Iron oxide/titania composites for radar absorbing material (RAM) applications

Abstract

Iron oxide/titania composites were synthesized by precipitation method. Amount of iron oxide was varied in the composites. The single phase (anatase) was obtained for the weight ratio of 0-20% and three phases (anatase, magnetite and hematite) were found for the weight ratio of 30% and 40% of iron oxide. The crystallite size of titania decreased with increasing of iron oxide content. The specific surface area, total pore volume and BJH pore volume of the sample increased with increasing iron oxide content in the composite. The composites possessed mesoporous characteristic (6.5-9.6 nm in pore diameter) and exhibited ferromagnetic properties. The measurement of the microwave absorption showed that the 40Fe/Ti composite had the best reflection loss of -14 dB at a frequency of 10.9 GHz. This meant that the electromagnetic wave was absorbed 80% in that frequency. Thus, the developed material can be a promising microwave absorbing agent in radar signature reduction.

Plasma Generating—Chemical Looping Catalyst Synthesis by Microwave Plasma Shock for Nitrogen Fixation from Air and Hydrogen Production from Water for Agriculture and Energy Technologies in Global Warming Prevention

“…Radiation absorption and energy dissipation in the form of heat by a material occur via dielectric and/or magnetic loss [138][139][140][141][142]. Therefore, so called "Radar Absorbing Materials" (RAMs) should have large permittivity and permeability for an efficient absorber [143][144][145].…”

Analisis Mikrostruktur Dan Sifat Magnetik Terhadap Pengaruh Suhu Sintering Pada Yttrium Iron Garnet Disintesis Menggunakan Metode Solgel

“…Material jenis ini memiliki karakteristik nilai permeabilitas dan permitivitas yang baik sehingga dapat berinteraksi dengan gelombang elektromagnetik yang kompleks. Bahan smart-magnetik ini biasanya terdiri dari gabungan unsur logam tanah jarang dan logam transisi yang menghasilkan sifat magnetik yang dapat berfungsi sebagai bahan penyerap gelombang elektromagnetik (Winatapura et al 2020;Nimbore et al, 2006;Fisli et al, 2019;Mashadi et al, 2018). Garnet merupakan salah satu kandidat bahan smart-magnetik yang memiliki potensi luas untuk dimanfaatkan dalam berbagai aplikasi di bidang teknologi seperti bahan penyerap gelombang elektromagnetik, bahan sensor, dll ( Winatapura et al, 2020) Yttrium Iron Garnet (YIG) atau dapat ditulis dengan Y 3 Fe 5 O 12 merupakan tipe material garnet yang paling banyak digunakan untuk berbagai aplikasi di bidang teknologi diantaranya sebagai bahan frekuensi tinggi dan bahan penyerap gelombang elektromagnetik.…”

Electrical Insulation and Radar-Wave Absorption Performances of Nanoferrite/Liquid-Silicone-Rubber Composites

“…Dielectric materials are applied in radar-wave absorption through dielectric polarization and relaxation loss. Nowadays, studies on dielectric wave-absorbing materials focus on barium titanate perovskites, barium ferric acid, and ferroelectric ceramics [ 11 , 12 , 13 , 14 ]. Magnetic radar-absorbing materials rely on magnetic loss to absorb and dissipate radar electromagnetic waves, which is competent of matching impedance as implemented in composite materials mainly composed of dielectric rubber matrix and functional fillers such as ferrite, carbonyl iron, ultrafine metal powder [ 15 , 16 , 17 , 18 ].…”