چكيده به لاتين
In this research, using the chloride salts of iron and cobalt metal as the primary materials, sodium hydroxide as precipitant and hydrazine hydrate as reducing agent, the FeCo alloy is synthesized in the 50-80°C temperature range. The phase analysis of the collected products was performed by powder x-ray diffraction (XRD), The morphologies of the particles were characterized by field-emission scanning electron microscope (FE-SEM), magnetic properties of samples were acquired by a vibrating sample magnetometer (VSM), emission or absorption spectra of matter investigated by Fourier-transform infrared spectroscopy (FTIR) and Microwave absorption properties evaluated with Vector network analyzer (VNA). By studying the effective terms of test, it was found that Reduction of FeCo with hydrazine hydrate is independent of time and best Temperature for Reduction is 50-80°C. Increasing the reaction temperature will increase the rate of nitrogen gas exhaustion in the reaction, which will increase the movement of particles and increase their energy. In this circumstance, the protective effect of this gas against oxidation of particles is reduced and interconnections between particles occur. In reverse co-precipitation method, due to the homogeneity of OH ions in the test environment, particles are smaller and distribution is more uniform. CTAB surfactant at low concentrations causes anisotropic distribution of surface loads and generates agglomeration of 4 micron particles. At higher concentrations of this surfactant, selective adsorption occurs, and along with fine particles, coarse particles are also observed. In the presence of carboxyl, carbonyl and hydroxyl groups, hydrazine is not able to synthesis FeCo particles, and therefore FeCo / CNT composites are not prepared by chemical method. A mechanical mixing method was used to create this composite. The microwave absorption properties of FeCo / CNT composite a were investigated in two X and Ku frequency ranges. In X frequency band, the maximum amount of reflection loss occurred at approximately -8dB and at an approximate 9/5Ghz frequency. This amount is equal to 79% of absorption. In the Ku band, the maximum reflection loss occurred at around -4/3dB and at an approximate 18GHz frequency. This amount is equal to 57% of absorption.
