Sol‐Gel Process for the Preparation of Ba2Ti9O20 and BaTi5O11

Hsin‐chun ‐c Lu, Lawrence E. Burkhart, Glenn L Schrader

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Abstract

Barium titanate precursors with Ba/Ti ratio 2:9 and 1:5 were prepared by first hydrolyzing titanium alkoxide and then mixing the resulting titania sol with a barium alkoxide‐methanol solution. After drying, the xerogels of the precursors of barium titanates were sintered at temperatures from 700°C (4 h) to 1200°C (110 h or longer). Characterization of the product was performed using X‐ray diffraction and laser Raman spectroscopy. At 700°C, BaTi5O11 was formed from the 1:5 precursor and a two‐phase mixture of BaTi2O5 and BaTi5O11 was formed from the 2:9 precursor. After prolonged heating at 1200°C, the latter mixture converted to a single‐phase material, Ba2Ti9O20.

Original languageEnglish (US)
Pages (from-to)968-972
Number of pages5
JournalJournal of the American Ceramic Society
Volume74
Issue number5
DOIs
Publication statusPublished - 1991
Externally publishedYes

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Keywords

  • barium titanate
  • dielectric materials
  • precursors
  • processing
  • sol‐gels

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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