Preparation, thermal expansion, electrical conductivity and polarization of La0.6Sr0.4Co1−xGaxO3−δ (LSCG) (x = 0.0 to 0.4) were studied. For x-values of up to 0.4, hexagonally distorted perovskite single phase of La0.6Sr0.4Co1−xGaxO3−δ was obtained. Thermal expansion coefficients of the specimens with x < 0.3 exhibited higher values than those of electrolyte materials, such as Ce0.8Gd0.2O1.9 or La0.8Sr0.2Ga0.85Mg0.15O2.825, whereas those of specimens with x = 0.3 had similar values. The electrical conductivity decreased with increasing Ga content; however, the conductivity for x = 0.4 was still in the order of 102S/cm at 800C. Polarization measurements showed that cathode performance decreased with increasing Ga content; however, the sample with x = 0.4 still had sufficient activity as a new cathode material of ITSOFC.

Preparation, Thermal Expansion and Electrical Conductivity of La0.6Sr0.4Co1−xGaxO3−δ (x = 0.0–0.4) as a New Cathode Material of SOFC. S.Wang, R.Zheng, A.Suzuki, T.Hashimoto: Solid State Ionics, 2004, 174[1-4], 157-62