Electromagnetic properties of manganese-zinc ferrite with lithium substitution

E. DE FAZIO; P. G. BERCOFF; S. E. JACOBO

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

ELSEVIER SCIENCE BV

Año: 2011 vol. 323 p. 2813 - 2817

0304-8853

Polycrystalline manganese-zinc ferrite with lithium substitution of composition Li0.5xMn0.4Zn0.6-xFe2+0.5xO4 (0.0£ x £0.4) were prepared by the usual ceramic method. X-ray diffraction analysis confirmed that the samples have a spinel structure and are 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 1MHz) 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 1MHz-1GHz.