Barium hexaferrites BaFe12–xInxO19 (where x varies from 0 to 5 with a step of 0.25) is prepared by the solid-phase synthesis conducted at 1400 °C for 5 h. The crystal lattice parameters and chemical compositions of the samples prepared are determined. Dielectric and magnetic permeability values are calculated for each sample with x = 0-1.25.