SANTOS, R. L. P.; http://lattes.cnpq.br/5592223576640611; SANTOS, Rafaela Luiz Pereira.
Resumo:
In the field of magnetic ceramics, in particular the Mn-Zn ferrites have grown
commercially due to their properties such as high magnetic saturation and the
possibility of application at high frequencies with low magnetic losses. However,
these ceramics exhibit magnetic properties that are sensitive to their structure
and morphology, and depend mainly on the processing conditions. Thus, the
aim was to study the influence of glycine and urea fuels, and the dilution in the
synthesis of ferrites Mn0 . 6 5Zn0 3 5Fe204 in the proportions 1:0 (undiluted), 1:3,5,
1:7, 1: 1:14 and 10 total reagent (RT): 100 mL of distilled water. The results
show that the samples synthesized with glycine, the increase in dilution favored
the production of single-phase samples and greater particle size and / or
clusters, and this contributed to the increase of the magnetic properties. For
samples synthesized with urea, for all dilutions was evaluated the formation of
Mn-Zn ferrite phase with traces of hematite. Increasing the dilution did not
significantly alter the structure, morphology and magnetic behavior of the
samples. For samples synthesized with glycine the best result was observed for
the magnetic sample diluted in the ratio 1:14 showed that saturation
magnetization 64 emu/g and coercive field 0.183 KOe. For the urea sample the
best result was obtained by magnetic sample without dilution ratio 1.0 showed
that saturation magnetization coercive field 51 emu/g e 0.134 KOe. In general,
analyzing the type of fuel, the best results were obtained for samples
synthesized with glycine.