Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 36, Issue 8, Pages 1983-1994Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2016.02.025
Keywords
Oxygen ion conductor; Ionic conductivity; Finite element method; Grain boundary; Space charge
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Funding
- Fund for Scientific Research Flanders (FWO-Vlaanderen) [FWOAL625]
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The ionic conductivity of doped ceria is strongly influenced by temperature, oxygen partial pressure, dopant concentration and microstructure of the material. While theory and experiments generally agree on the influence of the first two parameters, the other influences are still not fully understood. A reliable simulation model of the material's electrical conductivity is thus necessary to interpret the existing measurements. Until now, prediction of the electrical conductivity of these materials relies mainly on analytical models. This approach yields useful insights but it also has drawbacks. We implement the partial differential equations that govern charge carrier transport and electrical potential in a finite element model. This numerical approach enables us to treat grains of arbitrarily small size and to predict electrical conductivities at any applied current density. The results predicted by our model are compared to the available measurements in literature. (C) 2016 Elsevier Ltd. All rights reserved.
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