Bio-silica incorporated barium ferrite composites: Evaluation of structure, morphology, magnetic and microwave absorption traits

A series of bio-silica incorporated barium-ferrite-composites with the composition of (x)Bio-SiO2:(80-x)γ-Fe2O3:(20)BaO, where x = 0, 1, 2, and 3 wt% were prepared using the modified solid-state reaction method. The influence of different bio-silica (extricated from sintered rice husk) contents on the surface morphologies, structures, and magnetic characteristics of these composites were assessed. The relative complex permittivity and permeability were resolved using the Nicholson-Ross-Weir strategy in the frequency range of 8–13 GHz. Meanwhile, the reflection loss was estimated through the transmission/reflection line theory to assess the MW absorption properties of the composites. Incorporation of the bio-silica in the barium ferrite composites generated a new hexagonal phase (Ba3Fe32O51) and a tetragonal phase (BaFeSi4O10) which led to a decrease in the saturation magnetization and significant shift in the MW frequency absorption peak positions. •Bio-silica integrated barium ferrite composites (SiBFCs) were prepared.•Structure, morphology, magnetic and MW absorption traits of such SiBFCs were assessed.•The SiBFCs revealed a new hexagonal (Ba3Fe32O51) and tetragonal (BaFeSi4O10) phase.•Achieved SiBFCs were shown to be useful for the MW absorption devices applications.•Minimum reflection loss was tailored by controlling the bio-silica contents in SiBFCs.