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

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


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.

Original languageEnglish
Pages (from-to)246-251
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Publication statusPublished - 2008 Dec 1
EventNanophase and Nanocomposite Materials V - Boston, MA, United States
Duration: 2007 Nov 262007 Nov 30

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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