The total electrical conductivity of A3+B3+O3-type perovskites (La1-xSrx)ScO3-δ (x = 0.1 and 0.2) was investigated under controlled atmospheres between 573 and 1273K. In the presence of water vapor and/or hydrogen, the perovskites exhibited predominantly proton conduction below 873 and 973K for x = 0.1 and 0.2, respectively. The x = 0.2 compound exhibited the higher proton conductivity of ca. 6 x 10−3S/cm at 873K. The x = 0.1 and 0.2 materials showed apparent activation energy for proton conduction between 573 and 723K of 0.54 and 0.55eV. The higher proton conductivity of the x = 0.2 perovskite was presumed to arise from a higher mobile proton concentration than that of the x = 0.1 compound.

Proton Conduction in Doped LaScO3 Perovskites. K.Nomura, T.Takeuchi, S.Kamo, H.Kageyama, Y.Miyazaki: Solid State Ionics, 2004, 175[1-4], 553-5