Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1297667 | Solid State Ionics | 2006 | 6 Pages |
Abstract
We have synthesized the perovskite oxides of the (Ba0.3Sr0.2La0.5)(In1âxFex)O3âδ system and measured the total electrical conductivity as a function of temperature and oxygen partial pressure. It was found that the single-phase composition region extended from x = 0.0 to x = 1.0, and that the Fe valence increased from 3.06 to 3.50 in that region. The electrical conductivity was semiconducting from x = 0.0 to x = 0.40 and metallic from x = 0.50 to x = 1.0. The total electrical conductivity at 800 °C also increased with the Fe content and achieved a maximum value of 140 (S/cm) at x = 1.0. From the dependence of the electrical conductivity on the oxygen partial pressure, we conclude that above x = 0.50, the majority carriers are holes. The estimated hole conductivity increased exponentially with the amount of Fe4+ cation present. The oxide ion conductivity was dependent on the oxygen vacancy content.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Katsuyoshi Kakinuma, Keiji Yamakawa, Sayaka Hasunuma, Hiroshi Yamamura, Tooru Atake,