Abstract
The effects of microstructure on the kinetics of strontium segregation in La0.6Sr0.4CoO3-δ ceramic samples are investigated. A faster segregation of the Sr cations towards the surface was observed after annealing for 1 h at 600°C in dry oxygen (pO2 = 200 mbar) as the density of grain boundaries at the surface increases (i.e. with a decrease of the grain size). The presence of surface impurities, such as Na, partially inhibits the Sr segregation towards the surface. Optical micrographs and ToF-SIMS chemical imaging showed that the segregation and precipitation of Sr starts at the grain boundaries, with an apparent enrichment of the surface around the grain boundary via Sr surface diffusion.
| Original language | English |
|---|---|
| Title of host publication | Ionic and Mixed Conducting Ceramics 10 |
| Editors | X. D. Zhou, M. B. Mogensen, T. M. Gur, T. Kawada, A. Manivannan |
| Publisher | Electrochemical Society Inc. |
| Pages | 57-69 |
| Number of pages | 13 |
| Edition | 7 |
| ISBN (Electronic) | 9781607685395 |
| DOIs | |
| Publication status | Published - Jan 1 2016 |
| Event | Symposium on Ionic and Mixed Conducting Ceramics 10 - 229th ECS Meeting - San Diego, United States Duration: May 29 2016 → Jun 2 2016 |
Publication series
| Name | ECS Transactions |
|---|---|
| Number | 7 |
| Volume | 72 |
| ISSN (Print) | 1938-6737 |
| ISSN (Electronic) | 1938-5862 |
Other
| Other | Symposium on Ionic and Mixed Conducting Ceramics 10 - 229th ECS Meeting |
|---|---|
| Country | United States |
| City | San Diego |
| Period | 5/29/16 → 6/2/16 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
Cite this
Effects of microstructure on surface segregation : Role of grain boundaries. / Téllez, H.; Druce, J.; Ishihara, T.; Kilner, J. A.
Ionic and Mixed Conducting Ceramics 10. ed. / X. D. Zhou; M. B. Mogensen; T. M. Gur; T. Kawada; A. Manivannan. 7. ed. Electrochemical Society Inc., 2016. p. 57-69 (ECS Transactions; Vol. 72, No. 7).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Effects of microstructure on surface segregation
T2 - Role of grain boundaries
AU - Téllez, H.
AU - Druce, J.
AU - Ishihara, T.
AU - Kilner, J. A.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - The effects of microstructure on the kinetics of strontium segregation in La0.6Sr0.4CoO3-δ ceramic samples are investigated. A faster segregation of the Sr cations towards the surface was observed after annealing for 1 h at 600°C in dry oxygen (pO2 = 200 mbar) as the density of grain boundaries at the surface increases (i.e. with a decrease of the grain size). The presence of surface impurities, such as Na, partially inhibits the Sr segregation towards the surface. Optical micrographs and ToF-SIMS chemical imaging showed that the segregation and precipitation of Sr starts at the grain boundaries, with an apparent enrichment of the surface around the grain boundary via Sr surface diffusion.
AB - The effects of microstructure on the kinetics of strontium segregation in La0.6Sr0.4CoO3-δ ceramic samples are investigated. A faster segregation of the Sr cations towards the surface was observed after annealing for 1 h at 600°C in dry oxygen (pO2 = 200 mbar) as the density of grain boundaries at the surface increases (i.e. with a decrease of the grain size). The presence of surface impurities, such as Na, partially inhibits the Sr segregation towards the surface. Optical micrographs and ToF-SIMS chemical imaging showed that the segregation and precipitation of Sr starts at the grain boundaries, with an apparent enrichment of the surface around the grain boundary via Sr surface diffusion.
UR - http://www.scopus.com/inward/record.url?scp=85010650791&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85010650791&partnerID=8YFLogxK
U2 - 10.1149/07207.0057ecst
DO - 10.1149/07207.0057ecst
M3 - Conference contribution
AN - SCOPUS:85010650791
T3 - ECS Transactions
SP - 57
EP - 69
BT - Ionic and Mixed Conducting Ceramics 10
A2 - Zhou, X. D.
A2 - Mogensen, M. B.
A2 - Gur, T. M.
A2 - Kawada, T.
A2 - Manivannan, A.
PB - Electrochemical Society Inc.
ER -