A low temperature route to prepare LaFeO_3 and LaCoO_3

摘要

A combination of digestion and further low temperature calcination to crystallize the product was employed to prepare LaFeO_3 (LF) and LaCoO_3 (LC) powders. Freshly co-precipitated lanthanum and ferric (or cobalt) hydroxide gels by sodium hydroxide were allowed to react at 100℃ under refluxing and stirring conditions for 4-6 h. These oven dried powders were heated at 450℃ to form crystalline LF (or LC) powders. The phase contents and lattice parameters were investigated by X-ray diffraction (XRD). Transmission electron microscope (TEM) investigations were carried out to examine the morphology and average particle size of these powders.