X-Ray Photoelectron Spectrascopy Investigation of Ceria Doped with Lanthanum Oxide

The influence of doping lanthana on valent state of CeO₂ surface has been studied by using x-ray photoelectron spectrascopy It was found that La³⁺ doping in host CeO₂lattice can promote to convert Ce⁴⁺ into Ce³⁺ and enhance adsorbing-carbonyl capacity of the materials. However, the inversion of Ce⁴⁺ to Ce³⁺ is depressed by dopant La³⁺ during argon ion bombardment.