Finite element modelling of the ionic conductivity of acceptor doped ceria

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 understoo...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the European Ceramic Society 2016-07, Vol.36 (8), p.1983-1994
Main Authors: Van Laethem, Dries, Deconinck, Johan, Depla, Diederik, Hubin, Annick
Format: Article
Language:English
Subjects:
Finite element method
Grain boundary
Ionic conductivity
Oxygen ion conductor
Space charge
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2016.02.025