Combination of perovskite and magnetic inverse spinel structures to improve microwave absorption properties

In this work, nanocomposites were prepared by filling polyester matrix with SrTiO3 by using some spinel ferrites such as magnetite, cobalt ferrite, manganese ferrite, and polyaniline (PANi) as fillers. These nanocomposites were synthesized by the hydrothermal and co-precipitation and hydrothermal and interfacial polymerization. Radar absorption parameters were measured in the X-band range by the transmission line method by using a straight rectangular waveguide. X-ray diffraction analyzer, scanning electron microscope, and vector network analyzer were used to characterize the materials. The Taguchi method was used to optimize and study the effects of the weight ratios of fillers, type of spinel ferrite, and thickness on the radar absorption properties of nanocomposites by the total weight ratio of fillers of only 5%. The optimal conditions were a nanocomposite of manganese ferrite as the magnetic filler with a weight ratio of 2:1 for both spinel ferrite/SrTiO3 and spinel ferrite + SrTiO3/PANi at 1-mm thickness. All the prepared nanocomposites had a broadband reflection loss spectrum less than -20 dB over the entire X-band. (C) 2017 Elsevier B.V. All rights reserved.