Modulated Fluorite-Type Structure of Materials from the (1-x) Y0.5Zr0.5O1.75 - x Y0.75Nb0.25O1.75 (0£x£ 1) System

S García-Martín, MA Alario-Franco, DP Fagg, AJ Feighery, John Thomas Sirr Irvine

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

The microstructures of different high-temperature prepared oxides of the (1-x)Y0.5Zr0.5O1.75-xY(0.75)Nb(0.25)O(1.75) (0 less than or equal to x less than or equal to 1) system have been studied by selected-area electron diffraction and high-resolution transmission electron microscopy. The materials show a modulated fluorite-type structure mainly due to a partial or short-range ordering of the oxygen vacancies. The modulation is related to the pyrochlore-type structure in the Y0.75Nb0.25O1.75 A short-range ordering of the oxygen vacancies related to the C-type structure is observed in the Y0.5Zr0.5O1.75. Gradual transition from the pyrochlore to the C-type structures is established with the variation of the composition.

Original languageEnglish
Pages (from-to)1729-1737
Number of pages9
JournalChemistry of Materials
Volume12
DOIs
Publication statusPublished - Jun 2000

Keywords

  • YTTRIA-STABILIZED ZIRCONIA
  • MICRODOMAIN FORMATION
  • NEUTRON-DIFFRACTION
  • DIFFUSE-SCATTERING
  • CRYSTAL-CHEMISTRY
  • SOLID-SOLUTIONS
  • ELECTRON
  • PHASES
  • PYROCHLORE

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