Oxygen ion conduction in 12CaO·7Al2O3: O2- conduction mechanism and possibility of O- fast conduction

Hideo Hosono, Katsuro Hayashi, Koichi Kajihara, Peter V. Sushko, Alexander L. Shluger

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

12CaO·7Al2O3 (C12A7) with a unique nano-porous structure and free O2- ions entrapped in sub-nanometer-sized cages is a fast oxygen-ion-conducting material. These free O2- may be replaced by various oxygen-related species, OH-, O2- and O-, by tuning the atmosphere during the heat treatment. We examined the conduction mechanism for stoichiometric C12A7 (C12A7:O2-), in which O2- ions exist as counter anions in sub-nanometer-sized cages, by Raman measurement of C12A7:O2- annealed in a dry 18O2 atmosphere. It was revealed that the primary ion conducting species is an O2- ion which diffuses via exchange with O2- in the cage wall. An experimental result on the sample containing O- ions implied that O- is more mobile than O2- in C12A7. Ab initio calculations on the diffusion paths of O2- and O- ions in C12A7 supported the above experimental results.

Original languageEnglish
Pages (from-to)550-555
Number of pages6
JournalSolid State Ionics
Volume180
Issue number6-8
DOIs
Publication statusPublished - May 14 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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