Magnetic and structural properties of Co-substituted barium hexaferrite synthesized by hydrothermal method

Abstract

In this work, submicron powders of Co-substituted barium hexaferrites were obtained by hydrothermal synthesis (BaFe12-xCoxO19 with x = 0.1, 0.3, 0.5). According to XRD data, all samples were single-phase hexaferrites. From the dependence of the lattice volume on the cobalt concentration, it was concluded that the charge balance is achieved mainly due to the formation of oxygen vacancies. With the help of Mössbauer spectroscopy, the distribution of cobalt over hexaferrite sublattices was established, namely, the absence of any site preferences was observed. The magnetometry results correlated with the data on the cationic distribution in BaFe12-xCoxO19: with an increase in the cobalt concentration, the saturation magnetization decreased.