Journal
SOLID STATE IONICS
Volume 262, Issue -, Pages 870-874Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2013.12.044
Keywords
Proton conductor; Electrolyte surface; Bulk chemistry; Protonation; In situ Raman spectroscopy
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BaCe0.5Zr0.3Y0.16M0.04O3 (- delta) (BCZYZ) has been advocated as a potential high calibre proton conductor, offering the benefits of both stability and increased proton conductivity. In this work we examine the bulk and surface features of the ceramic in its protonated and unprotonated forms. Following protonation, under H2O pressure as low as 60 mbar, Ba rich surface features are observed at the grain boundary regions, where apparently H2O preferentially attacks. Such surface secondary phases are also noted in the Raman data following a higher pressure treatment of 10 bar, appearing into the sample bulk after 30 h at 500 degrees C. BCZYZ's stability towards steam is also discussed. (C) 2014 Elsevier B.V. All rights reserved.
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