Electronic transport in Ce0.8Sm0.2O1.9-delta ceramics under reducing conditions
authors Abrantes, JCC; Perez-Coll, D; Nunez, P; Frade, JR
nationality International
journal ELECTROCHIMICA ACTA
author keywords ceria-samaria; electronic conductivity; oxygen nonstoichiometry; polaron mobility
keywords OXIDE FUEL-CELLS; DOPED CERIA; ELECTRICAL-PROPERTIES; IONIC-CONDUCTIVITY; DIRECT OXIDATION; SOLID-SOLUTIONS; ELECTROLYTES; CEO2; NONSTOICHIOMETRY; TEMPERATURE
abstract Ce0.8Sm0.2O1.9-delta powders were prepared by a freeze drying method and used to obtain ceramic disks. These samples were used to study the electronic transport properties of this material. A Hebb-Wagner method was used to obtain the electronic conductivity under ion blocking conditions. Typical values of electronic conductivity measured for this material at 800 degreesC were about 0.37 S m(-1) at Po-2 = 10(-16) atm and 0.58 S m(-1) at Po-2 = 10(-18) atm. These values are significantly lower than results reported for ceria-based materials with different trivalent additives. A coulometric titration method was used to estimate the charge carrier concentrations, and the mobility of carriers was obtained on combining the results of conductivity and concentration. Typical values of mobility show weak temperature dependence and decrease with increasing oxygen deficiency, suggesting a limiting value of about 0.5 x 10(-7) m(2). V-1 s(-1) for relatively high delta. (C) 2003 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0013-4686
year published 2003
volume 48
issue 19
beginning page 2761
ending page 2766
digital object identifier (doi) 10.1016/S0013-4686(03)00395-5
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000184501200005
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