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

doi:10.1039/b400181h

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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119 Citations (Scopus)

Abstract

Sodium cobalt oxide bilayer-hydrate, Na_xCoO₂· 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 Na_0.343(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 language	English
Pages (from-to)	1448-1453
Number of pages	6
Journal	Journal of Materials Chemistry
Volume	14
Issue number	9
DOIs	https://doi.org/10.1039/b400181h
Publication status	Published - 2004 May 7

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title = "Chemical composition and crystal structure of superconducting sodium cobalt oxicle bilayer-hydrate",

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.",

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

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month = may,

day = "7",

doi = "10.1039/b400181h",

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TY - JOUR

T1 - Chemical composition and crystal structure of superconducting sodium cobalt oxicle bilayer-hydrate

AU - Takada, Kazunori

AU - Fukuda, Katsutoshi

AU - Osada, Minoru

AU - Nakai, Izumi

AU - Izumi, Fujio

AU - Dilanian, Ruben A.

AU - Kato, Kenichi

AU - Takata, Masaki

AU - Sakurai, Hiroya

AU - Takayama-Muromachi, Eiji

AU - Sasaki, Takayoshi

PY - 2004/5/7

Y1 - 2004/5/7

N2 - 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.

AB - 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.

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DO - 10.1039/b400181h

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JO - Journal of Materials Chemistry

JF - Journal of Materials Chemistry

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ER -

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

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