Direct synthesis of powdery inorganic electride [Ca24Al 28O64]4+ (e-)4 and determination of oxygen stoichiometry

Satoru Matsuishi, Takatoshi Nomura, Masahiro Hirano, Katsuaki Kodama, Shin ichi Shamoto, Hideo Hosono

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

Abstract

A direct synthesis method for the preparation of the Ca12A 14O33 crystal (C12A7) electride powder with the electron density up to 2.33 × 1021 cm-3 is reported. The crystals were synthesized by a reaction of C12A7, CaO· Al 2O3 (CA), and a metal at 700-1100°C. Rietved refinement using program TOPAS3 reveal that the calculated pattern for C12A7 framework structure without the free oxygen ions is well-fitted to the observed pattern. Additional weight loss observed above 775°C and integrated net weight gain from 300 to 1350°C is determined to be 1.20%, which is close to the theoretical one due to the oxidation of C12A7 electride to form stoichiometric C12A7. Absorption spectra of C12A7 powders show that the absorption band is centered at 2-4 eV and is associated with s-p transition of the electron bound to the cage.

Original languageEnglish
Pages (from-to)2589-2591
Number of pages3
JournalChemistry of Materials
Volume21
Issue number13
DOIs
Publication statusPublished - 2009 Jul 14

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry

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