Crystal structure of cerium oxide doped with rare earth elements

Abstract

Cerium oxide doped with Y, Gd, and Nd was prepared by coprecipitation method and was studied by x-ray diffraction. They formed solid solutions in wide range of concentration. Crystal structure of the solid solution was fluorite at low concentrations of additives and then changed to rare earth C-type structure at higher concentrations. The lattice parameter of CeO₂-NdO_1.5 increased as the concentration of Nd increased. However, the lattice parameters of other systems behaved differently.