Preparação e cracterização de compósitos de CoFe2O4/ZrO2
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2016-04-05
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Universidade Federal de Goiás
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In this work, structural, morphological and magnetic properties of cobalt
ferrite/zirconium oxide composites prepared via mechanical mixing of the powders
were evaluated. Cobalt ferrite powders were obtained by coprecipitation, and some
synthesis parameters were optimized, such as the speed of stirring , the concentration
of base and metal solutions, in order to obtain stoichiometric ferrites (Fe3+/Co2+ = 2:
1) or near to it. Zirconium oxide powders were synthesized via sol-gel. The
composites were analyzed by Atomic Absorption, Field Emission Scanning Electron
Microscopy and Spectroscopy Dispersive Energy, Diffraction of X-rays, Infrared
Spectroscopy and Vibranting Sample Magnetometry. It was observed the migration
of cations between the ferrite and zirconia structures as a result of high diffusion
between phases due to heat treatment. The analysis by Field Emission Scanning
Electron Microscopy and Spectroscopy Dispersive Energy showed the different
microstructures of aggregates present in the composites and the average diameter of
the grains. The insertion of a magnetic phase on a non-magnetic matrix caused an
increase in the saturation magnetization and the remanent magnetization, and
decrease in coercivity as the cobalt ferrite content increases.
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MACIEL, S. A. Preparação e cracterização de compósitos de CoFe2O4/ZrO2. 2016. 84 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2016.