Densification of yttria-stabilized zirconia impedance spectroscopy analysis

Yttria-stabilised-zirconia samples with fairly narrow pore size distributions give well-defined microstructure impedance semicircles which can be characterised by a blocking factor alphaR, a capacitance ratio alphaC, and a frequency ratio alphaF. On an alphaR vs alphaC diagram, the regimes where eit...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 1997, Vol.144 (1), p.390-398
Main Authors: STEIL, M. C, THEVENOT, F, KLEITZ, M
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Conductivity phenomena in semiconductors and insulators
Defects and impurities in crystals
microstructure
Dielectric properties of solids and liquids
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Electronic transport in condensed matter
Exact sciences and technology
Low-field transport and mobility
piezoresistance
Permittivity (dielectric function)
Physics
Structure of solids and liquids
crystallography
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Summary:Yttria-stabilised-zirconia samples with fairly narrow pore size distributions give well-defined microstructure impedance semicircles which can be characterised by a blocking factor alphaR, a capacitance ratio alphaC, and a frequency ratio alphaF. On an alphaR vs alphaC diagram, the regimes where either the pores or the grain boundaries are dominant are clearly separated. In this work, various features of the impedance (and admittance) diagrams of YSZ samples with variable porosities and also Al2O3/YSZ composites were examined in detail. The results, and in particular, the fact that the product alphaR alphaF is proportional to porosity support the previously developed block process model. Comparison of different results shows a remarkable constancy of the average thickness of the grain-boundary blockers in the samples sintered at high temperature. The electrical bulk properties obey simple laws as functions of porosity, which allows the authors to correct the conductivity and dielectric-constant data obtained with imperfectly densified materials. Details of the YSZ sample preparation and characterisation are also given. 21 refs.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.1837416