Avaliação dos combustíveis uréia e glicia na síntese por reação de combustão de ferrita Mn0, 65Zn0, 35Fe, O4.

Abstract

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.