The effects of ZnO additive on the microstructure, phase formation, and electrical conduction of yttrium‐doped strontium zirconate were investigated. The sintering temperature of SrZr0.9Y0.1O2.95 can be lowered to 1350°C by addition of ZnO. The electrical conduction is found to be strongly correlated with the ZnO contents. When the ZnO content is <5 mol%, the electrical conductivity increased with an increase in the ZnO contents. Electromotive force measurements under fuel cell conditions indicated a pure ionic conduction over this range of ZnO contents. However, it had a detrimental effect on the electrical conduction when the ZnO content was more than 6 mol%. The main reason for this is discussed according to the defect chemistry and microstructure.
Heterogeneous composite BaZr 0.1 Y 0.9 O 2.95 /Na 2 SO 4 was designed and fabricated with Y-doped BaZrO 3 as matrix and Na 2 SO 4 as dispersant by conventional powder processing to improve the total conductivity of barium zirconate. The electrical conduction of the composite was studied by electrical and electrochemical methods. Microstructure of the heterogeneous composite was examined by SEM. The experimewtal results show that the protonic conductivity of Y-doped BaZrO 3 is greatly improved upon incorporating Na 2 SO 4 in the material. Microstructure observation indicates that a multiphase structure with Na 2 SO 4 disperses at the grain boundaries of BaZr 0.1 Y 0.9 O 2.95 . Electromotive force (EMF) measurements under fuel cell conditions reveal that the total ionic transport number of the composite is more than 0.9 at 750 ℃.
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