Ionic and electronic conductivities, stability and thermal expansion of La10-x(Si,Al)(6)O-26 +/-delta solid electrolytes
authors Shaula, AL; Kharton, VV; Marques, FMB
nationality International
journal SOLID STATE IONICS
author keywords apatite; lanthanum silicate; ionic conductivity; electronic transport; thermal expansion
keywords OXIDE FUEL-CELLS; ELECTRICAL-CONDUCTIVITY; TRANSPORT
abstract Apatite-type La10-xSi6-yAlyO27-3x/2-y/2 (x=0-0.33; y=0.5-1.5) exhibit predominant oxygen ionic conductivity in a wide range of oxygen partial pressures. The conductivity of silicates containing 26.50-26.75 oxygen atoms per formula unit is comparable to that of gadolinia-doped ceria at 770-870 K. The average thermal expansion coefficients are (8.7-10.8) x 10(-6) K-1 at 373-1273 K. At temperatures above 1100 K, silicon oxide volatilization from the surface layers of apatite ceramics and a moderate degradation of the ionic transport with time are observed under reducing conditions, thus limiting the operation temperature of Si-containing solid electrolytes. (c) 2005 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0167-2738
year published 2006
volume 177
issue 19-25
beginning page 1725
ending page 1728
digital object identifier (doi) 10.1016/j.ssi.2005.11.023
web of science category Chemistry, Physical; Physics, Condensed Matter
subject category Chemistry; Physics
unique article identifier WOS:000242555200033
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journal impact factor 2.751
5 year journal impact factor 2.607
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