Electromagnetic absorption and structural properties of SrFe11.98Mg0.1Sn0.1O19/BaTiO3 nanocomposites

Abstract

In this research, first, nanoparticles of SrFe_11.98Mg_0.1Sn_0.1O₁₉hexaferrite was synthesized via sol-gel auto-combustion process and then the nanocomposites of hexagonal ferrites/perovskite with the amounts of SrFe_11.98Mg_0.1Sn_0.1O₁₉/BaTiO₃ (50/50, 40/60, 70/30 w/w) was prepared by the ball-milling method. Fourier transform infrared (FTIR) spectrums of SrFe_11.98Mg_0.1Sn_0.1O₁₉,was shown that the bands at about 400 and 500 cm^-1 proved the formation of nano hexagonal ferrites. On the FTIR spectrum of nanocomposites, the Ti-O bond of perovskite appeared. X-ray diffraction (XRD) analysis was confirmed the formation of hexaferrite and perovskite phase of BaTiO₃. Field emission electron microscopy (FESEM) pictures have represented the formation of hexagonal nanoparticles and sphere shape of BaTiO₃. Vibrating sample magnetometer (VSM) hysteresis loop was revealed that SrFe_11.98Mg_0.1Sn_0.1O₁₉belonged to the soft magnetic materials due to the 604.45Oe coercivity. By formation of nanocomposites, the coercivity was increased up to 1500 Oe. Vector network analyzer (VNA) analysis was revealed the maximum absorption of -16.4 db at 11.5 GHz frequency for SrFe_11.98Mg_0.1Sn_0.1O₁₉/BaTiO₃ (60/40) nanocomposite sample.