Microwave properties of ZnTi-substituted M-type barium hexaferrites

We have prepared magnetic anisotropic polycrystalline hexaferrites Ba(ZnTi)_xFe_12-2xO₁₉ with high orientation degrees f and low dielectric loss tangent tgδ_ε by standard ceramic techniques with magnetic alignment of the grains´ c axis during wet pressing and in flowing-oxygen sintering. When x increases, the saturation magnetization M_s, the Curie temperature T_c, and the anisotropy field H_a of the hexaferrites decrease. The results can be interpreted by assuming that Zn²⁺ ions replace Fe³⁺ ions of the tetrahedral 4f₁ sites and hexahedral 2d sites while Ti⁴⁺ ions replace spin up Fe³⁺ ions of octahedral sublattices 12k and 2a