Paper Title:
Transport Properties and Thermal Expansion of SrCe(Y)O3-δ Ceramics
  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.

  Info
Periodical
Materials Science Forum (Volumes 514-516)
Edited by
Paula Maria Vilarinho
Pages
387-391
DOI
10.4028/www.scientific.net/MSF.514-516.387
Citation
I. P. Marozau, V. V. Kharton, J. R. Frade, F. M.B. Marques, "Transport Properties and Thermal Expansion of SrCe(Y)O3-δ Ceramics", Materials Science Forum, Vols. 514-516, pp. 387-391, 2006
Online since
May 2006
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$32.00
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