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

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2017-11, Vol.225, p.75-85
• Main Authors: Hajimiri, I., Seyed Dorraji, M.S., Rasoulifard, M.H., Amani-Ghadim, A.R., Khoshroo, M.R.
• Format: Article
• Language: English
• Subjects: Attenuation coefficient; Broadband; Chemical synthesis; Cobalt; Cobalt ferrite; Cobalt ferrites; Ferrites; Fillers; Magnetic properties; Magnetite; Manganese; Manganese ferrite; Microwave absorption; Nanocomposites; Optimization; Polyanilines; Polymerization; Radar absorbing material; Reflection loss; Spinel; Strontium titanates; Superhigh frequencies; Taguchi methods; Thickness
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2017.06.016

[Display omitted] •A nanocomposite with broadband absorption less than −30dB was prepared.•The prepared absorber showed a high performance in the removal of microwaves in the X band range.•The radar absorption properties of SrTiO3 compositions with spinel ferrites were also studied. 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 −20dB over the entire X-band.