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Grain boundary blocking of ionic conductivity in nanocrystalline yttria-doped ceria thin films

Title
Grain boundary blocking of ionic conductivity in nanocrystalline yttria-doped ceria thin films
Author
김영범
Keywords
Yttria-doped ceria; Grain boundaries; Ionic conductors; Nanocrystalline materials; Solid oxide fuel cell
Issue Date
2015-07
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
SCRIPTA MATERIALIA, v. 104, Page. 45-48
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. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S135964621500130Xhttp://hdl.handle.net/20.500.11754/26173
ISSN
1359-6462
DOI
10.1016/j.scriptamat.2015.03.020
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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