Enthalpy of formation of the cubic fluorite phase in the ceria-zirconia system

Theresa A. Lee, Christopher R. Stanek, Kenneth J. McClellan, Jeremy N. Mitchell, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The enthalpy of formation of cubic ceria-zirconia solid solutions (c-Ce(1-x)ZrxO2, 0.05 ≤ × ≤ 0.75) at 25°C with respect to monoclinic zirconia (m-ZrO2) and cubic ceria (c-CeO2) has been measured by high-temperature oxide melt solution calorimetry. In contrast to fluorite solid solutions containing trivalent oxides (e.g., yttria-zirconia), mixing in c-Ce1-xZrxO2 shows moderate positive deviation from ideality. Evaluating the data within the framework of a regular solution model, the interaction parameter, Ω, is +51.0 ± 8.0 kJ/mol. The introduction of undersized Zr into CeO2 severely distorts and destabilizes the oxygen sublattice. Destabilization of c-Ce1-xZrxO2 may be relieved by reduction or clustering. A stable ordered compound in the CeO2-ZrO2 system is thermodynamically unlikely.

Original languageEnglish (US)
Pages (from-to)1105-1112
Number of pages8
JournalJournal of Materials Research
Volume23
Issue number4
DOIs
StatePublished - Apr 2008
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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