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Space-charge concepts on grain boundary impedance of a high-purity yttria-stabilized tetragonal zirconia polycrystal

Published online by Cambridge University Press:  31 January 2011

Jong-Sook Lee  and
Doh-Yeon Kim
Jong-Sook Lee*
Affiliation:
Center for Microstructure Science of Materials and School of Materials Science and Engineering, Seoul National University, Seoul 151–742, Korea
Doh-Yeon Kim
Affiliation:
Center for Microstructure Science of Materials and School of Materials Science and Engineering, Seoul National University, Seoul 151–742, Korea
*
a)Address correspondence to this author. Present address: National Institute of Standards and Technology, Gaithersburg, MD.
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Abstract

A detailed impedance analysis using the brick-layer model is performed on a high-purity yttria-stabilized tetragonal zirconia polycrystal (Y-TZP). Space-charge impedance is generally formulated and expressions for the respective space-charge models are therefrom derived depending on whether dopant ions are mobile or immobile. Pronounced yttrium segregation in Y-TZP is also considered in the analysis in that the dopant profile is assumed to be frozen from a high-temperature equilibrium distribution. Comparison with experimental observations shows that the electrically measured grain-boundary thickness corresponds to the Schottky-barrier width, slightly modified by the dopant segregation. The grain-boundary resistance is not consistent with any space-charge models and the strong defect interaction due to the yttrium enrichment is suggested to be mainly responsible.

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Articles
Information
Journal of Materials Research , Volume 16 , Issue 9 , September 2001 , pp. 2739 - 2751
Copyright
Copyright © Materials Research Society 2001

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