Abstract
Polycrystalline manganese–zinc ferrite with lithium substitution of composition Li 0.5 x Mn 0.4Zn 0.6− x Fe 2+0.5 x O 4 (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.
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