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초록
Barium oxide (BaO) was suggested as a scavenger material to mitigate the harmful siliceous intergranular phase in gadolinia-doped ceria (GDC). The addition of 1-5 mol % BaO to GDC specimens containing 500 ppm SiO2 enhanced the grain-boundary conduction by similar to 250 times. Transmission electron microscopy and electron probe microanalysis attributed this enhancement to the scavenging of the siliceous phase by the Ba-rich phase. In contrast, the grain-boundary conduction was significantly deteriorated when doped with 0.1-0.2 mol % BaO, which was attributed to the dissolution of BaO into the intergranular phase and the consequent increase in the ion-blocking effect at the grain boundary.
키워드
barium compounds; doping; electron probe analysis; gadolinium compounds; grain boundaries; silicon compounds; surface conductivity; transmission electron microscopy; YTTRIA-STABILIZED ZIRCONIA; GADOLINIA-DOPED CERIA; IMPEDANCE SPECTROSCOPIC ESTIMATION; ELECTRICAL-PROPERTIES; LIQUID-PHASE; TRIVALENT CATIONS; ALUMINA ADDITION; SILICEOUS PHASE; HIGH-PURITY; MICROSTRUCTURE
- 제목
- Improvement of Grain-Boundary Conduction in SiO2-Doped GDC by BaO Addition
- 저자
- Park, Seung-Young; Cho, Pyeong-Seok; Lee, Sung Bo; Park, Hyun-Min; Lee, Jong-Heun
- 발행일
- 2009
- 유형
- Article
- 권
- 156
- 호
- 8
- 페이지
- B891 ~ B896