The role of Ba concentration on the structural characteristics and electrical conductivities of BaxCe0.9Y0.1O3-α

BaxCe0.9Y0.1O3-α(x = 0.85 ∼ 1.10) perovskite oxides were prepared, the XRD data reveals that, the raw material CeO2 were found in the specimens, while the contents of Ba x below 1. According to the data of SEM and EDS, the grain interiors size of BaxCe0.9Y0.1O3-α increase with Ba content increasing and none of Ba, Ce, Y enrichment around grain boundaries are observed. At 300 ∼ 900 °C, the total conductivities σtot and bulk conductivities σb of Ba1.05Ce0.9Y0.1O3-α are the highest among these samples. The specific grain boundary conductivities σs.p.g.b of BaxCe0.9Y0.1O3-α increases with the increasing of Ba concentration, when the Ba content x is lower than 1.00, and σs.p.g.b vary little with Ba content x, when x is higher than 1.00. In humidity air, the bulk conduction of BaxCe0.9Y0.1O3-α is mostly OHO
- conduction, the s.p.g.b. conduction of BaxCe0.9Y0.1O3-α may be OHO
- , VO
-
- and h
- mixture conductions.