Hexagonal tungsten trioxide obtained from peroxo-polytungstate and reversible lithium electro-intercalation into its framework

Junko Oi, Akira Kishimoto, Tetsuichi Kudo, Masahiko Hiratani

Research output: Contribution to journalArticle

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Abstract

A hexagonal form of WO3 (a = 7.3244(6), c = 7.6628(5), Å, z = 6) was synthesized by the low temperature sintering of an ammonium peroxo-polytungstate precursor. This compound, the N/W ratio of which is 0.015 at most, is not identical to reported hexagonal WO3 from WO3 ·1/3H2O because its c-axis is significantly shorter than that of the latter (7.798 Å). Powder, XRD profile refinements were performed in the space group P63/mcm. We found two kinds of structural models that showed reasonably good profile agreement (R0.07). Both models are built up of remarkably distorted WO6 octahedra, in which part of the O-O distances are very short (2.32 ≈ 2.42, Å). Electrochemical intercalation of lithium into the present WO3 framework was investigated using a Li|LiPF6|WO3 cell. It was found that Li was intercalated reversibly up to the composition Li1.0WO3.

Original languageEnglish
Pages (from-to)13-19
Number of pages7
JournalJournal of Solid State Chemistry
Volume96
Issue number1
DOIs
Publication statusPublished - 1992
Externally publishedYes

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Intercalation
Lithium
intercalation
Tungsten
tungsten
lithium
profiles
Ammonium Compounds
Powders
sintering
Sintering
cells
Chemical analysis
Temperature
tungsten oxide

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Hexagonal tungsten trioxide obtained from peroxo-polytungstate and reversible lithium electro-intercalation into its framework. / Oi, Junko; Kishimoto, Akira; Kudo, Tetsuichi; Hiratani, Masahiko.

In: Journal of Solid State Chemistry, Vol. 96, No. 1, 1992, p. 13-19.

Research output: Contribution to journalArticle

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abstract = "A hexagonal form of WO3 (a = 7.3244(6), c = 7.6628(5), {\AA}, z = 6) was synthesized by the low temperature sintering of an ammonium peroxo-polytungstate precursor. This compound, the N/W ratio of which is 0.015 at most, is not identical to reported hexagonal WO3 from WO3 ·1/3H2O because its c-axis is significantly shorter than that of the latter (7.798 {\AA}). Powder, XRD profile refinements were performed in the space group P63/mcm. We found two kinds of structural models that showed reasonably good profile agreement (R0.07). Both models are built up of remarkably distorted WO6 octahedra, in which part of the O-O distances are very short (2.32 ≈ 2.42, {\AA}). Electrochemical intercalation of lithium into the present WO3 framework was investigated using a Li|LiPF6|WO3 cell. It was found that Li was intercalated reversibly up to the composition Li1.0WO3.",
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AB - A hexagonal form of WO3 (a = 7.3244(6), c = 7.6628(5), Å, z = 6) was synthesized by the low temperature sintering of an ammonium peroxo-polytungstate precursor. This compound, the N/W ratio of which is 0.015 at most, is not identical to reported hexagonal WO3 from WO3 ·1/3H2O because its c-axis is significantly shorter than that of the latter (7.798 Å). Powder, XRD profile refinements were performed in the space group P63/mcm. We found two kinds of structural models that showed reasonably good profile agreement (R0.07). Both models are built up of remarkably distorted WO6 octahedra, in which part of the O-O distances are very short (2.32 ≈ 2.42, Å). Electrochemical intercalation of lithium into the present WO3 framework was investigated using a Li|LiPF6|WO3 cell. It was found that Li was intercalated reversibly up to the composition Li1.0WO3.

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