Estudo das propriedades magnéticas das ferritas ZnxMg1- xFe2O4 sintetizadas pelo método da reação de combustão
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Data
2010-08-13
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Universidade Federal de Goiás
Resumo
The ferrites have been studied systematically, due to their dielectric
and magnetic properties, being used in various applications in industry
such as core processors, catalysts.
In this work, we synthesized and characterized ferrites ZNXMg(1-x)
Fe2O4, where 0≤x≤0.8, by the method of combustion reaction. This
method have been used to produce ferrites quickly and inexpensively for
producing ferrites quickly and inexpensively. The following chemical were
used in the synthesis: iron nitrate Fe(NO3)3.9H2O, magnesium nitrate Mg
(NO3)3.6H2O, zinc nitrate Zn(NO3)3.6H2O and urea CO(NH2)2 as fuel. The
obtained ferrites were analysed by atomic absorption spectroscopy, X-ray
diffraction (XRD) spectroscopy, Fourier transform infrared (FTIR) and
vibrating sample magnetometer (VSM).
The results of atomic absorption spectroscopy showed that the
samples were synthesized with stoichiometry close to the calculated. The Xray
diffraction showed that there was the formation of the spinel phase,
typical of ferrites, the crystallite size varied from 37nm to x = 0.8 and 55 nm
for x = 0.4. Infrared spectroscopy showed absorption bands typical of spinel
type ferrites. The magnetic saturation, coercivity and remanent magnetization
varied with the amount of zinc.
The x=0,4 zinc ferrite had a maximum of magnetic saturation of 246.4
(emu/cm3) for x = 0.4 zinc. The value of coercivity and remnant
magnetization decreased with the replacement of magnesium by zinc. The
coercivity ranged from 82.0 (Oe) for x = 0,0 to 3.8 (Oe) for x = 0.8 and the
remnant magnetization ranged from 17.0 (emu/cm3) for x = 0.0 to 0.3
(emu/cm3) for x = 0.8. The Curie temperature decreased with the
replacement of magnesium by zinc, and the Curie temperature of ferrite,
magnesium MgFe2O4, was 750 K.
Descrição
Citação
SILVA, Marcelo dos Santos. Study of magnetic properties of ferrite-ZnxMg1
xFe2O4 synthesized by the method of combustion reaction. 2010. 71 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de Goiás, Goiânia, 2010.