Transport Properties and Thermal Expansion of SrCe(Y)O3-δ Ceramics
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.
Paula Maria Vilarinho
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