Abstract
A series of Al-substituted Mg-Mn ferrite powders with composition Mg 0.8Mn 0.2Al xFe 2−xO4 (x = 0.0, 0.1, 0.2, 0.3, 0.4) were synthesized with nanosized powders through the coprecipitation method. These powders were annealed at 1250 ∘ for 3 h. Samples were characterized by X-ray diffraction (XRD) technique, field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), alternating gradient force magnetometer (AGFM), Curie temperature measuring device, and microwave vector network analyzer (VNA). XRD patterns confirmed that all compositions show a single-phase cubic spinel structure. The FESEM images clearly showed the crystalline structure, and EDS patterns confirm the compositional formation of the synthesized compositions. The room temperature saturation magnetization increased for x = 0.1 and then decreased for further increase in Al substitution. Curie temperature was found to be dependent on the Al concentration, and it decreased due to a decrease in the number of superexchange interactions between Fe 3+ ions in the tetrahedral and octahedral sites. VNA studies indicated a reflection loss of −32 dB at 3.2 GHz for an absorber thickness of 10.8 mm for x = 0.2 sample and with a broad bandwidth up to 2 GHz. Mg 0.8Mn 0.2Al xFe 2−xO4 ferrite may be attractive candidates for electromagnetic wave absorption materials at microwave S band (2–4 GHz) frequencies commercially.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call