Excess oxygen in 12CaO·7Al2O3 studied by thermogravimetric analysis

Katsuro Hayashi, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


Oxygen radial (O2-, O-)-accommodated 12CaO·7Al2O3 (CI2A7) releases oxygen molecules at about 800 C when heated in helium. The corresponding weight loss nearly accords with that calculated from an amount of the accommodated radicals, providing solid evidence that they are formed by an oxygen gas uptake from the atmosphere. Small difference between the observed and calculated losses suggests the presence of peroxide ion, O22-, which is confirmed by the enhancement of 770 cm-1 band in Raman spectra of the radical-accommodated samples.

Original languageEnglish
Pages (from-to)586-587
Number of pages2
JournalChemistry Letters
Issue number4
Publication statusPublished - Apr 5 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)


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