Characterization and Investigation of Magnetic and Microwave Properties of Al–Cr-Substituted Z-Type Barium Hexaferrite Nanoparticles

摘要: Aluminium-and chromium-substituted Z-type hexaferrite nanoparticles with a composition of Ba3 Co1.8Mn0.066Ni0.066Cu0.066Fe24−2y Al y Cr O41 (y = 0–0.8 in step 0.2) were prepared by co-precipitation-assisted solid-state synthesis method. The effect Al 3+ and Cr cation substitution on the structural, magnetic microwave absorption properties barium was investigated X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM) vector network analysis. XRD patterns showed that main peak intensities corresponded to Co2Z phase as addition M Co2Y-type impurity phases. lattice parameters (a c) obtained from data decrease an increase content y. SEM micrographs particle size is range 50–300 nm. FT-IR spectra also indicated there two bands characterizing ferrites 430–590 cm −1. They identified metal–oxygen stretching vibrations Ba-Z hexaferrite. results hysteresis loops increasing amount dopant y 0. 0.4, saturation magnetization coercivity increased 60 emu/g 1306 Oe 73 1850 Oe, respectively. In addition, it can be seen maximum reflection loss substituted −37 dB at frequency 9.9 GHz bandwidth 4.5 (reflection more than −20 dB). As result, found Al–Cr-doped proposed suitable absorbers for applications technology good deal consistency.