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

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

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Abstract

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.

Original languageEnglish
Pages (from-to)1448-1453
Number of pages6
JournalJournal of Materials Chemistry
Volume14
Issue number9
DOIs
Publication statusPublished - 2004 May 7
Externally publishedYes

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Materials Science(all)

Cite this

Takada, K., Fukuda, K., Osada, M., Nakai, I., Izumi, F., Dilanian, R. A., Kato, K., Takata, M., Sakurai, H., Takayama-Muromachi, E., & Sasaki, T. (2004). Chemical composition and crystal structure of superconducting sodium cobalt oxicle bilayer-hydrate. Journal of Materials Chemistry, 14(9), 1448-1453. https://doi.org/10.1039/b400181h