The electrical properties of Y2O3-doped CeO2-rich ZrO2–CeO2 system were characterized with a viewpoint of its point-defect structural scheme. Theoretical calculation of partial electronic and ionic conductivity from total conductivity was done to investigate the combined homovalent and aliovalent doping effect on the overall electrolytic property. According to these results, combined homovalent and aliovalent doping could be one of the key solutions to overcome the fatal disadvantage of limited electrolytic stability of doped ceria system by which properly enhanced the ionic conductivity and suppressed the electronic conductivity all at once.

Characterization of the Electrical Properties of Y2O3-Doped CeO2-Rich CeO2–ZrO2 Solid Solutions. J.H.Lee, J.Kim, S.W.Kim, H.W.Lee, H.S.Song: Solid State Ionics, 2004, 166[1-2], 45-52