Effect of stability and diffusivity of extra-framework oxygen species on the formation of oxygen radicals in 12CaO-7Al2O3

Katsuro Hayashi, Naoto Ueda, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The thermodynamics and kinetics of oxygen radical formation process in a nanoporous crystal, 12CaO-7Al2O3, were examined by isothermal annealing experiments in dry atmospheres. It is clarified that the formation of oxygen radicals, O-2 and O-, in the crystal occurs in the following three steps; outward diffusion of extra-framework oxide ions, its oxidation by absorbed oxygen molecules to form O- and O-2 at the surface, and subsequent inward diffusion of the oxygen radicals. The instability of the extra-framework oxide ions is essentially the driving force for the process. Further, the analyses allow to predict the total oxygen radical content for a given annealing condition.

Original languageEnglish
Pages (from-to)89-94
Number of pages6
JournalSolid State Ionics
Volume173
Issue number1-4 SPEC. ISS.
DOIs
Publication statusPublished - Sep 30 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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