Structural characterization of the CeO2/Gd2O3 mixed system by synchrotron X-ray diffraction

► A structural study of Ce-Gd mixed oxides has been performed. ► In (Ce1−xGdx)O2−x/2 a solid solution forms for 0≤x≤0.3. ► For x>0.3 a gradual transition from the C to the F structure is observed. ► Lattice parameters do not follow Vegard's law.