Phase formation and thermal stability of fcc (fluorite) Ce1-xTbxO2-δ solid solutions

K.J. de Vries, G.Y. Meng

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12 Citations (Scopus)

Abstract

Ce1−xTbxO2−δ solid solutions (x = 0.3, 0.4, and 0.5) were synthesized by a coprecipitation method, using ammonia. The formation process of the solid solutions was studied as a function of temperature up to 1200°C by X-ray diffraction, thermogravimetric analysis, and differential scanning calorimetry. The results showed that chemically homogeneous, oxidic fcc structures were formed. The large increase (∼1.5%) of the fcc unit-cell parameter on increase of temperature in ambients of oxygen or nitrogen could be correlated with changes in the oxygen stoichiometry (≈3.5%) that have led to a reversible change in the valence state from (IV) to (III) of a fraction of the Ce and Tb ions. The fcc structure was chemically and structurally stable to at least 1200°C.
Original languageEnglish
Pages (from-to)357-367
Number of pages11
JournalMaterials research bulletin
Volume33
Issue number3
DOIs
Publication statusPublished - 1998

Keywords

  • Thermogravimetric analysis
  • X-Ray diffraction
  • Ceramics
  • Phase equilibria
  • Differential scanning calorimetry (DSC)

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