A stabilization mechanism of zirconia based on oxygen vacancies only

S. Fabris, Anthony Paxton, M.W. Finnis

Research output: Contribution to journalArticle

249 Citations (Scopus)

Abstract

The microscopic mechanism leading to stabilization of cubic and tetragonal forms of zirconia (ZrO2) 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 (Y2O3) 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. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)5171-5178
Number of pages8
JournalActa Materialia
Volume50(20)
Issue number20
DOIs
Publication statusPublished - 03 Dec 2002

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys

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