An oxalate co-precipitation method was used to prepare rare-earth doped ceria powders of the form, Ce0.8R0.2O1.9, where R was Yb, Y, Gd, Sm, Nd or La. Powders which had been calcined at 600C were isostatically compacted and sintered at 1600C in air to obtain a relative density of above 98%. The conductivity of the doped ceramics was dominated by the migration of O ions in the bulk, and ranged from 6.7 to 13.6S/m at 800C.

Electrical Conductivity and Diffusion of Oxygen Ions in Rare-Earth-Doped Ceria. S.Sameshima, H.Ono, K.Higashi, K.Sonoda, Y.Hirata, Y.Ikuma: Journal of the Ceramic Society of Japan, 2000, 108[12], 1060-6