Preparation and Identification of BaFe₂O₄ Nanoparticles by the Sol-Gel Rut and Investigation of its Microwave Absorption Characteristics at Ku-Band Frequency using Silicone Rubber Medium

In the last decade, spinel structures have been widely explored due to widespread applications in the antibacterial nanocomposites, memory devices, catalysts, photocatalysts, high frequency devices, and electromagnetic absorbing materials. In this study, BaFe₂O₄ spinel structure were synthesized through the sol-gel method using low sintering temperature and then were identified by vibrating sample magnetometer (VSM), X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR), field emission scanning electron microscopy (FE-SEM), and vector network analyzer (VNA) analysis. Results showed that uniform and pure crystal structure of BaFe₂O₄ nanoparticles have been prepared base on the sol-gel method. Finally, BaFe₂O₄ nanoparticles were blended by silicone rubber to characterize microwave absorption properties of the nanocomposite at ku-band frequency. According to the VNA results, BaFe₂O₄/silicone rubber nanocomposite with 1.75 mm thickness absorbed more than 94.38% of microwave at ku-band frequency and the maximum reflection loss of the BaFe₂O₄/silicone rubber nanocomposite was -51.67 dB at 16.1 GHz.