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

^*この研究の対応する著者

研究成果: Article › 査読

118 被引用数 (Scopus)

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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.

本文言語	English
ページ（範囲）	1448-1453
ページ数	6
ジャーナル	Journal of Materials Chemistry
巻	14
号	9
DOI	https://doi.org/10.1039/b400181h
出版ステータス	Published - 2004 5月 7
外部発表	はい

ASJC Scopus subject areas

物理化学および理論化学
材料化学
材料科学（全般）

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@article{e7530e6f81fa44fcac286bad49391c94,

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",

year = "2004",

month = may,

day = "7",

doi = "10.1039/b400181h",

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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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JF - Journal of Materials Chemistry

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

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