In this paper, NiZnCo ferrite was produced by solid state synthesis,
calcination at 1000?C and sintering at 1250?C in air atmosphere. The
microstructure and phases of the sintered sample were analysed by scanning
electron microscopy and X-ray diffraction, respectively. The magnetic
properties of the ferrite were evaluated by magnetization and
magnetostriction measurements. The complex magnetic permeability and complex
permittivity were also measured between 1MHz-12GHz and the reflection loss
(RL) was calculated in the 100MHz-12GHz frequency range. The results show
that the ferrite sample presents magnetostrictive behaviour and a saturation
magnetization of 71 Am2/kg. Complex permittivity measurements indicate that
the material has dielectric behaviour in the whole frequency range studied,
with "? varying between 7-40, and magnetic behaviour in frequencies between
1MHz-5GHz. The minimum RL was found at frequencies between 2.4-3.3GHz and
the calculated RL value for a thickness of 3mm was lower than ?10 dB in
frequencies between 2.3-7.3GHz. These results indicate potential application
as microwave absorber in the S band.
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