Segregation of aliovalent cations to the grain boundaries is reported to play a key role on the high-temperature plasticity of yttria-doped zirconia polycrystals. The role of such segregation on yttria-doped zirconia nanocrystals is still an open question. In order to go further into this problem, a systematic study of the high-temperature plasticity of ceria-doped zirconia polycrystals and nanocrystals has been carried out. Segregation of cerium cations to the grain boundaries should play no role regarding the mechanical behaviour due to the isovalency of zirconium and cerium. Therefore, this is an optimal system to explore the intrinsic behaviour of zirconia ceramics, segregation effects being removed. Preliminary results as well systematic tendencies will be confronted to the existing models in literature.

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