ELECTROLYTIC DOMAIN BOUNDARY BETWEEN IONIC AND ELECTRONIC CONDUCTION OF DOPED CERIA

The electrolytic domain boundary (EDB) of doped ceria between ionic an d electronic conduction is theoretically investigated with the conside ration of defect association. Data from the early reports on EDB of si ngly, double and triply doped ceria are summarized and interpreted bas ed on the theoretical investigation. It is proposed that samarium and gadolinium among the rare earth elements are mostly suitable for the m ain dopants of ceria, while further minor additions of other elements can benefit the improvement of the EDB.