Low Temperature Oxygen Transport in Nonstoichiometric CeO2

  • S. P. Ray
  • A. S. Nowick
Part of the Materials Science Research book series (MSR, volume 9)


The dioxides of the f luorite structure are known to have oxygen-ion nobilities which are much greater than the cation mobilities, due to the relative ease of incorporation of oxygen vacancies [1–3]. The oxides of Ce, Pr and Tb are of special interest, since they show gross nonstoichiometric behavior ranging between the sesquioxide R2O3 (where R = Ce, Pr or Tb) and the dioxide RO2. In each of these systems the nonstoichiometric defects are believed to be oxygen vacancies. At a high enough temperature, the vacancies exist essentially at random in an otherwise perfectly ordered fluorite lattice. However, at a lower temperature (T < 500°C), a series of intermediate phases are found to occur, in which the vacancies are ordered and the symmetry of the crystal is lowered. A homologous series of the general formula Rn°2n-2 iias been proposed for these structures, mainly through studies on PrOy, where a number of such phases are observed [4–6].


Oxygen Vacancy Initial Slope Cerium Oxide Chemical Diffusion Fluorite Structure 
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Copyright information

© Plenum Press, New York 1975

Authors and Affiliations

  • S. P. Ray
    • 1
  • A. S. Nowick
    • 1
  1. 1.Henry Krumb School of MinesColumbia UniversityNew YorkUSA

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