Electromagnetic properties of manganese–zinc ferrite with lithium substitution

Polycrystalline manganese–zinc ferrite with lithium substitution of composition Li0.5xMn0.4Zn0.6−xFe2+0.5xO4 (0.0≤x≤0.4) was prepared by the usual ceramic method. X-ray diffraction analysis confirmed that the samples have a spinel structure and are of single phase for some values of Li content. Lithium doping considerably modifies saturation magnetization since its value increases from 57.5 emu/g for x=0.0 to 82.9 emu/g for x=0.4. Lithium inclusion increases the real permeability (over 1 MHz) while the natural resonance frequency shifts to lower values as the fraction of Li increases. These ferrites show good electromagnetic properties as absorbers in the microwave range of 1 MHz – 1 GHz.

► Li-doped manganese–zinc ferrites were successfully prepared by the usual ceramic method.
► Lithium doping enhances saturation magnetization and increases real permeability (over 1 MHz).
► Natural resonance frequency shifts to lower values as fraction of Li increases.
► These ferrites show good electromagnetic properties as absorbers in the microwave range of 1 MHz–1 GHz.