Grain boundary blocking of ionic conductivity in nanocrystalline yttria-doped ceria thin films
- Authors
- An, Jihwan; Bae, Jiwoong; Hong, Soonwook; Koo, Bongjun; Kim, Young-Beom; Guer, Turgut M.; Prinz, Fritz B.
- Issue Date
- Jul-2015
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Yttria-doped ceria; Grain boundaries; Ionic conductors; Nanocrystalline materials; Solid oxide fuel cell
- Citation
- SCRIPTA MATERIALIA, v.104, pp.45 - 48
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCRIPTA MATERIALIA
- Volume
- 104
- Start Page
- 45
- End Page
- 48
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/156882
- DOI
- 10.1016/j.scriptamat.2015.03.020
- ISSN
- 1359-6462
- Abstract
- Nanocrystalline YDC thin films with grain-sizes ranging from 38 to 93-nm were prepared using pulsed laser deposition followed by thermal annealing. Ionic conductivity decreased up to four orders of magnitude as the grain size increased. Using energy-dispersive X-ray spectroscopy, we showed that the counter-intuitive reduction in conductivity with grain-size is likely due to dopant and impurity segregation near grain-boundaries. Spectroscopic evidence suggests that the blocking effect due to defect segregation is more dominant on ionic conductivity than the grain-sizes.
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