The conductivity of Sm-substituted material was investigated by using electrochemical methods. The addition of Sm tended to increase the concentration of interstitial oxide ions and enhanced the ionic conductivity. The charge carrier in the substituted phase was the oxide ion, and the enhanced conductivity which was due to the oxide ion was almost the same as that previously reported for the La-substituted phase.

T.Esaka, R.Tachibana, S.Takai: Solid State Ionics, 1996, 92[1-2], 129-33