Soft Li-Ti-Zn ferrites with resistivity > 108Ω.cm

Lithium-Titanium-Zinc spinel ferrites are shown to be candidates to replace Mn-Zn or Mn-Mg-Zn ferrites in industrial applications such as television deflection yokes where moderate initial permeability (500 to 1000) but high resistivity (>10⁸Ωcm) are needed. The best compromises are found in the composition range given by0.45 \leq z \leq 0.60and0 \leq t \leq 0.15in the following formula : Li0.5(1+t-z)ZnzMnmFe2.5(1-0.2z-0.6t-0.4m-ε)TitO4where the Iron deficiency ε and the Manganese amount m are chosen in order to avoid any Fe²⁺formation. Bismuth addition in the range 10^-3- 10^-2Bi/mole reduces sintering temperature under 1000°C and strongly enhances the final electrical resistivity.