Room temperature phase transition in CeO2 nanocrystalline films

Anna Kossoy, Jaya P. Nair, Ellen Wachtel, Igor Lubomirsky, Juergen Fleig, Joachim Maier

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The temporal evolution of the lattice parameter of oxygen deficient nanocrystalline cerium oxide films was monitored by X-ray diffraction. It was found that films with lattice parameter of ≈ 5.47 {Å} upon deposition undergo large spontaneous expansion, in which the size of the unit cell increases by ≈ 0.7% during the course of days. The films with as-deposited lattice parameter larger or smaller than ≈ 5.47 Å do not show significant changes. This behavior is consistent with the previously suggested hypothesis of an order-disorder transition of oxygen vacancies and can be viewed as its direct experimental confirmation.

Original languageEnglish
Pages (from-to)605-608
Number of pages4
JournalJournal of Electroceramics
Volume13
Issue number1-3
DOIs
Publication statusPublished - Jul 1 2004

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Keywords

  • Cerium oxide
  • Diffusion
  • Mechanical stress
  • Nanocrystalline ceramics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

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