Synthesis, Structure, and Properties of Hexaferrites of the BaFe_12–xCr_xO₁₉ System

The work presents the results of the synthesis and study of hexaferrite of barium, which is substituted with chromium within limits. The method of obtaining samples of the BaFe_12–xСr_xO₁₉ system for a wide range of x from 0 to 4, with a step x = 0.5, has been worked out. It has been found that the optimal parameters of the synthesis mode are: temperature 1400°C and exposure time 5 h. The chemical composition was monitored using an energy dispersion analyzer. The phase composition was monitored by powder diffractometry. Lattice parameters for single-phase samples were calculated on the basis of obtained diffractograms. A monotonous change in the unit cell parameters was revealed, which was to be expected for isomorphic replacement of iron in the initial matrix with a magnetoplumbite structure. The temperature stability regions of the created samples were studied by differential scanning calorimetry. The influence of the degree of chromium substitution on the Curie temperature due to weakening of the inter-exchange interaction has been established.