The influence of bismuth addition on the local structure of CeO_2

摘要

The local structure of mixed oxides with the composition Ce_(1-x)Bi_xO_y, where x = 0.1-0.5, y < 2 was studied by EXAFS and X-ray radial distribution of electronic density method. It is shown, that samples represent single-phase systems of solid solutions with the structure close to that of CeO_2. The unit cell parameter increases and disorder of the structure takes place with bismuth content increasing: modification of interatomic distances, distortion in the cation sublattice, and arising of oxygen vacancies in anion sublattice.