Navegando por Autor "Melo, Marcus Antônio De Freitas"

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Characterization and thermal behavior of PrMO3 (M = Co or Ni) ceramic materials obtained from gelatin
(Elsevier, 2012-09) Aquino, Flávia de Medeiros; Melo, Dulce Maria de Araújo; Pimentel, Patrícia Mendonça; Braga, Renata Martins; Melo, Marcus Antônio De Freitas; Martinelli, Antonio Eduardo; Costa, Asenete Frutuoso
Metal oxides with perovskite-type structure have attracted considerable interest in recent years due to their magnetic and electrical properties, as well as their catalytic activity. In this study, oxides with PrNiO3 and PrCoO3 composition were prepared by using gelatin powder as a precursor agent for its use as a catalyst. The powders obtained were calcined at 700 8C and 900 8C and characterized using the X-ray diffraction, thermal analysis (thermogravimetry and differential thermal analysis), infrared spectrosco- py, temperature programed reduction and scanning electron microscopy techniques. Thermogravimetric data using the non-isothermal kinetic models of Flynn and Wall and ‘‘Model-free Kinetics’’ were used to determine the activation energy to study the decomposition kinetics of the ligand groups with system’s metallic ions that takes part in the synthesis of PrMO3 (M = Ni or Co)

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