Structural Characterization of sol-gel lanthanum cobaltite thin films

The present paper is focused on structural, microstructural and compositional studies on nanophasic LaCoO3 thin films obtained by the sol-gel route. The sample structure and microstructure were investigated by Glancing Incidence X-Ray Diffraction (GIXRD) and X-Ray microdiffraction (MicroXRD), whereas the surface and in-depth chemical composition was studied by X-Ray Photoelectron Spectroscopy (XPS). All the films are structurally homogeneous and not textured. A cubic-to-rhomboedral phase transition was detected after the thermal treatment at 800°C. Evidence of residual stress was found by GIXRD patterns collected at different incidence angles. After thermal annealing at 1000°C, only the crystalline La2O3 phase was detected.