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Modelling Study on the Electrical Behaviour of YSZ-BASED Composites

Published online by Cambridge University Press:  10 February 2011

G. Dotelli ,
F. Casartelli ,
I. Natali Sora ,
C. Schmid  and
C. M. Mari
G. Dotelli
Affiliation:
Department of Industrial Chemistry and Chemical Engineering, Polytechnic of Milan, Piazza L. da Vinci 32, 20133 Milano, Italy, gdotelli@ipmch12.chin.polimi.it
F. Casartelli
Affiliation:
Department of Industrial Chemistry and Chemical Engineering, Polytechnic of Milan, Piazza L. da Vinci 32, 20133 Milano, Italy, gdotelli@ipmch12.chin.polimi.it
I. Natali Sora
Affiliation:
INFM and Department of Mechanical Engineering, University of Brescia, via Valotti 9, 25123 Brescia, Italy
C. Schmid
Affiliation:
INFM and Department of Mechanical Engineering, University of Brescia, via Valotti 9, 25123 Brescia, Italy
C. M. Mari
Affiliation:
Department of Materials Science, University of Milano “Bicocca”, via R.Cozzi 53, 20125 Milano, Italy
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Abstract

Electrical properties of yttria-stabilised zirconia/alumina (YSZ/AI2O3) composites were tentatively foreseen by simulating their complex impedance spectra. A digital image-based model was developed to describe the electrical conduction process in polycrystalline mono- or multi-phase materials. The microstructure of each polycrystalline sample was reconstructed using the Voronoi tessellation technique (in fact, ad hoc modifications with respect to the original algorithm were introduced) and it was then converted into a threedimensional electrical network according to a set of well-defined rules. The network was solved via an iterative procedure for different frequency values and successively the Nyquist plot generated The complex impedance spectra of different composites were simulated considering the alumina content (5,10 and 15 %wt) as a parameter; both the bulk and grain boundary electrical conductivity were calculated and the Arrhenius plots obtained. Experimental and simulated results were compared and discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 575: Symposium CC – New Materials for Batteries & Fuel Cells , 1999 , 331
Copyright
Copyright © Materials Research Society 2000

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References

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