Study of structural, spectral, morphological and absorption properties Ba-Co-In-Fe-O system

Abstract

Recently, hexagonal ferrites with extraordinary properties (dielectric, structural, and low reflection losses) have been used for microwave absorption and to resolve the EM (Electromagnetic) pollution issues. In the recent work, nano-sized Z-type hexagonal ferrites with chemical composition Ba3Co2InxFe24-xO41; 0.0 ≤ x ≤ 0.12 (in a single step of 0.03) were synthesized via the sol-gel route. The samples were sintered at 1250 °C for 6 h to meet single-phase requirements. Confirmation of pure Z-phase ferrite was obtained from the XRD study. Lattice parameters were calculated from cell software. Crystallite size showed a decreasing trend with increasing indium content in the 30 to 26 nm range, while one sample appeared with a size of 37 nm. The maximum cell volume of 1574 (Å3) confirms a successful iron replacement with Indium. Morphological studies via SEM show that hexagonal ferrite with platelet structure is prepared successfully. FTIR analysis at room temperature showed two absorption bands in the 400-600 cm−1 range for octahedral and tetrahedral site vibrations. Various dielectric parameters were studied at room temperature in the frequency range of 1 MHz–6 GHz. The Indium substituted Fe3+ at the octahedral site and reduced ferrous-ferric hooping, reducing the real and imaginary permittivity.Furthermore, minimum reflection loss of −51.3 dB and −53.9 dB was observed for materials x = 0.06 and 0.12, reflecting that these materials best fit for microwave absorber application. All samples, including EM interference shielding and radar cross-section reduction, are significant for stealth applications. These In3+ substituted Ba3Co2Z Hexa-ferrites might be a good candidate for high-frequency wave applications.