Characterization and thermal behavior of PrMO{sub 3} (M = Co or Ni) ceramic materials obtained from gelatin

• Published in: Materials research bulletin 2012-09, Vol.47 (9)
• Main Authors: Aquino, F.M., Melo, D.M.A., Pimentel, P.M., Braga, R.M., Melo, M.A.F., Martinelli, A.E., Costa, A.F.
• Format: Article
• Language: English
• Subjects: ABSORPTION SPECTROSCOPY; ACTIVATION ENERGY; CALCINATION; CATALYSIS; CATALYSTS; CERAMICS; DIFFERENTIAL THERMAL ANALYSIS; ELECTRICAL PROPERTIES; GELATIN; INFRARED SPECTRA; MAGNETIC PROPERTIES; MATERIALS SCIENCE; NANOSTRUCTURES; ORGANIC MATTER; OXIDES; PEROVSKITE; SCANNING ELECTRON MICROSCOPY; SYNTHESIS; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/J.MATERRESBULL.2012.04.078

Graphical abstract: The micrograph in figure shows sample calcined at temperature 900 °C. The sample exhibits morphology with considerable porosity and the formation of agglomerated nanometric particles. Gelatin provides the system with a large amount of organic matter, which is then removed during calcinations, favoring the appearance of pores in the material. Highlights: ► Oxides with PrNiO{sub 3} and PrCoO{sub 3} were prepared by new method synthesis. ► The gelatin, through its carboxylate groups and amine, is an efficient director. ► The obtained materials have magnetic properties and application in catalysis. ► The decomposition kinetic study of bonding groups of gelatin with metallic ions that takes part in the synthesis of PrMO{sub 3}. -- Abstract: 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 PrNiO{sub 3} and PrCoO{sub 3} composition were prepared by using gelatin powder as a precursor agent for its use as a catalyst. The powders obtained were calcined at 700 °C and 900 °C and characterized using the X-ray diffraction, thermal analysis (thermogravimetry and differential thermal analysis), infrared spectroscopy, 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 PrMO{sub 3} (M = Ni or Co).