MISC

2004年5月7日

Chemical composition and crystal structure of superconducting sodium cobalt oxicle bilayer-hydrate

Journal of Materials Chemistry
  • Kazunori Takada
  • ,
  • Katsutoshi Fukuda
  • ,
  • Minoru Osada
  • ,
  • Izumi Nakai
  • ,
  • Fujio Izumi
  • ,
  • Ruben A. Dilanian
  • ,
  • Kenichi Kato
  • ,
  • Masaki Takata
  • ,
  • Hiroya Sakurai
  • ,
  • Eiji Takayama-Muromachi
  • ,
  • Takayoshi Sasaki

14
開始ページ
1448
終了ページ
1453
DOI
10.1039/b400181h

Sodium cobalt oxide bilayer-hydrate, NaxCoO2· yH2O (x ≈ 0.35), was characterized by chemical and structure analyses. The formal valence of Co was found to be +3.4 from redox titration, which was much lower than +3.65 that had been estimated from the Na content, x. The deviation from the charge neutralization was considered to be compensated by the presence of oxonium ions in the CoO2 galleries, which was evidenced by Raman spectroscopy. Therefore, the composition of the superconducting phase was determined to be Na0.343(H 3O)0.237CoO2·1.19H2O. Structural studies based on Raman spectroscopy and synchrotron X-ray powder diffraction suggested that the oxonium ions occupy the same crystallographic sites as the Na+ ions.

リンク情報
DOI
https://doi.org/10.1039/b400181h
Scopus
https://www.scopus.com/record/display.uri?eid=2-s2.0-2542478994&origin=inward
URL
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=2542478994&origin=inward