STRUCTURAL, MAGNETIC, THERMAL AND ABSORPTION CHARACTERISTICS OF Co–Fe ALLOY/COBALT FERRITE COMPOSITES
DOI:
https://doi.org/10.15421/jchemtech.v34i2.354370Keywords:
magnetic nanoparticles; cobalt ferrite; X-ray diffraction analysis; spinel.Abstract
Co-Fe/cobalt ferrite composite nanoparticles were synthesized by hydrothermal method in a high-temperature reactor. X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), vibrational magnetometry (VSM), differential thermal analysis and thermogravimetry (DTA/TG), respectively, were used to characterize the crystal structure, functional groups, particle size, morphology, and magnetic and thermal properties of the obtained samples. Analysis of X-ray phase analysis data showed that the particles have a two-phase structure consisting of spinel and alloy. Structural and magnetic studies confirmed the formation of Co-Fe/cobalt ferrite composite nanoparticles with a crystallite size of approximately 80–100 nm and shape anisotropy. The saturation magnetization was 190 Emu/g. According to the data of differential thermal analysis and thermogravimetry, the composite is oxidized in an argon atmosphere due to the presence of bound water and hydroxyl groups. A pronounced exothermic effect is observed. The microwave absorption properties of the composite were investigated in the X-band (8–12 GHz). The high absorption value indicates that these composites can be used as promising radio-absorbing materials.
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