The theoretical models that might be used to forecast the electrical behavi
our of ionic conductor composites for application in SOFCs are reviewed. A
comparison of the different models is performed and comparative analysis of
their power is presented on the basis of a case simulation (YSZ (7,54 mol%
Y2O3)-Al2O3 (5 wt%) composite). The lack of systematic experimental works m
akes a wide comparison with the theoretical results very difficult, so the
real power of the models can not yet be fully assessed and only introductor
y considerations are tentatively given. Nevertheless from the preliminary r
esults, it seems possible to affirm that Electrical Network Models are able
to better sustain the simulation of the electrical properties of YSZ-Al2O3
composites. Certainly many other improvements have to be done before ENMs
became confident tools for tailoring "ab initio" the electrical properties
of two phase mixtures. (C) 2001 Kluwer Academic Publishers.