Structural and electrical study of LaCrO3 modified with Fe and Co

[摘要] The present work shows the effect of a modification on LaCrO3oxide using Fe and Co cations over the structural and electrical properties in order to evaluate its response to applications as electrode in solid oxide fuel cells (SOFC). The LaCr0.8Fe0.2O3and LaCr0.6Co0.2Fe0.2O3oxides were synthetized by polymerization-combustion method using citric acid as complexing agent. The characterizations by means of X-ray diffraction (XRD), energy dispersive X-ray (EDX), and Raman spectroscopy revealed the conformation of a LaCrO3single phase with an orthorhombic structure (Pnma 62) in both ceramics and average crystal size of 131nm. The images of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) confirmed the conformation of materials with relevant morphological characteristics obtained because of synthesis method used. Analysis by Impedance spectroscopy (IS) from room temperature to 800°C, indicated that both oxides were semiconductor type in accordance to thermal activation process.

[发布机构] Universidad Pedagógica y Tecnológica de Colombia, Tunja, Colombia^1;Universitat Jaume i, Castellón de la Plana, Spain^2

[效力级别] 化学

[关键词] Electrical studies;Energy dispersive x-ray;Impedance spectroscopy;Morphological characteristic;Orthorhombic structures;Semiconductor-type;Structural and electrical properties;Thermal activation process