Synthesis of fine-grained calcium hexaferrite and investigation of its structural and magnetic parameters

The results of investigations aimed at creating a system of fine-grained crystals of calcium hexaferrite doped with lanthanum (barium) are presented. An integrated technological approach that involves two cycles is implemented. At the first stage, i.e., the stage of preparing the charge mixture, a high-efficiency cryochemical technology that allows one to obtain a chemically homogeneous (at the atomic level) ferrite charge mixture was used. At the second stage, namely the stage of ferritization, 1.2–4.8 wt % of a low-melting flux was added to an oxide charge mixture of ferrite that made it possible to reduce the temperature of complete ferritization and, thus, to create the conditions for formation of nano- and microcrystals of a specified composition. The specimens of the synthesized magnetic powder demonstrated magnetic properties at the level of the best microcrystalline systems of barium hexaferrite.