Nonstoichiometry of Ce1-XYXO 2-0.5X-δ (X=0.1, 0.2)

T. Otake, H. Yugami, K. Yashiro, Y. Nigara, T. Kawada, J. Mizusaki

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54 Citations (Scopus)

Abstract

Nonstoichiometry of the fluorite-type oxide solid solutions Ce 1-XYXO2-0.5X-δ (X=0.1, 0.2) was measured as a function of temperature (T=973-1373 K) and oxygen partial pressure (P(O2)=10-2-10-24 atm) by means of thermogravimetry. The result shows that the nonstoichiometry of Ce 1-XYXO2-0.5X-δ (X=0.1, 0.2) is not explained by a simple point defect model, therefore, defect association models are suggested. From the calculation, it is found that (Ce′ CeVÖCe′Ce)x is the major defect association not only in Ce1-XYXO 2-0.5X-δ (X=0.1, 0.2), but also in pure CeO2 for nonstoichiometries less than 0.10. It is also found that the defect association (Ce′CeVÖCe′Ce)x is dominating at lower temperature and smaller X composition.

Original languageEnglish
Pages (from-to)181-186
Number of pages6
JournalSolid State Ionics
Volume161
Issue number1-2
DOIs
Publication statusPublished - 2003 Jul 1

Keywords

  • CeO-YO
  • Chemical compound
  • Defect association
  • Doped-ceria
  • Nonstoichiometry
  • Thermogravimetry
  • YDC

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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