Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 205, Issue -, Pages 122-128Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2013.07.010
Keywords
Barium cerate; Perovskite; Proton conductor; Phase behavior; Hydration
Funding
- Innovation Promotion Project from the New Energy and Industrial Technology Development Organization (NEDO) of Japan [P07026]
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High temperature X-ray diffraction measurements were performed under dry and wet atmospheres to investigate phase behavior of BaCe0.8Y0.2O3-delta (BCY20). In the temperature range of 30-400 degrees C, BCY20 was identified to be rhombohedral and monoclinic structures in dry and wet atmospheres, respectively. Larger lattice volumes were obtained in a wet atmosphere due to a chemical expansion induced by water incorporation. A gradual change in diffraction peak shape due to a phase transformation from rhombohedral to monoclinic was observed at 300 degrees C when moisture was introduced into the atmosphere. These results indicated clearly the dependence of phase behavior of BCY20 on partial pressure of water vapor in atmosphere. (c) 2013 Elsevier Inc. All rights reserved.
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