期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 39, 期 13, 页码 7100-7108出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2014.02.072
关键词
Proton-conducting oxide; Barium evaporation; Y2O3 segregation; Phase stability; Electrical conductivity
资金
- Fusion Research Program for Green Technologies through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2011-0019297]
- KIST
- National Research Foundation of Korea [2011-0019297] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The phase stability and electrical conductivity of a proton-conducting oxide, Ba(Zr0.84Y0.15Cu0.01)O3-delta (BZYCu), sintered under various atmospheres was systematically investigated. The partial pressures of oxygen (Po-2) and barium (P-Ba) were used as the tunable experimental parameters to control the surrounding atmosphere during sintering. According to the analysis, the potentially volatile species BaCO3, formed by the decomposition of BZYCu under a CO2-containing atmosphere at around 600 degrees C, was found to induce barium losses by evaporation. These barium losses, and the associated Y2O3 segregation, were the decisive factor in determining the phase stability and electrical conductivity of the resulting BZYCu; both of these properties deteriorated with barium evaporation. Maintaining the optimum balance of Po-2, and P-Ba during sintering is crucial for minimizing Y2O3 segregation by kinetically suppressing the volatilization of barium. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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