Influence of Cu on the properties of gadolinium-doped barium cerate

✍ Scribed by E. Gorbova; V. Maragou; D. Medvedev; A. Demin; P. Tsiakaras

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 551 KB
• Volume: 181
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2007.11.049

✦ Synopsis

In the present work the effect of copper oxide addition on the densification behavior and electrical conductivity of BaCe 1-x Gd x O 3-δ (BCG) type ceramics is investigated. Small addition (1 mol%) of this sintering additive reduces both the calcination temperature (by ∼250 • C) and the sintering temperature (by ∼150 • C) and promotes at the same time the densification process. According to the X-ray diffraction analysis the BaCe 1-x Gd x O 3-δ samples with 0 ≤ x ≤ 0.2 and the BaCe 0.9-y Gd 0.1 Cu y O 3-δ samples with 0.0075 ≤ y ≤ 0.07 are single-phase. It was found that the samples with Cu, when sintered at 1450 • C for 3 h, have ∼95% of relative density compared with pure BaCe 0.9 Gd 0.1 O 3-δ samples that have ∼86%. It was also found that the electrical conductivity of Cu-containing samples sintered at 1450 • C is comparable to those without Cu sintered at 1600 • C in oxidizing and reducing atmospheres. Cu-containing samples exhibit significantly higher conductivity in both air and hydrogen atmosphere.