INFLUENCE OF A-SITE COMPOSITE DOPING ON CHEMICAL DIFFUSION COEFFICIENT OF PEROVSKITE OXIDES (La1-xPrx)2/3 Sr1/3Co0.8Ni0.2O3

摘要

Perovskite oxides (La1-xPrx)2/3Sr1/3Co0.8Ni0.2O3 (LPSCN,x=0.2,0.4,0.6,0.8) were synthesized by solid state-reaction method. Electrical conductivity relaxation method was used to determine the oxygen chemical diffusion coefficients chem D. The results indicate that the LPSCN samples have high oxygen chemical diffusion coefficients, which increase gradually with the decreasing of content Pr and the rising of temperature. The relation of conductivity and oxygen partial pressure is n P2 刦 冦. The conductivity increases with the reducing of content Pr and the decreasing of temperature. The oxygen chemical diffusion coefficient chem D of LPSCN-82 is 1.18⊙10-4cm2s-1at 800. The max conductivity of the specimen of LPSCN-82 is 974.74 S.cm-1 at 500 under 1.00bar oxygen partial pressure. The specimen of LPSCN-82 show good cathode materials, and were used for our intermediate temperature solid oxide fuel cells development.