Microstructural and electrical characterization of La(Fe_xni_1-x)O₃ synthesized by the methos of gelatin

Full text: The present work deals with the synthesis of materials with perovskite structure . The perovskite type materials were obtained by chemical synthesis method, using gelatin as the substituent of citric acid and ethylene glycol, acting as polymerizing and chelating agent. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), term reduction program (TPR) and infrared spectroscopy (FTIR). The compounds were also characterized by electrical conductivity for the purpose of observing the possible application in solid oxide fuel cell (SOFC) [1] . The method using gelatin and polymerizing chelating agent for the preparation of materials with the perovskite structure allows the synthesis of crystalline materials and homogeneous. The distorted perovskite structure have obtained the type orthorhombic and rhombohedral, important for application in fuel cells [2]. The presentation material properties required of a candidate materials for fuel cells. XRD analysis contacted by the distortion of the structures of the synthesized materials. The analyzes show that the electrical conductivity obtained materials have the potential to act as a cell to the cathode of solid oxide fuel. It can be concluded that the activity of these perovskites is due to the presence of structural defects generated that depend on the method of synthesis and the subsequent heat treatment. References: [1] AMANDO, R. S.; MALTA, L. F. B.; GARRIDO, F. M. S.; MEDEIROS, M. L., 2007; 'Pilhas a combustível de óxido sólido: materiais, componentes e configurações'. Química Nova, vol. 30, n. 1, pp 189-197. [2] WEI, Z. X.; XU Y. Q.; LIU H. Y.; HU C. W., 2009; 'Preparation and catalytic activities of LaFeO₃ and Fe₂O₃for HMX'. Journal of Hazardous Materials, 165, pp 1056-1061. (author)