Nanostructure, Nanochemistry and Grain Boundary Conductivity of Yttria-Doped Zirconia

Abstract:

This work was directed at a comprehensive study of the role of the nanostructure and nanochemistry on the transport properties of yttria-stabilized zirconia. Alumina additions lead to a decrease of sgb when the samples have clean grain boundaries, while sgb goes through a maximum in samples having glassy grain boundaries. The differences were attributed to the strong interaction between Al2O3 and SiO2 impurities leading to a glassy phase depletion at the grain-boundaries, due to a change in wettability. Moreover, XPS analyses show that Si and Y segregate near these interfaces according to a kinetic demixing process, explaining why a faster cooling rate after sintering has a beneficial effect on sgb.

• Periodical: Solid State Phenomena (Volume 106)
• Pages: 83-86
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.106.83
• Online since: September 2005
• Authors: A. Rizea, Jean Marc Raulot, C. Petot, Georgette Petot-Ervas, Gianguido Baldinozzi
• Keywords: Ionic Conductivity, Nanostructured Materials, Transport Property

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