EFFECTS OF TRIVALENT DOPANTS ON THE REDOX PROPERTIES OF CE0.6ZR0.4O2 MIXED-OXIDE

We have observed that the insertion of trivalent cations into the latt ice of Ce0.6Zr0.4O2 solid solution improves the oxygen storage capacit y at low temperatures by decreasing the temperature of the reduction i n the bulk of the solid solution compared to the undoped sample. The e ffect depends on the type of dopant and its concentration. Reduction o f the solid solution at moderate temperatures is strongly improved upo n aging in H-2/Ar independently of the extensive sintering of the samp le. (C) 1997 Academic Press.