Journal Articles Solid State Phenomena Year : 2005

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 sigma(gb) when the samples have clean grain boundaries, while sigma(gb) 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 sigma(gb).

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Dates and versions

hal-00114913 , version 1 (19-11-2006)

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A. Rizea, Raulot Jm, C. Petot, G. Petot-Ervas, G. Baldinozzi. Nanostructure, nanochemistry and grain boundary conductivity of yttria-doped zirconia. Solid State Phenomena, 2005, 106, pp.83-86. ⟨10.4028/www.scientific.net/SSP.106.83⟩. ⟨hal-00114913⟩
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