Abstract
In this research a thin broad band and efficient microwave absorber was prepared by the conventional Sol-Gel method and identified by Fourier transform infrared (FT-IR), diffuse reflection spectroscopy (DRS), field emission scanning electron microscopy (FE-SEM), vector network analyzer (VNA), x-ray powder diffraction (XRD), and vibrating sample magnetometer (VSM). Interfacial and dipolar polarization effects on microwave absorption were investigated for silicone rubber having a dielectric-strength and polyvinyl chloride (PVC) with dipolar effects in microwave-absorbing matrices. Moreover, the Snoek’s limit related to the size of nanoparticles was investigated using organic templated nanoparticles. According to the VSM and FE-SEM results, magnetic properties and average size of modified nanoparticles were enhanced. According to VNA results, the effective bandwidth (RL <−10 dB) of La0.8Sr0.2FeO3/silicone rubber, modified La0.8Sr0.2FeO3/silicone rubber, and La0.8Sr0.2FeO3/PVC nanocomposites were 3.51, 3.47, 3.65 GHz while the La0.8Sr0.2FeO3/silicone rubber nanocomposite absorbed 64.28 dB at 9.88 GHz with a thickness of 1.8 mm.
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