BOOSTING THE MICROWAVE ABSORPTION PROPERTIES USING GRAPHENE FUNCTIONALIZED WITH MG-MN-ZN-BI FERRITES

Abstract

Graphene (Gr) composites with Mg0.5Mn0.375Zn0.125Bi0.05Fe1.95O4 (MMZB nano ferrites), (Gr= 0%, 1%, 2%, 3%, 4%) were synthesized by using the sol gel auto combustion method. XRD, FTIR and Uv-Vis confirmed the significant improvement in structural, vibrational and optical properties of MMZB ferrites\Gr composites with fusion of Gr. The lattice parameter ‘a’ varies with increasing Gr concertation. From the FT-IR spectra the absorption bands observed in the range of 541-563 cm-1 and 421-461 cm-1 are attributed to the fusion of Gr in MMZB Ferrite/Gr Composites. The d.c resistivity of ferrite samples increased as the temperature increased in ferromagnetic region up to curie temperature, after that its decreased. However, increase in resistivity was observed with increasing Gr concentration except at Gr = 3%. The values of optical band gap were found to decreased from 4.45 to 3.50 eV with increasing Gr content. It has been observed that both the dielectric constant and loss factor decreased with the increase of frequency. The minimum dielectric loss was observed for Gr =4 %. The values of saturation magnetization and microwave frequency decreases with fusion of Gr. A remarkable change in microstructures, electrical and magnetic properties was observed with fusion of Gr. Due to these promising properties these materials may be used for microwave frequency devices.