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Transport Properties and Thermal Expansion of SrCe(Y)O3-δ Ceramics

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Abstract:

Oxygen transport properties of perovskite-type SrCe1-xYxO3-δ (x = 0.05–0.10), exhibiting protonic transport in hydrogen-containing reducing atmospheres and mixed oxygen-ionic and ptype electronic conductivity at oxygen partial pressures close to atmospheric, were studied at 973– 1223 K under oxidizing conditions. The oxygen transference numbers of SrCe(Y)O3-δ in air vary in the range 0.37–0.80, decreasing when temperature increases. The oxygen permeability is significantly affected by the hole conduction, which influences both bulk ambipolar conductivity and surface exchange kinetics. The average thermal expansion coefficients of SrCe1-xYxO3-δ ceramics, calculated from dilatometric data in air, are (11.1–11.3)×10-6 K-1 at 373–1373 K.

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Advanced Materials Forum III View Preview

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Periodical:

Materials Science Forum (Volumes 514-516)

Pages:

387-391

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.514-516.387

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Online since:

May 2006

Authors:

Ivan P. Marozau, Vladislav V. Kharton, Jorge R. Frade, Fernando M.B. Marques

Keywords:

Faradaic Efficiency, Mixed Conductivity, Oxygen Permeation, Perovskite, Proton Transport, Strontium Cerate

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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