)ion by (Ni+2) ion on the structural properties of Nano ferrite (NixCu0.2Zn0.8 - xFe2O4)(0.1≤ X≤ 0.7) synthesized using flash combustion method, there are seven samples were prepared (F) series tested by two types of structural tests included xray diffraction and scanning electron microscope tests , and the results exhibited form the spinel phase for all samples and no other phases were presented and observed that structural results were agreed with these obtained from sol - gel auto - combustion method.
