Perovskites of the form, BaCe0.8Ln0.2O3 (where Ln was La, Sm, Gd or Yb), exhibited ionic conductivities which were greater than 4 x 10-4S/cm at 225C and were greater than 10-6S/cm at 125C. Arrhenius plots of the conductivities gave straight lines; thus indicating that the main charge carriers in the 4 types of oxide remained unchanged at 25 to 300C. The charge carriers were deduced, from steady hole currents in a N atmosphere and alternating-current conductivity data, to be almost entirely oxide ions.

Oxide-Ion Conductivity of BaCeO3-Based Electrolytes at Low Temperatures. S.Koga, H.Amasaki, T.Eguchi, T.Hijii, Y.Saito, J.Kuwano: Key Engineering Materials, 2000, 181-182, 187-90