Fabrication of the SrFe11MnO19 / CoFe1.9Bi0.1O4 ferrite nanocomposite and investigation the properties of its microwave absorption in X-band

In this study, SrFe11MnO19/CoFe1.9Bi0.1O4 ferrite nanocomposites were synthesized with different mass ratios at 900 °C for 4 h by a sol-gel method. The Fourier-transform infrared spectroscopy (FT-IR) analysis indicates that by increasing the mass ratio of the spinel to hexagonal, (Sr–O) vibration bonds which are located in the tetrahedral sites, are eliminated. X-ray diffractometer (XRD) reveals the simultaneous existence of the hexaferrite and spinel ferrite phases in composites. Also, the maximum value of (B.H)max has belonged to the sample of h/s = 1/4. The field emission scanning electron microscopy (FESEM) of the samples indicated that the particle shapes in hard and soft phases are cylindrical and spherical (or cubic) respectively. Furthermore, vector network analysis (VNA) in X-band, showed that the minimum reflection loss (R L) among nanocomposites has belonged to h/s = 1/4 sample, which occurs at a frequency of 8.6 GHz and its value is equal to −21.5 dB.