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Microstructure-Conductivity Relationships in Solid Anisotropic Ionically Conducting Materials

Published online by Cambridge University Press:  16 February 2011

E. Butchereit ,
J. Schoonman ,
H. W. Zandbergen ,
C. Lutz-Elsner ,
M. Schreiber  and
P. Wang
E. Butchereit
Affiliation:
Laboratory for Applied Inorganic Chemistry, Delft University of Technology, P.O. Box 5045, 2600 GA Delft, The Netherlands
J. Schoonman
Affiliation:
Laboratory for Applied Inorganic Chemistry, Delft University of Technology, P.O. Box 5045, 2600 GA Delft, The Netherlands
H. W. Zandbergen
Affiliation:
Laboratory of Materials Science, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands
C. Lutz-Elsner
Affiliation:
Materials Research Laboratory, Daimler Benz AG, Wilhelm-Runge-StraBe 11, 89081 Ulm, Germany
M. Schreiber
Affiliation:
Materials Research Laboratory, Daimler Benz AG, Wilhelm-Runge-StraBe 11, 89081 Ulm, Germany
P. Wang
Affiliation:
Materials Research Laboratory, Daimler Benz AG, Wilhelm-Runge-StraBe 11, 89081 Ulm, Germany
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Abstract

In a randomly oriented polycrystalline ionically conducting material the total conductivity is reduced by the lengthening of the effective conduction pathway which is determined by the microstructure. It is, therefore, desirable to develop a better understanding of the relationship between the conductivity and the microstructure of the ceramic material.

This work focused on the quantification of the various contributions to the overall conductivity. Na-β” alumina ceramics with different microstructures but the same chemical composition were used as samples. Conductivity data were obtained by impedance spectroscopy measurements (IS) carried out in a temperature range from 350 to -30 °C at frequencies from 1 Hz to 500 KHz. An attempt has been made to calculate distinct geometric factors for the specific values of the grain and grain boundary contribution. These were inferred from the sample geometry, Laser Scanning Microscope (LSM) pictures, microstructural observations by image analysis, Transmission Electron Microscope (TEM) pictures, and considerations of the current pathways in the anisotropically conducting ceramic.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 369: Symposium U – Solid State Ionics IV , 1994 , 433
Copyright
Copyright © Materials Research Society 1995

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References

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