Material Sciences

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Objective: Synthesis and characterization of magnetic and dielectric materials Complex permittivity, complex permeability and reflection loss measurement (in C and X band) of all developed materials Optimization and fabrication of magnetic and dielectric materials based composites suitable for microwave absorption for large bandwidth and higher absorption

Summary: A material's absorbency at a given frequency of micro wave depends upon its composition, thickness of coating and particles size. Single MAM cannot perfectly absorb microwave at any frequency, but any given composition does have greater absorbency at some frequencies than others. There is no single MAM that is suited to absorb all microwave frequencies. Single material known by literature review namely; barium hexaferrite (BaFe12O19), strontium hexaferrite (SrFe12O19), calcium hexaferrite (CaFe12O19), nickel ferrite (NiFe2O4), zinc ferrite (ZnFe2O4), cobalt ferrite (CoFe2O4), silicon carbide (SiC), or materials containing carbon like charcoal, carbon black, graphite, carbon nano tubes etc. alone cannot meet the demand of large absorption peak, wide working frequency range and thin absorption layer. In order to improve electromagnetic absorption properties, new systems have been evolved comprising of composite powder including carbon powder/silicon carbide, earth-iron-boron, Ni-P coated ferrite, Co/CNTs, ZnO/CNTs, carbon black/SiC, CoFe2O4/CNT, carbon nanofiber/NiFe, CNT/Fe3O4 etc. Therefore, present proposal aims to fabricate a magnetic and dielectric material based composite that can absorb the microwave for higher bandwidth (C and X band) and large absorption peak.

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