Abstract
The compound was prepared from (ZnFe2O4) and (CdFe2O4) The process of mixing the ferrite compounds was done according to the formula (CdxZn1-xFe2O4), The resulted compound was (Cd0.7Zn0.3 Fe2O4). The compounds (ZnFe2O4) and (CdFe2O4) were prepared by Co-Precipitation method because this method gives a good homogeneity to the powder particles. XRD and FE-SEM were performed, the results showed that ferrites had a phase-shaped cube and an increase in the concentration of cadmium in the (CdxZn1-x Fe2O4) compound .This result showed an increase in the lattice constant, the rate of crystalline size and the distance between the crystalline surfaces, due to the fact that the ionic radius of the cadmium is greater than the ionic diameter of the zinc, which is (0.83 A°).The images of the electron microscope (FE-SEM) showed an increase in particle size with an increase of concentration of cadmium ferrite in relation to the compound (CdxZn1-x Fe2O4),The components of the ferrite structures prepared by EDS technique were verified, where the ferrite compound (Cd0.7Zn0.3Fe2O4) mixed with the Neoprene (Chloroprene Rubber) (CR) according to weight ratio of (3,6 g) of ferrite, after the process of forming rubber paste. The VNA was investigated for (8-12 GHz). It was observed that the reflection coefficient was reduced by increasing the fraction of ferrite to (6g) and obtain highly absorbent materials .Where the material behavior varies according to the frequency, as well as the concentration ratio in the ferrite and the quantity of the ferrite with Chloroprene rubber (CR).The Permeability of (Cd0.7Zn0.3Fe2O4) was calculated as a function of frequency.The real part of the amplitude showed the amount of energy from the external electric field stored in the material.
Highlights
(Ferrites) are materials of magnetic ceramics [1].with chemical compositions and various semi-conductive crystalline structures, all of which have ferromagnetic material
The composite ferrite of (ZnFe2O4) and (CdFe2O4) was characterized by using (XRD) after the sintering at (900 oC) figures(1 a,b) The (ZnFe2O4) was found to be identical to the standard card (00-022-1012 icdd) and for (CdFe2O4) with the standard card were showing that the diffraction peaks at the crystalline levels (111, 220, 311, 222, 400, 331, 422, 511, 440, and 531). which confirm the formation of phase shaped cubic of the FCC structure. which shows that the preparation method ensures the incorporation of positive ions in the structure of the spinel ferrite and after mixing the two compounds to form the compound (Cd0.7Zn0.3Fe2O4)
The distance was calculated for.crystal size for (311) as shown in table(2) compiles of the calculations found that the x-ray diffraction showing lattice constant of the compound (Cd0.0Zn1.0Fe2O4) will be (8.425887647). and for (Cd1.0Zn0.0Fe2O4) will be (8.916407702) after mixing the composite fracture compounds by formula (CdXZn1-XFe2O4)
Summary
(Ferrites) are materials of magnetic ceramics [1].with chemical compositions and various semi-conductive crystalline structures, all of which have ferromagnetic material It possesses high resistivity (109 ) [2]. One of the most important properties of the ferrite which led to its widespread uses is as a magnetic materials [9] It operates with a wide frequency range ,low losses ,thermal stability and low cost. An important feature when blending the ferrite with the rubber is to obtain an overlay that acts as a wave attenuation and it highly susceptible to wave absorption]21,20[ The properties of these materials depend on the granules and their size, on the method of preparation, sintering temperature, the type of elements and their constituent quantities of the material. The general formula for the hard ferrite is (M +2Fe12O19) where (M) a divalent metal ion such as barium (Ba) and strontium (Sr) [6,7].The preparation
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