Microstructural and magnetic studies on BaMgxZnxX2xFe12−4xO19 (X=Zr,Ce,Sn) prepared via mechanical activation method to act as a microwave absorber in X-band

In this study, doped barium hexaferrite with the composition of BaMgxZnxX2xFe12−4xO19 (where x= 0.3, 0.5, 0.7, 0.9 and X= Zr, Ce, Sn) was prepared via mechanical activation. X-ray diffractometer (XRD), FTIR spectrophotometer, Field emission scanning electron microscope (FE-SEM), vibrating sample magnetometer (VSM) and vector network analyzer (VNA) were used to analyze its phases, structure, electromagnetic and microwave absorption properties respectively. Based on the results, single phase barium hexaferrite was obtained in all cases after milling the mixed powders for 20 h plus calcination at 1000 °C for 5 h. Morphology of the particles in all of the doped samples was completely hexagonal shape and they had an appropriate distribution. It was found that the sample of BaMg0.9Zn0.9Zr1.8Fe8.4O19 with saturation magnetization and coercive force of 37.3 emu/g and 94 Oe respectively possessed the maximum reflection loss of −19.3 dB at 12.3 GHz with 1.7 GHz bandwidth.