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タイトル: Correlation between Phase Behavior and Electrical Conductivity of 10 mol % Y-Doped BaZrO₃: An Anomalous Dispersion Effect-Aided Synchrotron Radiation XRD Study Combined with TEM Observation and Electrochemical Analysis
著者: Han, Donglin
Uda, Tetsuya
著者名の別形: 韓, 東麟
宇田, 哲也
キーワード: anomalous dispersion effect
barium zirconate
fuel cell
proton conductor
site occupancy
発行日: 30-Jan-2019
出版者: American Chemical Society
誌名: ACS Applied Materials & Interfaces
巻: 11
号: 4
開始ページ: 3990
終了ページ: 4000
抄録: Y-doped BaZrO3 (BZY) has high proton conductivity and is a promising electrolyte candidate for fuel cells and electrolytic cells at an intermediate temperature range. However, the conductivity of BZY has a large discrepancy in the literature. In particular, for BaZr0.9Y0.1O3−δ (BZY10), the reported bulk conductivity varies in the range of more than 2 orders of magnitude. With the aim of revealing the reason, in this work, we conducted synchrotron radiation X-ray diffraction analysis on a BZY10. The X-ray was adjusted to 17.027 keV to approach the Y-K absorption edge (17.037 keV), and the anomalous dispersion effect was thereby activated for a precise distinction between Zr and Y. High-resolution scanning transmission electron microscopy observation and electrochemical measurements were also performed. Assisted by these experimental results, Rietveld refinement with greatly improved quality was thereby available to generate precise information on both the phase behavior and crystal structure. The results revealed that the BZY10 samples after sintering at 1600 °C for 8 to 200 h have a bimodal microstructure. They were not single phases, but mixtures of two perovskite phases differing slightly in Y contents. The Y contents in the two phases after sintering for 8 h were about 12.3 and 8.7 mol %, respectively, and finally became 10.6 and 9.2 mol %, respectively, after sintering for 200 h. In addition, the partition of Y over both the Ba and Zr sites was not suggested, although small Ba-deficiency around 0.05 formed in the sample sintered for 40 h or longer. But notably, the formation of the Ba vacancies is reasonably believed as the possible reason for the decrease in bulk and also grain boundary conductivities.
著作権等: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsami.8b19576.
The full-text file will be made open to the public on 8 January 2020 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/236377
DOI(出版社版): 10.1021/acsami.8b19576
PubMed ID: 30620169
出現コレクション:学術雑誌掲載論文等

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