Dense Ce 0.8 Gd 0.2 O 2−δ was sintered by pulsed current activated sintering (PCAS) within 6min from Ce 0.8 Gd 0.2 O 2−δ nanopowder prepared by co-precipitation method. Sintering was accomplished under the combined effects of a pulsed current and mechanical pressure. Highly dense Ce 0.8 Gd 0.2 O 2−δ with relative density of up to 96.3% was produced under simultaneous application of an 80-MPa pressure and the pulsed current. The effects of Fe 2 O 3 additions on the sintering behavior, ionic conductivities, and mechanical properties of the Ce 0.8 Gd 0.2 O 2−δ were investigated.