Physics – Condensed Matter – Materials Science
Scientific paper
2002-06-06
Physics
Condensed Matter
Materials Science
19 pages, 6 figures. To be published in J. Am. Ceram. Soc
Scientific paper
The microscopic mechanism leading to stabilization of cubic and tetragonal forms of zirconia (ZrO$_2$) is analyzed by means of a self-consistent tight-binding model. Using this model, energies and structures of zirconia containing different vacancy concentrations are calculated, equivalent in concentration to the charge compensating vacancies associated with dissolved yttria (Y$_2$O$_3$) in the tetragonal and cubic phase fields (3.2 and 14.4% mol respectively). The model is shown to predict the large relaxations around an oxygen vacancy, and the clustering of vacancies along the $<111 >$ directions, in good agreement with experiments and first principles calculations. The vacancies alone are shown to explain the stabilization of cubic zirconia, and the mechanism is analyzed.
Fabris Stefano
Finnis Michael W.
Paxton Anthony T.
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