Recent studies on the solubility of Gd 2 O 3 in CeO 2 and high-temperature aging behavior of solid solutions Ce 1 − x Gd x O 2 − δ ( 0.05 ⩽ x ⩽ 0.4 ) are presented. X-ray diffraction analysis indicated that 1600°C sintering was sufficient to ensure the dissolution of Gd 2 O 3 into CeO 2 to form solid solutions. High-temperature aging at 1000°C showed a significant effect on the electrical conductivities of the Ce 1 − x Gd x O 2 − δ ceramics. For the compositions x < 0.2 , high-temperature aging led to an increase in the total conductivity resulting mainly from an improved grain boundary behavior. However, for the compositions x > 0.2 , high-temperature aging had a detrimental effect on both the grain interior and grain boundary conductivities. The grain interior and grain boundary conductivities of the Ce 0.75 Gd 0.25 O 2 − δ ceramic were reduced by 30 and 44%, respectively, as a result of high-temperature aging at 1000°C for 8 days. The aging behavior of doped ceria cannot be explained using the mechanisms applied to doped zirconia.
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