Improvement of initial permeability for Z-type ferrite by Ti and Zn substitution

We have found that the initial permeability μ′μ′ of Co2ZCo2Z ferrite is improved by the substitution of Ti4+Ti4+ and Zn2+Zn2+ ions for Fe3+Fe3+ ions. The substituted sample of Ba3Co2TixZnxFe24-2xO41Ba3Co2TixZnxFe24-2xO41 with x=0.85x=0.85 has a maximum μ′μ′ of 24, which is twice as large as that of the non-substituted sample with x=0x=0. The particle size and shape are changed by the substitution. This is influential in the densification and the preferential orientation of a toroidal-shape sample, which results in the improvement of μ′μ′.