The Influence of Li-doping on the Microwave Absorption Properties of BiFeO₃ Nanoparticles

Abstract

The microwave absorbers based on BiFeO₃ have been widely used in the microwave absorbing region due to their excellent electromagnetic characteristics and properties. This study investigated the Li doping effect on the structure, magnetic properties, and microwave absorption efficiency of Bi_1−xLi_xFeO₃ nanoparticles (x = 0.02, 0.04, and 0.06), which were created using the sol-gel method. The test results showed that the increase in the Li doping concentration affects the ferromagnetic properties of the material. The highest magnetic properties were obtained at a concentration of x = 0.06. The magnetic saturation value M_s = 5.4 emu g⁻¹, the magnetic remanence value M_r = 1.53 emu g⁻¹, and the coercive field H_c =106.73 Oe were obtained from the concentration x = 0.06. The doping of x = 0.06 produced three absorption peaks, and the highest absorption peak was −46 dB at 11.22 GHz. To identify the microstructures and electromagnetic properties of the preliminary samples, X-ray diffraction, scanning electron microscopy, and vector network analysis studies were performed. The results showed that Bi_1−xLi_xFeO₃ nanoparticles were successfully collected and that the prepared samples had excellent absorption properties. Overall, due to their outstanding microwave absorption efficiency, Bi_1−xLi_xFeO₃ nanoparticles have numerous potential applications.