Analyzing the Microwave Absorption Properties of BaFe12O19, Ba4MnZnFe36O60 and NiFe2O4 Particles

Abstract

A stoichiometric ratio of the Merck chlorides of Barium, Iron, nickel and NaOH as an agent was used to obtain the nano-crystalline ferrites (BaFe12O19, Ba4MnZnFe36O60 and NiFe2O4) by a combination of co-precipitation and high-energy reactive milling (RM) methods. After milling, the as-synthesized ferrite materials were exposed to a heat treatment at 1100°C for 4 h with the heating rates of 10°/min. After cooling the powders of ferrites inside the furnace, they were sintered at 1200°C for 4 h. The microstructural, structural, magnetic, and microwave absorption features were examined by x-ray diffractometry (XRD), scanning electron spectroscopy (SEM), vibrating-sample magnetometry (VSM) and network analysis (VNA), respectively. As can be seen in the hysteresis loops, both saturation magnetization and coercivity were changed by altering the ferrite kind. After sintering, the Ba-ferrites showed a smaller amount of saturation magnetization of 300 G (0.03 T) and a larger quantity of intrinsic coercivity 1.8 kOe (144 KA/m) compared to the Ni-ferrite and Ba4MnZnFe36O60. After sintering, the samples’ reflection loss spectra were changed and reached the maximum value of − 35 dB (at resonance frequency) for NiFe2O4, making it suitable␣for application in the microwave and resonance absorbers.