Influence of type of precursors on the sol-gel synthesis of the LaCoO₃ nanoparticles

Abstract

Perovskite-type LaCoO3 was prepared by sol-gel method using nitrates / chlorides as precursors and citric acid as chelating agent. Chemical composition was obtained by means of EDX method. The structures of sintered samples were investigated by scanning electron microscopy (SEM), IR and XRD analysis. The results of X-ray diffraction indicated that the LaCoO3nanopowders obtained using nitrate as precursors had a rhombohedral perovskite-type crystal structure (S. G: R-3c), while that obtained using chloride as precursors had a mixture of LaCoO3, LaOCl and Co3O4. The all lanthanum cobaltites exhibit catalytic activity on the decomposition of hydrogen peroxide, ascribed to their higher surface and Co3+ concentration

Characteristics of Nano-Size LaCrO3 Prepared Through Sol-Gel Route Using Pectin as Emulsifying Agent

“…Several compounds that have been tested as modifying agents are citric acid 44,45 , glycine nitrate 46 , and ammonium carbonate 47 . In general, it was reported that the use of modifier in sol-gel process resulted in better characteristics of solid products, compared to those of the products produced without modifier, such as more homogeneous surface, smaller particle size, and narrower particle size distribution.…”