It is shown that difference between magnetic properties of hexagonal ferrites BaFe₁₂O₁₉ and SrFe₁₂O₁₉ is connected with difference of electronic configurations of Ba²⁺ and Sr²⁺ ions, and their ionic radii. Re-placement of Ba²⁺ ions by Sr²⁺ ions that are smaller in size effects the degree of distortions of octahedrons located either in a hexagonal R-block or at its boundary with S-block. It contributes to a preferred localization of electrically active vacancies at the boundary of R- and S-blocks or in a surface layer of crystallites, and provides residual polarization of ferrites with hexagonal structure.

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