Barium Ferrite

Barium ferrite, abbreviated BaFe, is the inorganic chemical compound with the formula BaFe2O4. Chemically it is described as Ba2+(Fe3+)2(O2-)4. The Fe3+ centers, with a high-spin d5 configuration, are ferromagnetically coupled. In contrast to the usual spinel structure, these materials feature hexagonally close-packed framework of oxides. Furthermore some the oxygen centers are replaced by Ba2+ ions. Formulas for these species include BaFe12O19, BaFe15O23, and BaFe18O27.

Thus, BaFe12O19 is related to Fe12O20, with the empirical formula Fe3O4, i.e. magnetite.Barium ferrite is a component in magnetic stripe cards. It finds application in subwoofer magnets to provide power. It is a robust ceramic that is generally stable to moisture and corrosion-resistant.