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+
