THE EFFECT OF THERMAL-TREATMENT ON THE RESISTANCE OF LSCF ELECTRODES ON GADOLINIA DOPED CERIA ELECTROLYTES

The effect of thermal treatment on the structure and electrical charac teristics of La1-xSrxFe1-yCoyO3-delta (LSCF) electrodes on Ce0.9Gd0.1O 1.95 (CGO) electrolytes has been investigated. Low calcination tempera tures and short sintering times leads to the formation of a cubic A-si te deficient perovskite, with the composition La0.6Sr0.13Co0.2Fe0.8O2. 52, which exhibits a low electrode resistance. Higher calcination temp eratures and longer sintering times leads to the incorporation of stro ntium, derived from the decomposition of SrCO3, into the perovskite st ructure, producing a stoichiometric rhombohedral perovskite. Electrode s containing a larger proportion of the stoichiometric perovskite had a higher resistance than those consisting largely of the A-site defici ent perovskite.