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Decomposition of the ZrO2 electrolyte in contact with Ni: Structure and chemical composition of the Ni–electrolyte interface

Published online by Cambridge University Press:  31 January 2011

Thomas Wagner ,
Gerd Duscher  and
R. Kirchheim
Thomas Wagner
Affiliation:
Max-Planck-Institut für Metallforschung, D-70174 Stuttgart, Germany
Gerd Duscher
Affiliation:
Max-Planck-Institut für Metallforschung, D-70174 Stuttgart, Germany
R. Kirchheim
Affiliation:
Universität Göttingen, Institut Für Materialphysile, D-37073 Göttingen, Germany
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Abstract

The Ni/(ZrO2 + 9.5 mol% Y2O3) interface was used as a model system to investigate decomposition reactions of a yttria-stabilized ZrO2 electrolyte in contact with a metal at elevated temperature. In the present study, the sample was a diffusion-bonded symmetrical galvanic cell Ni‌ZrO2 + 9.5 mol% Y2O3‌Ni. Various electron microscopy techniques were used to study the morphology and structure of the reaction products at the Ni–ZrO2 electrolyte phase boundary after current flow. Below a critical oxygen partial pressure of approximately 10−27 atm, an intermetallic reaction layer formed at the Ni–electrolyte interface. Between the intermetallic layer and electrolyte a thin Y2O3 layer was present, which acted as a diffusion barrier for Zr and Ni, slowing down the overall chemical reaction. At several locations at the interface the Y2O3 layer broke up, leading to a morphological instability of the interface between electrolyte and Ni5Zr, allowing further reaction. The thickness of the total reaction layer varied widely as a consequence of such an instability.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 8 , August 1999 , pp. 3340 - 3345
Copyright
Copyright © Materials Research Society 1999

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References

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