A Novel magneto-dielectric solid solution ceramic 0.25 LiFe ₅ O ₈-0.75 Li ₂ ZnTi ₃ O ₈ with relatively high permeability and ultra-low dielectric loss

In this study, a 0.25LiFe₅O₈-0.75Li ₂ZnTi₃O₈ solid solution ceramic was developed via the solid-state reaction method. Its phase evolution, microstructure, and sintering behavior were investigated and it was found that the 25 mol.% LiFe₅O₈ phase is almost fully soluble in Li ₂ZnTi₃O_8, and only the Li₂ZnTi ₃O₈ type spinel phase was formed in the 0.25LiFe ₅O₈-0.75Li₂ZnTi₃O₈ ceramic. The ceramic sample sintered at 1050°C for 2 h was found to possess both good magnetic properties and dielectric properties in the frequency range from 1 to 10 MHz, with permeability between 38.2 and 15 and magnetic loss tangent between 0.25 and 0.75, permittivity between 19.6 and 19.3 and dielectric loss tangent between 8 × 10^-3 and 2 × 10^-3. The sample also possesses good microwave dielectric properties with a relative permittivity of 19.1, a high quality factor (Qf) ~11,770 GHz (at 6.84 GHz). The ceramic is a novel magneto-dielectric ceramic with both high permeability and good dielectric properties, which might be a good candidate for the applications in novel electronic devices.