Details
| Original language | English |
|---|---|
| Title of host publication | Advances in Solid Oxide Fuel Cells VI - A Collection of Papers Presented at the 34th International Conference on Advanced Ceramics and Composites, ICACC |
| Publisher | American Ceramic Society |
| Pages | 81-89 |
| Number of pages | 9 |
| Edition | 4 |
| ISBN (print) | 9780470594698 |
| Publication status | Published - 27 Sept 2010 |
Publication series
| Name | Ceramic Engineering and Science Proceedings |
|---|---|
| Number | 4 |
| Volume | 31 |
| ISSN (Print) | 0196-6219 |
Abstract
Compounds Bi2-2xSr2xM4O9-x (M = Al, Ga, Fe) possessing mullite type structure could be interesting candidates for the use as electrolytes in SOFCs at intermediate temperatures (600-800°C). A central role for enhanced oxygen diffusion could be related to the vacancy formation on the site of bridging oxygen of M2O 7 units related to the effect of Sr doping. Polycrystalline samples of average crystal sizes between 20 and 500 nm were synthesized using precursor gels from corresponding nitrate-glycerin solutions. The systems were characterized using XRD, infrared absorption and SEM/EDX techniques. Oxygen tracer diffusion coefficients could be estimated from isotope exchange experiments at 800°C using well separated infrared absorption peaks for the bridging oxygen. The estimated oxygen diffusion coefficients turns out to be in the range 10-16 to 10-18 cm2/s for the basic systems and could not be improved with a nominal increase in Sr content, too. This could be explained by the fact that Sr could not be substituted as to form a thermodynamically stable single phase but shows a clear phase separation in acid leaching experiments.
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Materials Chemistry
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Advances in Solid Oxide Fuel Cells VI - A Collection of Papers Presented at the 34th International Conference on Advanced Ceramics and Composites, ICACC. 4. ed. American Ceramic Society, 2010. p. 81-89 (Ceramic Engineering and Science Proceedings; Vol. 31, No. 4).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Oxygen diffusion in Bi2M4O9 (M = Al, Ga, Fe) systems and the effect of Sr doping in Bi2-2xSr 2xM4O9-x studied by isotope exchange experiments and IR absorption
AU - Debnath, T.
AU - Rüscher, C. H.
AU - Gesing, Th M.
AU - Fielitz, P.
AU - Ohmann, S.
AU - Borchardt, G.
PY - 2010/9/27
Y1 - 2010/9/27
N2 - Compounds Bi2-2xSr2xM4O9-x (M = Al, Ga, Fe) possessing mullite type structure could be interesting candidates for the use as electrolytes in SOFCs at intermediate temperatures (600-800°C). A central role for enhanced oxygen diffusion could be related to the vacancy formation on the site of bridging oxygen of M2O 7 units related to the effect of Sr doping. Polycrystalline samples of average crystal sizes between 20 and 500 nm were synthesized using precursor gels from corresponding nitrate-glycerin solutions. The systems were characterized using XRD, infrared absorption and SEM/EDX techniques. Oxygen tracer diffusion coefficients could be estimated from isotope exchange experiments at 800°C using well separated infrared absorption peaks for the bridging oxygen. The estimated oxygen diffusion coefficients turns out to be in the range 10-16 to 10-18 cm2/s for the basic systems and could not be improved with a nominal increase in Sr content, too. This could be explained by the fact that Sr could not be substituted as to form a thermodynamically stable single phase but shows a clear phase separation in acid leaching experiments.
AB - Compounds Bi2-2xSr2xM4O9-x (M = Al, Ga, Fe) possessing mullite type structure could be interesting candidates for the use as electrolytes in SOFCs at intermediate temperatures (600-800°C). A central role for enhanced oxygen diffusion could be related to the vacancy formation on the site of bridging oxygen of M2O 7 units related to the effect of Sr doping. Polycrystalline samples of average crystal sizes between 20 and 500 nm were synthesized using precursor gels from corresponding nitrate-glycerin solutions. The systems were characterized using XRD, infrared absorption and SEM/EDX techniques. Oxygen tracer diffusion coefficients could be estimated from isotope exchange experiments at 800°C using well separated infrared absorption peaks for the bridging oxygen. The estimated oxygen diffusion coefficients turns out to be in the range 10-16 to 10-18 cm2/s for the basic systems and could not be improved with a nominal increase in Sr content, too. This could be explained by the fact that Sr could not be substituted as to form a thermodynamically stable single phase but shows a clear phase separation in acid leaching experiments.
UR - http://www.scopus.com/inward/record.url?scp=79952436022&partnerID=8YFLogxK
U2 - 10.1002/9780470943984.ch8
DO - 10.1002/9780470943984.ch8
M3 - Conference contribution
AN - SCOPUS:79952436022
SN - 9780470594698
T3 - Ceramic Engineering and Science Proceedings
SP - 81
EP - 89
BT - Advances in Solid Oxide Fuel Cells VI - A Collection of Papers Presented at the 34th International Conference on Advanced Ceramics and Composites, ICACC
PB - American Ceramic Society
ER -