A New Class of Pyrochlore Solid Solution formed by the Chemical Intercalation of Oxygen

Peter George Bruce, JB Thomson, AR Armstrong

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

Oxygen intercalation into a pyrochlore at room temperature is reported. A simple chemical route was employed. Previously only perovskite or a few closely related phase have demonstrated an ability to act as hosts for such intercalation. The specific system studied was the interstitial solid solution Ce2Zr2O7+x (0 less than or equal to x less than or equal to 0.36). Neutron diffraction reveals that interstitial oxygen enters the tetrahedral 8b sites (space group <Fd(3)over bar m>), which are empty in stoichiometric pyrochlore, but displacement of existing oxygen from the tetrahedral 8a sites also occurs. The lattice contracts on intercalation due to oxidation of Ce3+. The changes in structure and the diffusion pathways for oxygen are discussed.

Original languageEnglish
Pages (from-to)11129-11133
Number of pages5
JournalJournal of the American Chemical Society
Volume118
Publication statusPublished - 13 Nov 1996

Keywords

  • ELECTROCHEMICAL OXIDATION
  • INSERTION
  • TRANSITION
  • LA2CUO4

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