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The role of microstructure and processing on the proton conducting properties of gadolinium-doped barium cerate

Published online by Cambridge University Press:  31 January 2011

Sossina M. Haile ,
David L. West  and
John Campbell
Sossina M. Haile*
Affiliation:
Department of Material Science, California Institute of Technology, Pasadena, California 91125
David L. West
Affiliation:
Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195–2120
John Campbell
Affiliation:
Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195–2120
*
a) Author to whom correspondence should be addressed.
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Abstract

The influence of grain boundary conductivity and microstructure on the electrical properties of BaCe0.85Gd0.15O3–δ have been examined. Grain sizes were varied by sintering at various temperatures. Impedance data were analyzed using the brick layer model, and some new consequences of this model are presented. The specific grain boundary conductivity exhibits an activation energy of ~0.7 eV, and for similar processing routes, is independent of grain size. An isotope effect was observed, indicating that protons (or deuterons) are the mobile species. TEM investigations showed the intergranular regions to be free of any glassy phase that could account for the differences in bulk and grain boundary properties. Single-crystal fibers, grown by a modified float zone process, were notably barium deficient, and exhibited a low conductivity, comparable to that of polycrystalline Ba0.96Ce0.85Gd0.15O3–δ.

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Articles
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Journal of Materials Research , Volume 13 , Issue 6 , June 1998 , pp. 1576 - 1595
Copyright
Copyright © Materials Research Society 1998

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