Preparation of a reduced layered tungstic acid HxW 2O7 via acid treatment of Bi2W 2O9 in the presence of Sn2+ ions

Seiichi Tahara*, Takakazu Minato, Nobuhiro Kumada, Shigenobu Hayashi, Yoshiyuki Sugahara

*この研究の対応する著者

研究成果: Conference article査読

1 被引用数 (Scopus)

抄録

A reduced layered tungstic acid with a double-octahedral structure was prepared by acid treatment of Aurivillius-type Bi2W2O 9 in the presence of Sn2+ ions. While the color of the product formed by acid treatment with no Sn2+ ions present, H2W2O7, was yellow, a blue powder was obtained after the acid treatment in the presence of Sn2+ ions. No notable change in the morphology was observed after acid treatment. The X-ray diffraction pattern of the product acid-treated in the presence of Sn2+ ions was very similar to that of H 2W2O7. Essentially all the Bi3+ ions were lost upon acid treatment, indicating the occurrence of selective leaching of bismuth oxide sheets in Bi2W2O9. A UV-visible absorption spectrum and XPS analysis demonstrated that the W 6+ ions were partially reduced to W5+ ions, and the number of protons in the product was correspondingly 2.4 per [W2O 7]. These results suggest the successful formation of a reduced layered tungstic acid, H2.4W2O7.

本文言語English
ページ(範囲)246-251
ページ数6
ジャーナルMaterials Research Society Symposium Proceedings
1056
出版ステータスPublished - 2008 12月 1
イベントNanophase and Nanocomposite Materials V - Boston, MA, United States
継続期間: 2007 11月 262007 11月 30

ASJC Scopus subject areas

  • 材料科学一般
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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